From nobody Mon Oct 6 19:07:10 2025 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 5C1CF20E704 for ; Thu, 17 Jul 2025 18:41:21 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=170.10.133.124 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1752777684; cv=none; b=Wy9NreTTYTqAwiLksncs0RkKyBp6c+c4RFwc71oUmp3j0KjnSFuuUU3fRhRTfiizTTlpn4jwQDyOb3DiFqoUYHPxn6U6nOnFVoxk299cwUFk8CxRLmjwZQsV2fZOkzmT+H+H2OqpDMo417e1rUUlk1G3gmtzXdfKA06kRvSp6fk= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1752777684; c=relaxed/simple; bh=MmhC7SLd7D2cNNs2RzqSTjzfObF2Q95WaeZYh//UXPc=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=GvQV9ZvZF/RBGx/pX+5YBp+st9ctexxyu3JtqBdWxxKtSmY8TC1sa05OvIyyUBSs5RkHL5gIN+jQ2FPK3mwGxAF9mj13/EblREMCE4kMnxVxBZq0gbKTh6tkLbACrrklUMXrNWL2Gqh/FwBQ4UgbhozfVQFJyPgkbLHkl7jwvU8= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=redhat.com; spf=pass smtp.mailfrom=redhat.com; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b=hpP0RQmW; arc=none smtp.client-ip=170.10.133.124 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=redhat.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=redhat.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="hpP0RQmW" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1752777680; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=OcgFbFVI/LC1amLcibi/tfhS+MHSmrXxILufaFDAAeY=; b=hpP0RQmW4Nl9/fMsorkQYxgdAifK4OT1HfCVSOkeijYxppk8T7pf9It7vqbsmK7QE+3OYb /MTJHYrvp1oO35fihXuvKWE/j+ZGGmHZ4SxbGQ8yxxHOdbrXZOEcKlWSRs01tv1Mro6Yez i8TrcpTTdLUAxp1kezT3hhd3SCqJ2ZU= Received: from mx-prod-mc-05.mail-002.prod.us-west-2.aws.redhat.com (ec2-54-186-198-63.us-west-2.compute.amazonaws.com [54.186.198.63]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-662-xv55bLYvPOCYmIQo0VaQLQ-1; Thu, 17 Jul 2025 14:41:17 -0400 X-MC-Unique: xv55bLYvPOCYmIQo0VaQLQ-1 X-Mimecast-MFC-AGG-ID: xv55bLYvPOCYmIQo0VaQLQ_1752777675 Received: from mx-prod-int-06.mail-002.prod.us-west-2.aws.redhat.com (mx-prod-int-06.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.93]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mx-prod-mc-05.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id F28B31956089; Thu, 17 Jul 2025 18:41:14 +0000 (UTC) Received: from chopper.redhat.com (unknown [10.22.66.69]) by mx-prod-int-06.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTP id 74178180045B; Thu, 17 Jul 2025 18:41:11 +0000 (UTC) From: Lyude Paul To: rust-for-linux@vger.kernel.org, Thomas Gleixner , Boqun Feng , linux-kernel@vger.kernel.org, Daniel Almeida Cc: Ingo Molnar , Peter Zijlstra , Juri Lelli , Vincent Guittot , Dietmar Eggemann , Steven Rostedt , Ben Segall , Mel Gorman , Valentin Schneider Subject: [PATCH v11 01/14] preempt: Introduce HARDIRQ_DISABLE_BITS Date: Thu, 17 Jul 2025 14:37:53 -0400 Message-ID: <20250717184055.2071216-2-lyude@redhat.com> In-Reply-To: <20250717184055.2071216-1-lyude@redhat.com> References: <20250717184055.2071216-1-lyude@redhat.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 3.4.1 on 10.30.177.93 Content-Type: text/plain; charset="utf-8" From: Boqun Feng In order to support preempt_disable()-like interrupt disabling, that is, using part of preempt_count() to track interrupt disabling nested level, change the preempt_count() layout to contain 8-bit HARDIRQ_DISABLE count. Note that HARDIRQ_BITS and NMI_BITS are reduced by 1 because of this, and it changes the maximum of their (hardirq and nmi) nesting level. Signed-off-by: Boqun Feng Signed-off-by: Lyude Paul --- include/linux/preempt.h | 16 +++++++++++----- 1 file changed, 11 insertions(+), 5 deletions(-) diff --git a/include/linux/preempt.h b/include/linux/preempt.h index b0af8d4ef6e66..809af7b57470a 100644 --- a/include/linux/preempt.h +++ b/include/linux/preempt.h @@ -17,6 +17,7 @@ * * - bits 0-7 are the preemption count (max preemption depth: 256) * - bits 8-15 are the softirq count (max # of softirqs: 256) + * - bits 16-23 are the hardirq disable count (max # of hardirq disable: 2= 56) * * The hardirq count could in theory be the same as the number of * interrupts in the system, but we run all interrupt handlers with @@ -26,29 +27,34 @@ * * PREEMPT_MASK: 0x000000ff * SOFTIRQ_MASK: 0x0000ff00 - * HARDIRQ_MASK: 0x000f0000 - * NMI_MASK: 0x00f00000 + * HARDIRQ_DISABLE_MASK: 0x00ff0000 + * HARDIRQ_MASK: 0x07000000 + * NMI_MASK: 0x38000000 * PREEMPT_NEED_RESCHED: 0x80000000 */ #define PREEMPT_BITS 8 #define SOFTIRQ_BITS 8 -#define HARDIRQ_BITS 4 -#define NMI_BITS 4 +#define HARDIRQ_DISABLE_BITS 8 +#define HARDIRQ_BITS 3 +#define NMI_BITS 3 =20 #define PREEMPT_SHIFT 0 #define SOFTIRQ_SHIFT (PREEMPT_SHIFT + PREEMPT_BITS) -#define HARDIRQ_SHIFT (SOFTIRQ_SHIFT + SOFTIRQ_BITS) +#define HARDIRQ_DISABLE_SHIFT (SOFTIRQ_SHIFT + SOFTIRQ_BITS) +#define HARDIRQ_SHIFT (HARDIRQ_DISABLE_SHIFT + HARDIRQ_DISABLE_BITS) #define NMI_SHIFT (HARDIRQ_SHIFT + HARDIRQ_BITS) =20 #define __IRQ_MASK(x) ((1UL << (x))-1) =20 #define PREEMPT_MASK (__IRQ_MASK(PREEMPT_BITS) << PREEMPT_SHIFT) #define SOFTIRQ_MASK (__IRQ_MASK(SOFTIRQ_BITS) << SOFTIRQ_SHIFT) +#define HARDIRQ_DISABLE_MASK (__IRQ_MASK(SOFTIRQ_BITS) << HARDIRQ_DISABLE_= SHIFT) #define HARDIRQ_MASK (__IRQ_MASK(HARDIRQ_BITS) << HARDIRQ_SHIFT) #define NMI_MASK (__IRQ_MASK(NMI_BITS) << NMI_SHIFT) =20 #define PREEMPT_OFFSET (1UL << PREEMPT_SHIFT) #define SOFTIRQ_OFFSET (1UL << SOFTIRQ_SHIFT) +#define HARDIRQ_DISABLE_OFFSET (1UL << HARDIRQ_DISABLE_SHIFT) #define HARDIRQ_OFFSET (1UL << HARDIRQ_SHIFT) #define NMI_OFFSET (1UL << NMI_SHIFT) =20 --=20 2.50.0 From nobody Mon Oct 6 19:07:10 2025 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 1DA8D213E85 for ; 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Peter Anvin" , Arnd Bergmann , Juergen Christ , Uros Bizjak , Brian Gerst , linux-arm-kernel@lists.infradead.org (moderated list:ARM64 PORT (AARCH64 ARCHITECTURE)), linux-s390@vger.kernel.org (open list:S390 ARCHITECTURE), linux-arch@vger.kernel.org (open list:GENERIC INCLUDE/ASM HEADER FILES) Subject: [PATCH v11 02/14] preempt: Introduce __preempt_count_{sub, add}_return() Date: Thu, 17 Jul 2025 14:37:54 -0400 Message-ID: <20250717184055.2071216-3-lyude@redhat.com> In-Reply-To: <20250717184055.2071216-1-lyude@redhat.com> References: <20250717184055.2071216-1-lyude@redhat.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 3.0 on 10.30.177.12 Content-Type: text/plain; charset="utf-8" From: Boqun Feng In order to use preempt_count() to tracking the interrupt disable nesting level, __preempt_count_{add,sub}_return() are introduced, as their name suggest, these primitives return the new value of the preempt_count() after changing it. The following example shows the usage of it in local_interrupt_disable(): // increase the HARDIRQ_DISABLE bit new_count =3D __preempt_count_add_return(HARDIRQ_DISABLE_OFFSET); // if it's the first-time increment, then disable the interrupt // at hardware level. if (new_count & HARDIRQ_DISABLE_MASK =3D=3D HARDIRQ_DISABLE_OFFSET) { local_irq_save(flags); raw_cpu_write(local_interrupt_disable_state.flags, flags); } Having these primitives will avoid a read of preempt_count() after changing preempt_count() on certain architectures. Signed-off-by: Boqun Feng Signed-off-by: Lyude Paul --- V10: * Add commit message I forgot * Rebase against latest pcpu_hot changes V11: * Remove CONFIG_PROFILE_ALL_BRANCHES workaround from __preempt_count_add_return() --- arch/arm64/include/asm/preempt.h | 18 ++++++++++++++++++ arch/s390/include/asm/preempt.h | 10 ++++++++++ arch/x86/include/asm/preempt.h | 10 ++++++++++ include/asm-generic/preempt.h | 14 ++++++++++++++ 4 files changed, 52 insertions(+) diff --git a/arch/arm64/include/asm/preempt.h b/arch/arm64/include/asm/pree= mpt.h index 0159b625cc7f0..49cb886c8e1dd 100644 --- a/arch/arm64/include/asm/preempt.h +++ b/arch/arm64/include/asm/preempt.h @@ -56,6 +56,24 @@ static inline void __preempt_count_sub(int val) WRITE_ONCE(current_thread_info()->preempt.count, pc); } =20 +static inline int __preempt_count_add_return(int val) +{ + u32 pc =3D READ_ONCE(current_thread_info()->preempt.count); + pc +=3D val; + WRITE_ONCE(current_thread_info()->preempt.count, pc); + + return pc; +} + +static inline int __preempt_count_sub_return(int val) +{ + u32 pc =3D READ_ONCE(current_thread_info()->preempt.count); + pc -=3D val; + WRITE_ONCE(current_thread_info()->preempt.count, pc); + + return pc; +} + static inline bool __preempt_count_dec_and_test(void) { struct thread_info *ti =3D current_thread_info(); diff --git a/arch/s390/include/asm/preempt.h b/arch/s390/include/asm/preemp= t.h index 6ccd033acfe52..5ae366e26c57d 100644 --- a/arch/s390/include/asm/preempt.h +++ b/arch/s390/include/asm/preempt.h @@ -98,6 +98,16 @@ static __always_inline bool should_resched(int preempt_o= ffset) return unlikely(READ_ONCE(get_lowcore()->preempt_count) =3D=3D preempt_of= fset); } =20 +static __always_inline int __preempt_count_add_return(int val) +{ + return val + __atomic_add(val, &get_lowcore()->preempt_count); +} + +static __always_inline int __preempt_count_sub_return(int val) +{ + return __preempt_count_add_return(-val); +} + #define init_task_preempt_count(p) do { } while (0) /* Deferred to CPU bringup time */ #define init_idle_preempt_count(p, cpu) do { } while (0) diff --git a/arch/x86/include/asm/preempt.h b/arch/x86/include/asm/preempt.h index 578441db09f0b..1220656f3370b 100644 --- a/arch/x86/include/asm/preempt.h +++ b/arch/x86/include/asm/preempt.h @@ -85,6 +85,16 @@ static __always_inline void __preempt_count_sub(int val) raw_cpu_add_4(__preempt_count, -val); 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Thu, 17 Jul 2025 14:41:36 -0400 X-MC-Unique: do_rNXdkPuO-7jzcpv6pgw-1 X-Mimecast-MFC-AGG-ID: do_rNXdkPuO-7jzcpv6pgw_1752777691 Received: from mx-prod-int-02.mail-002.prod.us-west-2.aws.redhat.com (mx-prod-int-02.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.15]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mx-prod-mc-08.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id 57EF61800C34; Thu, 17 Jul 2025 18:41:31 +0000 (UTC) Received: from chopper.redhat.com (unknown [10.22.66.69]) by mx-prod-int-02.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTP id 5438C19560A0; Thu, 17 Jul 2025 18:41:25 +0000 (UTC) From: Lyude Paul To: rust-for-linux@vger.kernel.org, Thomas Gleixner , Boqun Feng , linux-kernel@vger.kernel.org, Daniel Almeida Cc: Ingo Molnar , Peter Zijlstra , Juri Lelli , Vincent Guittot , Dietmar Eggemann , Steven Rostedt , Ben Segall , Mel Gorman , Valentin Schneider , Will Deacon , Waiman Long , Miguel Ojeda , Alex Gaynor , Gary Guo , =?UTF-8?q?Bj=C3=B6rn=20Roy=20Baron?= , Benno Lossin , Andreas Hindborg , Alice Ryhl , Trevor Gross , Danilo Krummrich , Ryo Takakura , "Paul E. McKenney" , Caleb Sander Mateos , NeilBrown , K Prateek Nayak , Sebastian Andrzej Siewior Subject: [PATCH v11 03/14] irq & spin_lock: Add counted interrupt disabling/enabling Date: Thu, 17 Jul 2025 14:37:55 -0400 Message-ID: <20250717184055.2071216-4-lyude@redhat.com> In-Reply-To: <20250717184055.2071216-1-lyude@redhat.com> References: <20250717184055.2071216-1-lyude@redhat.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 3.0 on 10.30.177.15 Content-Type: text/plain; charset="utf-8" From: Boqun Feng Currently the nested interrupt disabling and enabling is present by _irqsave() and _irqrestore() APIs, which are relatively unsafe, for example: spin_lock_irqsave(l1, flag1); spin_lock_irqsave(l2, flag2); spin_unlock_irqrestore(l1, flags1); // accesses to interrupt-disable protect data will cause races. This is even easier to triggered with guard facilities: unsigned long flag2; scoped_guard(spin_lock_irqsave, l1) { spin_lock_irqsave(l2, flag2); } // l2 locked but interrupts are enabled. spin_unlock_irqrestore(l2, flag2); (Hand-to-hand locking critical sections are not uncommon for a fine-grained lock design) And because this unsafety, Rust cannot easily wrap the interrupt-disabling locks in a safe API, which complicates the design. To resolve this, introduce a new set of interrupt disabling APIs: * local_interrupt_disable(); * local_interrupt_enable(); They work like local_irq_save() and local_irq_restore() except that 1) the outermost local_interrupt_disable() call save the interrupt state into a percpu variable, so that the outermost local_interrupt_enable() can restore the state, and 2) a percpu counter is added to record the nest level of these calls, so that interrupts are not accidentally enabled inside the outermost critical section. Also add the corresponding spin_lock primitives: spin_lock_irq_disable() and spin_unlock_irq_enable(), as a result, code as follow: spin_lock_irq_disable(l1); spin_lock_irq_disable(l2); spin_unlock_irq_enable(l1); // Interrupts are still disabled. spin_unlock_irq_enable(l2); doesn't have the issue that interrupts are accidentally enabled. This also makes the wrapper of interrupt-disabling locks on Rust easier to design. Signed-off-by: Boqun Feng Signed-off-by: Lyude Paul --- V10: * Add missing __raw_spin_lock_irq_disable() definition in spinlock.c V11 * Move definition of spin_trylock_irq_disable() into this commit * Get rid of leftover space * Remove unneeded preempt_disable()/preempt_enable() --- include/linux/irqflags_types.h | 6 ++++ include/linux/preempt.h | 4 +++ include/linux/spinlock.h | 62 ++++++++++++++++++++++++++++++++ include/linux/spinlock_api_smp.h | 27 ++++++++++++++ include/linux/spinlock_api_up.h | 8 +++++ include/linux/spinlock_rt.h | 15 ++++++++ kernel/locking/spinlock.c | 29 +++++++++++++++ kernel/softirq.c | 3 ++ 8 files changed, 154 insertions(+) diff --git a/include/linux/irqflags_types.h b/include/linux/irqflags_types.h index c13f0d915097a..277433f7f53eb 100644 --- a/include/linux/irqflags_types.h +++ b/include/linux/irqflags_types.h @@ -19,4 +19,10 @@ struct irqtrace_events { =20 #endif =20 +/* Per-cpu interrupt disabling state for local_interrupt_{disable,enable}(= ) */ +struct interrupt_disable_state { + unsigned long flags; + long count; +}; + #endif /* _LINUX_IRQFLAGS_TYPES_H */ diff --git a/include/linux/preempt.h b/include/linux/preempt.h index 809af7b57470a..c1c5795be5d0f 100644 --- a/include/linux/preempt.h +++ b/include/linux/preempt.h @@ -148,6 +148,10 @@ static __always_inline unsigned char interrupt_context= _level(void) #define in_softirq() (softirq_count()) #define in_interrupt() (irq_count()) =20 +#define hardirq_disable_count() ((preempt_count() & HARDIRQ_DISABLE_MASK) = >> HARDIRQ_DISABLE_SHIFT) +#define hardirq_disable_enter() __preempt_count_add_return(HARDIRQ_DISABLE= _OFFSET) +#define hardirq_disable_exit() __preempt_count_sub_return(HARDIRQ_DISABLE_= OFFSET) + /* * The preempt_count offset after preempt_disable(); */ diff --git a/include/linux/spinlock.h b/include/linux/spinlock.h index d3561c4a080e2..b21da4bd51a42 100644 --- a/include/linux/spinlock.h +++ b/include/linux/spinlock.h @@ -272,9 +272,11 @@ static inline void do_raw_spin_unlock(raw_spinlock_t *= lock) __releases(lock) #endif =20 #define raw_spin_lock_irq(lock) _raw_spin_lock_irq(lock) +#define raw_spin_lock_irq_disable(lock) _raw_spin_lock_irq_disable(lock) #define raw_spin_lock_bh(lock) _raw_spin_lock_bh(lock) #define raw_spin_unlock(lock) _raw_spin_unlock(lock) #define raw_spin_unlock_irq(lock) _raw_spin_unlock_irq(lock) +#define raw_spin_unlock_irq_enable(lock) _raw_spin_unlock_irq_enable(lock) =20 #define raw_spin_unlock_irqrestore(lock, flags) \ do { \ @@ -300,11 +302,56 @@ static inline void do_raw_spin_unlock(raw_spinlock_t = *lock) __releases(lock) 1 : ({ local_irq_restore(flags); 0; }); \ }) =20 +#define raw_spin_trylock_irq_disable(lock) \ +({ \ + local_interrupt_disable(); \ + raw_spin_trylock(lock) ? \ + 1 : ({ local_interrupt_enable(); 0; }); \ +}) + #ifndef CONFIG_PREEMPT_RT /* Include rwlock functions for !RT */ #include #endif =20 +DECLARE_PER_CPU(struct interrupt_disable_state, local_interrupt_disable_st= ate); + +static inline void local_interrupt_disable(void) +{ + unsigned long flags; + int new_count; + + new_count =3D hardirq_disable_enter(); + + if ((new_count & HARDIRQ_DISABLE_MASK) =3D=3D HARDIRQ_DISABLE_OFFSET) { + local_irq_save(flags); + raw_cpu_write(local_interrupt_disable_state.flags, flags); + } +} + +static inline void local_interrupt_enable(void) +{ + int new_count; + + new_count =3D hardirq_disable_exit(); + + if ((new_count & HARDIRQ_DISABLE_MASK) =3D=3D 0) { + unsigned long flags; + + flags =3D raw_cpu_read(local_interrupt_disable_state.flags); + local_irq_restore(flags); + /* + * TODO: re-read preempt count can be avoided, but it needs + * should_resched() taking another parameter as the current + * preempt count + */ +#ifdef PREEMPTION + if (should_resched(0)) + __preempt_schedule(); +#endif + } +} + /* * Pull the _spin_*()/_read_*()/_write_*() functions/declarations: */ @@ -376,6 +423,11 @@ static __always_inline void spin_lock_irq(spinlock_t *= lock) raw_spin_lock_irq(&lock->rlock); } =20 +static __always_inline void spin_lock_irq_disable(spinlock_t *lock) +{ + raw_spin_lock_irq_disable(&lock->rlock); +} + #define spin_lock_irqsave(lock, flags) \ do { \ raw_spin_lock_irqsave(spinlock_check(lock), flags); \ @@ -401,6 +453,11 @@ static __always_inline void spin_unlock_irq(spinlock_t= *lock) raw_spin_unlock_irq(&lock->rlock); } =20 +static __always_inline void spin_unlock_irq_enable(spinlock_t *lock) +{ + raw_spin_unlock_irq_enable(&lock->rlock); +} + static __always_inline void spin_unlock_irqrestore(spinlock_t *lock, unsig= ned long flags) { raw_spin_unlock_irqrestore(&lock->rlock, flags); @@ -421,6 +478,11 @@ static __always_inline int spin_trylock_irq(spinlock_t= *lock) raw_spin_trylock_irqsave(spinlock_check(lock), flags); \ }) =20 +static __always_inline int spin_trylock_irq_disable(spinlock_t *lock) +{ + return raw_spin_trylock_irq_disable(&lock->rlock); +} + /** * spin_is_locked() - Check whether a spinlock is locked. * @lock: Pointer to the spinlock. diff --git a/include/linux/spinlock_api_smp.h b/include/linux/spinlock_api_= smp.h index 9ecb0ab504e32..92532103b9eaa 100644 --- a/include/linux/spinlock_api_smp.h +++ b/include/linux/spinlock_api_smp.h @@ -28,6 +28,8 @@ _raw_spin_lock_nest_lock(raw_spinlock_t *lock, struct loc= kdep_map *map) void __lockfunc _raw_spin_lock_bh(raw_spinlock_t *lock) __acquires(lock); void __lockfunc _raw_spin_lock_irq(raw_spinlock_t *lock) __acquires(lock); +void __lockfunc _raw_spin_lock_irq_disable(raw_spinlock_t *lock) + __acquires(lock); =20 unsigned long __lockfunc _raw_spin_lock_irqsave(raw_spinlock_t *lock) __acquires(lock); @@ -39,6 +41,7 @@ int __lockfunc _raw_spin_trylock_bh(raw_spinlock_t *lock); void __lockfunc _raw_spin_unlock(raw_spinlock_t *lock) __releases(lock); void __lockfunc _raw_spin_unlock_bh(raw_spinlock_t *lock) __releases(lock); void __lockfunc _raw_spin_unlock_irq(raw_spinlock_t *lock) __releases(lock= ); +void __lockfunc _raw_spin_unlock_irq_enable(raw_spinlock_t *lock) __releas= es(lock); void __lockfunc _raw_spin_unlock_irqrestore(raw_spinlock_t *lock, unsigned long flags) __releases(lock); @@ -55,6 +58,11 @@ _raw_spin_unlock_irqrestore(raw_spinlock_t *lock, unsign= ed long flags) #define _raw_spin_lock_irq(lock) __raw_spin_lock_irq(lock) #endif =20 +/* Use the same config as spin_lock_irq() temporarily. */ +#ifdef CONFIG_INLINE_SPIN_LOCK_IRQ +#define _raw_spin_lock_irq_disable(lock) __raw_spin_lock_irq_disable(lock) +#endif + #ifdef CONFIG_INLINE_SPIN_LOCK_IRQSAVE #define _raw_spin_lock_irqsave(lock) __raw_spin_lock_irqsave(lock) #endif @@ -79,6 +87,11 @@ _raw_spin_unlock_irqrestore(raw_spinlock_t *lock, unsign= ed long flags) #define _raw_spin_unlock_irq(lock) __raw_spin_unlock_irq(lock) #endif =20 +/* Use the same config as spin_unlock_irq() temporarily. */ +#ifdef CONFIG_INLINE_SPIN_UNLOCK_IRQ +#define _raw_spin_unlock_irq_enable(lock) __raw_spin_unlock_irq_enable(loc= k) +#endif + #ifdef CONFIG_INLINE_SPIN_UNLOCK_IRQRESTORE #define _raw_spin_unlock_irqrestore(lock, flags) __raw_spin_unlock_irqrest= ore(lock, flags) #endif @@ -120,6 +133,13 @@ static inline void __raw_spin_lock_irq(raw_spinlock_t = *lock) LOCK_CONTENDED(lock, do_raw_spin_trylock, do_raw_spin_lock); } =20 +static inline void __raw_spin_lock_irq_disable(raw_spinlock_t *lock) +{ + local_interrupt_disable(); + spin_acquire(&lock->dep_map, 0, 0, _RET_IP_); + LOCK_CONTENDED(lock, do_raw_spin_trylock, do_raw_spin_lock); +} + static inline void __raw_spin_lock_bh(raw_spinlock_t *lock) { __local_bh_disable_ip(_RET_IP_, SOFTIRQ_LOCK_OFFSET); @@ -160,6 +180,13 @@ static inline void __raw_spin_unlock_irq(raw_spinlock_= t *lock) preempt_enable(); } =20 +static inline void __raw_spin_unlock_irq_enable(raw_spinlock_t *lock) +{ + spin_release(&lock->dep_map, _RET_IP_); + do_raw_spin_unlock(lock); + local_interrupt_enable(); +} + static inline void __raw_spin_unlock_bh(raw_spinlock_t *lock) { spin_release(&lock->dep_map, _RET_IP_); diff --git a/include/linux/spinlock_api_up.h b/include/linux/spinlock_api_u= p.h index 819aeba1c87e6..d02a73671713b 100644 --- a/include/linux/spinlock_api_up.h +++ b/include/linux/spinlock_api_up.h @@ -36,6 +36,9 @@ #define __LOCK_IRQ(lock) \ do { local_irq_disable(); __LOCK(lock); } while (0) =20 +#define __LOCK_IRQ_DISABLE(lock) \ + do { local_interrupt_disable(); __LOCK(lock); } while (0) + #define __LOCK_IRQSAVE(lock, flags) \ do { local_irq_save(flags); __LOCK(lock); } while (0) =20 @@ -52,6 +55,9 @@ #define __UNLOCK_IRQ(lock) \ do { local_irq_enable(); __UNLOCK(lock); } while (0) =20 +#define __UNLOCK_IRQ_ENABLE(lock) \ + do { __UNLOCK(lock); local_interrupt_enable(); } while (0) + #define __UNLOCK_IRQRESTORE(lock, flags) \ do { local_irq_restore(flags); __UNLOCK(lock); } while (0) =20 @@ -64,6 +70,7 @@ #define _raw_read_lock_bh(lock) __LOCK_BH(lock) #define _raw_write_lock_bh(lock) __LOCK_BH(lock) #define _raw_spin_lock_irq(lock) __LOCK_IRQ(lock) +#define _raw_spin_lock_irq_disable(lock) __LOCK_IRQ_DISABLE(lock) #define _raw_read_lock_irq(lock) __LOCK_IRQ(lock) #define _raw_write_lock_irq(lock) __LOCK_IRQ(lock) #define _raw_spin_lock_irqsave(lock, flags) __LOCK_IRQSAVE(lock, flags) @@ -80,6 +87,7 @@ #define _raw_write_unlock_bh(lock) __UNLOCK_BH(lock) #define _raw_read_unlock_bh(lock) __UNLOCK_BH(lock) #define _raw_spin_unlock_irq(lock) __UNLOCK_IRQ(lock) +#define _raw_spin_unlock_irq_enable(lock) __UNLOCK_IRQ_ENABLE(lock) #define _raw_read_unlock_irq(lock) __UNLOCK_IRQ(lock) #define _raw_write_unlock_irq(lock) __UNLOCK_IRQ(lock) #define _raw_spin_unlock_irqrestore(lock, flags) \ diff --git a/include/linux/spinlock_rt.h b/include/linux/spinlock_rt.h index f6499c37157df..074182f7cfeea 100644 --- a/include/linux/spinlock_rt.h +++ b/include/linux/spinlock_rt.h @@ -93,6 +93,11 @@ static __always_inline void spin_lock_irq(spinlock_t *lo= ck) rt_spin_lock(lock); } =20 +static __always_inline void spin_lock_irq_disable(spinlock_t *lock) +{ + rt_spin_lock(lock); +} + #define spin_lock_irqsave(lock, flags) \ do { \ typecheck(unsigned long, flags); \ @@ -116,12 +121,22 @@ static __always_inline void spin_unlock_irq(spinlock_= t *lock) rt_spin_unlock(lock); } =20 +static __always_inline void spin_unlock_irq_enable(spinlock_t *lock) +{ + rt_spin_unlock(lock); +} + static __always_inline void spin_unlock_irqrestore(spinlock_t *lock, unsigned long flags) { rt_spin_unlock(lock); } =20 +static __always_inline int spin_trylock_irq_disable(spinlock_t *lock) +{ + return rt_spin_trylock(lock); +} + #define spin_trylock(lock) \ __cond_lock(lock, rt_spin_trylock(lock)) =20 diff --git a/kernel/locking/spinlock.c b/kernel/locking/spinlock.c index 7685defd7c526..da54b220b5a45 100644 --- a/kernel/locking/spinlock.c +++ b/kernel/locking/spinlock.c @@ -125,6 +125,19 @@ static void __lockfunc __raw_##op##_lock_bh(locktype##= _t *lock) \ */ BUILD_LOCK_OPS(spin, raw_spinlock); =20 +/* No rwlock_t variants for now, so just build this function by hand */ +static void __lockfunc __raw_spin_lock_irq_disable(raw_spinlock_t *lock) +{ + for (;;) { + local_interrupt_disable(); + if (likely(do_raw_spin_trylock(lock))) + break; + local_interrupt_enable(); + + arch_spin_relax(&lock->raw_lock); + } +} + #ifndef CONFIG_PREEMPT_RT BUILD_LOCK_OPS(read, rwlock); BUILD_LOCK_OPS(write, rwlock); @@ -172,6 +185,14 @@ noinline void __lockfunc _raw_spin_lock_irq(raw_spinlo= ck_t *lock) EXPORT_SYMBOL(_raw_spin_lock_irq); #endif =20 +#ifndef CONFIG_INLINE_SPIN_LOCK_IRQ +noinline void __lockfunc _raw_spin_lock_irq_disable(raw_spinlock_t *lock) +{ + __raw_spin_lock_irq_disable(lock); +} +EXPORT_SYMBOL_GPL(_raw_spin_lock_irq_disable); +#endif + #ifndef CONFIG_INLINE_SPIN_LOCK_BH noinline void __lockfunc _raw_spin_lock_bh(raw_spinlock_t *lock) { @@ -204,6 +225,14 @@ noinline void __lockfunc _raw_spin_unlock_irq(raw_spin= lock_t *lock) EXPORT_SYMBOL(_raw_spin_unlock_irq); #endif =20 +#ifndef CONFIG_INLINE_SPIN_UNLOCK_IRQ +noinline void __lockfunc _raw_spin_unlock_irq_enable(raw_spinlock_t *lock) +{ + __raw_spin_unlock_irq_enable(lock); 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Thu, 17 Jul 2025 14:41:35 -0400 X-MC-Unique: ico_mijHOLimFRYYJEkG9g-1 X-Mimecast-MFC-AGG-ID: ico_mijHOLimFRYYJEkG9g_1752777694 Received: from mx-prod-int-02.mail-002.prod.us-west-2.aws.redhat.com (mx-prod-int-02.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.15]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mx-prod-mc-06.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id 0D61F1800283; Thu, 17 Jul 2025 18:41:34 +0000 (UTC) Received: from chopper.redhat.com (unknown [10.22.66.69]) by mx-prod-int-02.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTP id D18F01956089; Thu, 17 Jul 2025 18:41:32 +0000 (UTC) From: Lyude Paul To: rust-for-linux@vger.kernel.org, Thomas Gleixner , Boqun Feng , linux-kernel@vger.kernel.org, Daniel Almeida Subject: [PATCH v11 04/14] irq: Add KUnit test for refcounted interrupt enable/disable Date: Thu, 17 Jul 2025 14:37:56 -0400 Message-ID: <20250717184055.2071216-5-lyude@redhat.com> In-Reply-To: <20250717184055.2071216-1-lyude@redhat.com> References: <20250717184055.2071216-1-lyude@redhat.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 3.0 on 10.30.177.15 Content-Type: text/plain; charset="utf-8" While making changes to the refcounted interrupt patch series, at some point on my local branch I broke something and ended up writing some kunit tests for testing refcounted interrupts as a result. So, let's include these tests now that we have refcounted interrupts. Signed-off-by: Lyude Paul --- kernel/irq/Makefile | 1 + kernel/irq/refcount_interrupt_test.c | 108 +++++++++++++++++++++++++++ 2 files changed, 109 insertions(+) create mode 100644 kernel/irq/refcount_interrupt_test.c diff --git a/kernel/irq/Makefile b/kernel/irq/Makefile index c0f44c06d69df..dbab58fe59ee0 100644 --- a/kernel/irq/Makefile +++ b/kernel/irq/Makefile @@ -19,3 +19,4 @@ obj-$(CONFIG_GENERIC_IRQ_IPI_MUX) +=3D ipi-mux.o obj-$(CONFIG_SMP) +=3D affinity.o obj-$(CONFIG_GENERIC_IRQ_DEBUGFS) +=3D debugfs.o obj-$(CONFIG_GENERIC_IRQ_MATRIX_ALLOCATOR) +=3D matrix.o +obj-$(CONFIG_KUNIT) +=3D refcount_interrupt_test.o diff --git a/kernel/irq/refcount_interrupt_test.c b/kernel/irq/refcount_int= errupt_test.c new file mode 100644 index 0000000000000..8fe938db2860f --- /dev/null +++ b/kernel/irq/refcount_interrupt_test.c @@ -0,0 +1,108 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * KUnit test for refcounted interrupt enable/disables. + */ + +#include +#include + +#define TEST_IRQ_ON() KUNIT_EXPECT_FALSE(test, irqs_disabled()) +#define TEST_IRQ_OFF() KUNIT_EXPECT_TRUE(test, irqs_disabled()) + +/* =3D=3D=3D=3D=3D Test cases =3D=3D=3D=3D=3D */ +static void test_single_irq_change(struct kunit *test) +{ + local_interrupt_disable(); + TEST_IRQ_OFF(); + local_interrupt_enable(); +} + +static void test_nested_irq_change(struct kunit *test) +{ + local_interrupt_disable(); + TEST_IRQ_OFF(); + local_interrupt_disable(); + TEST_IRQ_OFF(); + local_interrupt_disable(); + TEST_IRQ_OFF(); + + local_interrupt_enable(); + TEST_IRQ_OFF(); + local_interrupt_enable(); + TEST_IRQ_OFF(); + local_interrupt_enable(); + TEST_IRQ_ON(); +} + +static void test_multiple_irq_change(struct kunit *test) +{ + local_interrupt_disable(); + TEST_IRQ_OFF(); + local_interrupt_disable(); + TEST_IRQ_OFF(); + + local_interrupt_enable(); + TEST_IRQ_OFF(); + local_interrupt_enable(); + TEST_IRQ_ON(); + + local_interrupt_disable(); + TEST_IRQ_OFF(); + local_interrupt_enable(); + TEST_IRQ_ON(); +} + +static void test_irq_save(struct kunit *test) +{ + unsigned long flags; + + local_irq_save(flags); + TEST_IRQ_OFF(); + local_interrupt_disable(); + TEST_IRQ_OFF(); + local_interrupt_enable(); + TEST_IRQ_OFF(); + local_irq_restore(flags); + TEST_IRQ_ON(); + + local_interrupt_disable(); + TEST_IRQ_OFF(); + local_irq_save(flags); + TEST_IRQ_OFF(); + local_irq_restore(flags); + TEST_IRQ_OFF(); + local_interrupt_enable(); + TEST_IRQ_ON(); +} + +static struct kunit_case test_cases[] =3D { + KUNIT_CASE(test_single_irq_change), + KUNIT_CASE(test_nested_irq_change), + KUNIT_CASE(test_multiple_irq_change), + KUNIT_CASE(test_irq_save), + {}, +}; + +/* (init and exit are the same */ +static int test_init(struct kunit *test) +{ + TEST_IRQ_ON(); + + return 0; +} + +static void test_exit(struct kunit *test) +{ + TEST_IRQ_ON(); +} + +static struct kunit_suite refcount_interrupt_test_suite =3D { + .name =3D "refcount_interrupt", + .test_cases =3D test_cases, + .init =3D test_init, + .exit =3D test_exit, +}; + +kunit_test_suites(&refcount_interrupt_test_suite); + +MODULE_AUTHOR("Lyude Paul "); --=20 2.50.0 From nobody Mon Oct 6 19:07:10 2025 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 3485A2FCE12 for ; 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charset="utf-8" Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 3.4.1 on 10.30.177.93 This introduces a module for dealing with interrupt-disabled contexts, including the ability to enable and disable interrupts along with the ability to annotate functions as expecting that IRQs are already disabled on the local CPU. [Boqun: This is based on Lyude's work on interrupt disable abstraction, I port to the new local_interrupt_disable() mechanism to make it work as a guard type. I cannot even take the credit of this design, since Lyude also brought up the same idea in zulip. Anyway, this is only for POC purpose, and of course all bugs are mine] Signed-off-by: Lyude Paul Co-developed-by: Boqun Feng Signed-off-by: Boqun Feng Reviewed-by: Benno Lossin --- V10: * Fix documentation typos V11: * Get rid of unneeded `use bindings;` * Move ASSUME_DISABLED into assume_disabled() * Confirm using lockdep_assert_irqs_disabled() that local interrupts are in fact disabled when LocalInterruptDisabled::assume_disabled() is called. --- rust/helpers/helpers.c | 1 + rust/helpers/interrupt.c | 18 +++++++++ rust/helpers/sync.c | 5 +++ rust/kernel/interrupt.rs | 86 ++++++++++++++++++++++++++++++++++++++++ rust/kernel/lib.rs | 1 + 5 files changed, 111 insertions(+) create mode 100644 rust/helpers/interrupt.c create mode 100644 rust/kernel/interrupt.rs diff --git a/rust/helpers/helpers.c b/rust/helpers/helpers.c index 0683fffdbde25..1338aaef41987 100644 --- a/rust/helpers/helpers.c +++ b/rust/helpers/helpers.c @@ -23,6 +23,7 @@ #include "drm.c" #include "err.c" #include "fs.c" +#include "interrupt.c" #include "io.c" #include "jump_label.c" #include "kunit.c" diff --git a/rust/helpers/interrupt.c b/rust/helpers/interrupt.c new file mode 100644 index 0000000000000..f2380dd461ca5 --- /dev/null +++ b/rust/helpers/interrupt.c @@ -0,0 +1,18 @@ +// SPDX-License-Identifier: GPL-2.0 + +#include + +void rust_helper_local_interrupt_disable(void) +{ + local_interrupt_disable(); +} + +void rust_helper_local_interrupt_enable(void) +{ + local_interrupt_enable(); +} + +bool rust_helper_irqs_disabled(void) +{ + return irqs_disabled(); +} diff --git a/rust/helpers/sync.c b/rust/helpers/sync.c index ff7e68b488101..45b2f519f4e2e 100644 --- a/rust/helpers/sync.c +++ b/rust/helpers/sync.c @@ -11,3 +11,8 @@ void rust_helper_lockdep_unregister_key(struct lock_class= _key *k) { lockdep_unregister_key(k); } + +void rust_helper_lockdep_assert_irqs_disabled(void) +{ + lockdep_assert_irqs_disabled(); +} diff --git a/rust/kernel/interrupt.rs b/rust/kernel/interrupt.rs new file mode 100644 index 0000000000000..6c8d2f58bca70 --- /dev/null +++ b/rust/kernel/interrupt.rs @@ -0,0 +1,86 @@ +// SPDX-License-Identifier: GPL-2.0 + +//! Interrupt controls +//! +//! This module allows Rust code to annotate areas of code where local pro= cessor interrupts should +//! be disabled, along with actually disabling local processor interrupts. +//! +//! # =E2=9A=A0=EF=B8=8F Warning! =E2=9A=A0=EF=B8=8F +//! +//! The usage of this module can be more complicated than meets the eye, e= specially surrounding +//! [preemptible kernels]. It's recommended to take care when using the fu= nctions and types defined +//! here and familiarize yourself with the various documentation we have b= efore using them, along +//! with the various documents we link to here. +//! +//! # Reading material +//! +//! - [Software interrupts and realtime (LWN)](https://lwn.net/Articles/52= 0076) +//! +//! [preemptible kernels]: https://www.kernel.org/doc/html/latest/locking/= preempt-locking.html + +use kernel::types::NotThreadSafe; + +/// A guard that represents local processor interrupt disablement on preem= ptible kernels. +/// +/// [`LocalInterruptDisabled`] is a guard type that represents that local = processor interrupts have +/// been disabled on a preemptible kernel. +/// +/// Certain functions take an immutable reference of [`LocalInterruptDisab= led`] in order to require +/// that they may only be run in local-interrupt-disabled contexts on pree= mptible kernels. +/// +/// This is a marker type; it has no size, and is simply used as a compile= -time guarantee that local +/// processor interrupts are disabled on preemptible kernels. Note that no= guarantees about the +/// state of interrupts are made by this type on non-preemptible kernels. +/// +/// # Invariants +/// +/// Local processor interrupts are disabled on preemptible kernels for as = long as an object of this +/// type exists. +pub struct LocalInterruptDisabled(NotThreadSafe); + +/// Disable local processor interrupts on a preemptible kernel. +/// +/// This function disables local processor interrupts on a preemptible ker= nel, and returns a +/// [`LocalInterruptDisabled`] token as proof of this. On non-preemptible = kernels, this function is +/// a no-op. +/// +/// **Usage of this function is discouraged** unless you are absolutely su= re you know what you are +/// doing, as kernel interfaces for rust that deal with interrupt state wi= ll typically handle local +/// processor interrupt state management on their own and managing this by= hand is quite error +/// prone. +pub fn local_interrupt_disable() -> LocalInterruptDisabled { + // SAFETY: It's always safe to call `local_interrupt_disable()`. + unsafe { bindings::local_interrupt_disable() }; + + LocalInterruptDisabled(NotThreadSafe) +} + +impl Drop for LocalInterruptDisabled { + fn drop(&mut self) { + // SAFETY: Per type invariants, a `local_interrupt_disable()` must= be called to create this + // object, hence call the corresponding `local_interrupt_enable()`= is safe. + unsafe { bindings::local_interrupt_enable() }; + } +} + +impl LocalInterruptDisabled { + /// Assume that local processor interrupts are disabled on preemptible= kernels. + /// + /// This can be used for annotating code that is known to be run in co= ntexts where local + /// processor interrupts are disabled on preemptible kernels. It makes= no changes to the local + /// interrupt state on its own. + /// + /// # Safety + /// + /// For the whole life `'a`, local interrupts must be disabled on pree= mptible kernels. This + /// could be a context like for example, an interrupt handler. + pub unsafe fn assume_disabled<'a>() -> &'a LocalInterruptDisabled { + const ASSUME_DISABLED: &LocalInterruptDisabled =3D &LocalInterrupt= Disabled(NotThreadSafe); + + // Confirm they're actually disabled if lockdep is available + // SAFETY: It's always safe to call `lockdep_assert_irqs_disabled(= )` + unsafe { bindings::lockdep_assert_irqs_disabled() }; + + ASSUME_DISABLED + } +} diff --git a/rust/kernel/lib.rs b/rust/kernel/lib.rs index f61ac6f81f5d7..f8c1ae6ddb9d9 100644 --- a/rust/kernel/lib.rs +++ b/rust/kernel/lib.rs @@ -79,6 +79,7 @@ pub mod firmware; pub mod fs; pub mod init; +pub mod interrupt; pub mod io; pub mod ioctl; pub mod jump_label; --=20 2.50.0 From nobody Mon Oct 6 19:07:10 2025 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id A41B020ED for ; 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charset="utf-8" From: Boqun Feng spin_lock_irq_disable() and spin_unlock_irq_enable() are inline functions, to use them in Rust, helpers are introduced. This is for interrupt disabling lock abstraction in Rust. Signed-off-by: Boqun Feng Signed-off-by: Lyude Paul --- rust/helpers/spinlock.c | 15 +++++++++++++++ 1 file changed, 15 insertions(+) diff --git a/rust/helpers/spinlock.c b/rust/helpers/spinlock.c index 42c4bf01a23e4..d4e61057c2a7a 100644 --- a/rust/helpers/spinlock.c +++ b/rust/helpers/spinlock.c @@ -35,3 +35,18 @@ void rust_helper_spin_assert_is_held(spinlock_t *lock) { lockdep_assert_held(lock); } + +void rust_helper_spin_lock_irq_disable(spinlock_t *lock) +{ + spin_lock_irq_disable(lock); +} + +void rust_helper_spin_unlock_irq_enable(spinlock_t *lock) +{ + spin_unlock_irq_enable(lock); +} + +int rust_helper_spin_trylock_irq_disable(spinlock_t *lock) +{ + return spin_trylock_irq_disable(lock); +} --=20 2.50.0 From nobody Mon Oct 6 19:07:10 2025 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 27F8C20C469 for ; 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charset="utf-8" A variant of SpinLock that is expected to be used in noirq contexts, so lock() will disable interrupts and unlock() (i.e. `Guard::drop()` will undo the interrupt disable. [Boqun: Port to use spin_lock_irq_disable() and spin_unlock_irq_enable()] Signed-off-by: Lyude Paul Co-developed-by: Boqun Feng Signed-off-by: Boqun Feng --- V10: * Also add support to GlobalLock * Documentation fixes from Dirk V11: * Add unit test requested by Daniel Almeida --- rust/kernel/sync.rs | 4 +- rust/kernel/sync/lock/global.rs | 3 + rust/kernel/sync/lock/spinlock.rs | 229 ++++++++++++++++++++++++++++++ 3 files changed, 235 insertions(+), 1 deletion(-) diff --git a/rust/kernel/sync.rs b/rust/kernel/sync.rs index 63c99e015ad6f..f1e448e096ea9 100644 --- a/rust/kernel/sync.rs +++ b/rust/kernel/sync.rs @@ -22,7 +22,9 @@ pub use condvar::{new_condvar, CondVar, CondVarTimeoutResult}; pub use lock::global::{global_lock, GlobalGuard, GlobalLock, GlobalLockBac= kend, GlobalLockedBy}; pub use lock::mutex::{new_mutex, Mutex, MutexGuard}; -pub use lock::spinlock::{new_spinlock, SpinLock, SpinLockGuard}; +pub use lock::spinlock::{ + new_spinlock, new_spinlock_irq, SpinLock, SpinLockGuard, SpinLockIrq, = SpinLockIrqGuard, +}; pub use locked_by::LockedBy; =20 /// Represents a lockdep class. It's a wrapper around C's `lock_class_key`. diff --git a/rust/kernel/sync/lock/global.rs b/rust/kernel/sync/lock/global= .rs index d65f94b5caf26..47e200b750c1d 100644 --- a/rust/kernel/sync/lock/global.rs +++ b/rust/kernel/sync/lock/global.rs @@ -299,4 +299,7 @@ macro_rules! global_lock_inner { (backend SpinLock) =3D> { $crate::sync::lock::spinlock::SpinLockBackend }; + (backend SpinLockIrq) =3D> { + $crate::sync::lock::spinlock::SpinLockIrqBackend + }; } diff --git a/rust/kernel/sync/lock/spinlock.rs b/rust/kernel/sync/lock/spin= lock.rs index d7be38ccbdc7d..6e6d571acd90c 100644 --- a/rust/kernel/sync/lock/spinlock.rs +++ b/rust/kernel/sync/lock/spinlock.rs @@ -3,6 +3,7 @@ //! A kernel spinlock. //! //! This module allows Rust code to use the kernel's `spinlock_t`. +use crate::prelude::*; =20 /// Creates a [`SpinLock`] initialiser with the given name and a newly-cre= ated lock class. /// @@ -139,3 +140,231 @@ unsafe fn assert_is_held(ptr: *mut Self::State) { unsafe { bindings::spin_assert_is_held(ptr) } } } + +/// Creates a [`SpinLockIrq`] initialiser with the given name and a newly-= created lock class. +/// +/// It uses the name if one is given, otherwise it generates one based on = the file name and line +/// number. +#[macro_export] +macro_rules! new_spinlock_irq { + ($inner:expr $(, $name:literal)? $(,)?) =3D> { + $crate::sync::SpinLockIrq::new( + $inner, $crate::optional_name!($($name)?), $crate::static_lock= _class!()) + }; +} +pub use new_spinlock_irq; + +/// A spinlock that may be acquired when local processor interrupts are di= sabled. +/// +/// This is a version of [`SpinLock`] that can only be used in contexts wh= ere interrupts for the +/// local CPU are disabled. It can be acquired in two ways: +/// +/// - Using [`lock()`] like any other type of lock, in which case the bind= ings will modify the +/// interrupt state to ensure that local processor interrupts remain dis= abled for at least as long +/// as the [`SpinLockIrqGuard`] exists. +/// - Using [`lock_with()`] in contexts where a [`LocalInterruptDisabled`]= token is present and +/// local processor interrupts are already known to be disabled, in whic= h case the local interrupt +/// state will not be touched. This method should be preferred if a [`Lo= calInterruptDisabled`] +/// token is present in the scope. +/// +/// For more info on spinlocks, see [`SpinLock`]. For more information on = interrupts, +/// [see the interrupt module](kernel::interrupt). +/// +/// # Examples +/// +/// The following example shows how to declare, allocate initialise and ac= cess a struct (`Example`) +/// that contains an inner struct (`Inner`) that is protected by a spinloc= k that requires local +/// processor interrupts to be disabled. +/// +/// ``` +/// use kernel::sync::{new_spinlock_irq, SpinLockIrq}; +/// +/// struct Inner { +/// a: u32, +/// b: u32, +/// } +/// +/// #[pin_data] +/// struct Example { +/// #[pin] +/// c: SpinLockIrq, +/// #[pin] +/// d: SpinLockIrq, +/// } +/// +/// impl Example { +/// fn new() -> impl PinInit { +/// pin_init!(Self { +/// c <- new_spinlock_irq!(Inner { a: 0, b: 10 }), +/// d <- new_spinlock_irq!(Inner { a: 20, b: 30 }), +/// }) +/// } +/// } +/// +/// // Allocate a boxed `Example` +/// let e =3D KBox::pin_init(Example::new(), GFP_KERNEL)?; +/// +/// // Accessing an `Example` from a context where interrupts may not be d= isabled already. +/// let c_guard =3D e.c.lock(); // interrupts are disabled now, +1 interru= pt disable refcount +/// let d_guard =3D e.d.lock(); // no interrupt state change, +1 interrupt= disable refcount +/// +/// assert_eq!(c_guard.a, 0); +/// assert_eq!(c_guard.b, 10); +/// assert_eq!(d_guard.a, 20); +/// assert_eq!(d_guard.b, 30); +/// +/// drop(c_guard); // Dropping c_guard will not re-enable interrupts just = yet, since d_guard is +/// // still in scope. +/// drop(d_guard); // Last interrupt disable reference dropped here, so in= terrupts are re-enabled +/// // now +/// # Ok::<(), Error>(()) +/// ``` +/// +/// [`lock()`]: SpinLockIrq::lock +/// [`lock_with()`]: SpinLockIrq::lock_with +pub type SpinLockIrq =3D super::Lock; + +/// A kernel `spinlock_t` lock backend that is acquired in interrupt disab= led contexts. +pub struct SpinLockIrqBackend; + +/// A [`Guard`] acquired from locking a [`SpinLockIrq`] using [`lock()`]. +/// +/// This is simply a type alias for a [`Guard`] returned from locking a [`= SpinLockIrq`] using +/// [`lock_with()`]. It will unlock the [`SpinLockIrq`] and decrement the = local processor's +/// interrupt disablement refcount upon being dropped. +/// +/// [`Guard`]: super::Guard +/// [`lock()`]: SpinLockIrq::lock +/// [`lock_with()`]: SpinLockIrq::lock_with +pub type SpinLockIrqGuard<'a, T> =3D super::Guard<'a, T, SpinLockIrqBacken= d>; + +// SAFETY: The underlying kernel `spinlock_t` object ensures mutual exclus= ion. `relock` uses the +// default implementation that always calls the same locking method. +unsafe impl super::Backend for SpinLockIrqBackend { + type State =3D bindings::spinlock_t; + type GuardState =3D (); + + unsafe fn init( + ptr: *mut Self::State, + name: *const crate::ffi::c_char, + key: *mut bindings::lock_class_key, + ) { + // SAFETY: The safety requirements ensure that `ptr` is valid for = writes, and `name` and + // `key` are valid for read indefinitely. + unsafe { bindings::__spin_lock_init(ptr, name, key) } + } + + unsafe fn lock(ptr: *mut Self::State) -> Self::GuardState { + // SAFETY: The safety requirements of this function ensure that `p= tr` points to valid + // memory, and that it has been initialised before. + unsafe { bindings::spin_lock_irq_disable(ptr) } + } + + unsafe fn unlock(ptr: *mut Self::State, _guard_state: &Self::GuardStat= e) { + // SAFETY: The safety requirements of this function ensure that `p= tr` is valid and that the + // caller is the owner of the spinlock. + unsafe { bindings::spin_unlock_irq_enable(ptr) } + } + + unsafe fn try_lock(ptr: *mut Self::State) -> Option { + // SAFETY: The `ptr` pointer is guaranteed to be valid and initial= ized before use. + let result =3D unsafe { bindings::spin_trylock_irq_disable(ptr) }; + + if result !=3D 0 { + Some(()) + } else { + None + } + } + + unsafe fn assert_is_held(ptr: *mut Self::State) { + // SAFETY: The `ptr` pointer is guaranteed to be valid and initial= ized before use. + unsafe { bindings::spin_assert_is_held(ptr) } + } +} + +#[kunit_tests(rust_spinlock_irq_condvar)] +mod tests { + use super::*; + use crate::{ + sync::*, + workqueue::{self, impl_has_work, new_work, Work, WorkItem}, + }; + + struct TestState { + value: u32, + waiter_ready: bool, + } + + #[pin_data] + struct Test { + #[pin] + state: SpinLockIrq, + + #[pin] + state_changed: CondVar, + + #[pin] + waiter_state_changed: CondVar, + + #[pin] + wait_work: Work, + } + + impl_has_work! { + impl HasWork for Test { self.wait_work } + } + + impl Test { + pub(crate) fn new() -> Result> { + Arc::try_pin_init( + try_pin_init!( + Self { + state <- new_spinlock_irq!(TestState { + value: 1, + waiter_ready: false + }), + state_changed <- new_condvar!(), + waiter_state_changed <- new_condvar!(), + wait_work <- new_work!("IrqCondvarTest::wait_work") + } + ), + GFP_KERNEL, + ) + } + } + + impl WorkItem for Test { + type Pointer =3D Arc; 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charset="utf-8" Now that we've introduced an `InterruptDisabled` token for marking contexts in which IRQs are disabled, we can have a way to avoid `SpinLockIrq` disabling interrupts if the interrupts have already been disabled. Basically, a `SpinLockIrq` should work like a `SpinLock` if interrupts are disabled. So a function: (&'a SpinLockIrq, &'a InterruptDisabled) -> Guard<'a, .., SpinLockBackend> makes senses. Note that due to `Guard` and `InterruptDisabled` having the same lifetime, interrupts cannot be enabled while the Guard exists. Add a `lock_with()` interface for `Lock`, and an associate type of `Backend` to describe the context. Signed-off-by: Lyude Paul Co-developed-by: Boqun Feng Signed-off-by: Boqun Feng --- V10: - Fix typos - Dirk --- rust/kernel/sync/lock.rs | 12 +++++++++++- rust/kernel/sync/lock/mutex.rs | 1 + rust/kernel/sync/lock/spinlock.rs | 4 +++- 3 files changed, 15 insertions(+), 2 deletions(-) diff --git a/rust/kernel/sync/lock.rs b/rust/kernel/sync/lock.rs index e82fa5be289c1..f94ed1a825f6d 100644 --- a/rust/kernel/sync/lock.rs +++ b/rust/kernel/sync/lock.rs @@ -44,6 +44,9 @@ pub unsafe trait Backend { /// [`unlock`]: Backend::unlock type GuardState; =20 + /// The context which can be provided to acquire the lock with a diffe= rent backend. + type Context<'a>; + /// Initialises the lock. /// /// # Safety @@ -163,8 +166,15 @@ pub unsafe fn from_raw<'a>(ptr: *mut B::State) -> &'a = Self { } =20 impl Lock { + /// Acquires the lock with the given context and gives the caller acce= ss to the data protected + /// by it. + pub fn lock_with<'a>(&'a self, _context: B::Context<'a>) -> Guard<'a, = T, B> { + todo!() + } + /// Acquires the lock and gives the caller access to the data protecte= d by it. - pub fn lock(&self) -> Guard<'_, T, B> { + #[inline] + pub fn lock<'a>(&'a self) -> Guard<'a, T, B> { // SAFETY: The constructor of the type calls `init`, so the existe= nce of the object proves // that `init` was called. let state =3D unsafe { B::lock(self.state.get()) }; diff --git a/rust/kernel/sync/lock/mutex.rs b/rust/kernel/sync/lock/mutex.rs index 581cee7ab842a..be1e2e18cf42d 100644 --- a/rust/kernel/sync/lock/mutex.rs +++ b/rust/kernel/sync/lock/mutex.rs @@ -101,6 +101,7 @@ macro_rules! new_mutex { unsafe impl super::Backend for MutexBackend { type State =3D bindings::mutex; type GuardState =3D (); + type Context<'a> =3D (); =20 unsafe fn init( ptr: *mut Self::State, diff --git a/rust/kernel/sync/lock/spinlock.rs b/rust/kernel/sync/lock/spin= lock.rs index 6e6d571acd90c..73a7ec554baac 100644 --- a/rust/kernel/sync/lock/spinlock.rs +++ b/rust/kernel/sync/lock/spinlock.rs @@ -3,7 +3,7 @@ //! A kernel spinlock. //! //! This module allows Rust code to use the kernel's `spinlock_t`. -use crate::prelude::*; +use crate::{interrupt::LocalInterruptDisabled, prelude::*}; =20 /// Creates a [`SpinLock`] initialiser with the given name and a newly-cre= ated lock class. /// @@ -101,6 +101,7 @@ macro_rules! new_spinlock { unsafe impl super::Backend for SpinLockBackend { type State =3D bindings::spinlock_t; type GuardState =3D (); + type Context<'a> =3D (); =20 unsafe fn init( ptr: *mut Self::State, @@ -243,6 +244,7 @@ macro_rules! new_spinlock_irq { unsafe impl super::Backend for SpinLockIrqBackend { type State =3D bindings::spinlock_t; type GuardState =3D (); + type Context<'a> =3D &'a LocalInterruptDisabled; =20 unsafe fn init( ptr: *mut Self::State, --=20 2.50.0 From nobody Mon Oct 6 19:07:10 2025 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 20D952080E8 for ; 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charset="utf-8" From: Boqun Feng `SpinLock`'s backend can be used for `SpinLockIrq`, if the interrupts are disabled. And it actually provides performance gains since interrupts are not needed to be disabled anymore. So add `Backend::BackendInContext` to describe the case where one backend can be used for another. Use it to implement the `lock_with()` so that `SpinLockIrq` can avoid disabling interrupts by using `SpinLock`'s backend. Signed-off-by: Boqun Feng Co-developed-by: Lyude Paul Signed-off-by: Lyude Paul --- V10: * Fix typos - Dirk/Lyude * Since we're adding support for context locks to GlobalLock as well, let's also make sure to cover try_lock while we're at it and add try_lock_with * Add a private function as_lock_in_context() for handling casting from a Lock to Lock so we don't have to duplicate safety comments V11: * Fix clippy::ref_as_ptr error in Lock::as_lock_in_context() Signed-off-by: Lyude Paul --- rust/kernel/sync/lock.rs | 61 ++++++++++++++++++++++++++++++- rust/kernel/sync/lock/mutex.rs | 1 + rust/kernel/sync/lock/spinlock.rs | 41 +++++++++++++++++++++ 3 files changed, 101 insertions(+), 2 deletions(-) diff --git a/rust/kernel/sync/lock.rs b/rust/kernel/sync/lock.rs index f94ed1a825f6d..7368c5ea824a6 100644 --- a/rust/kernel/sync/lock.rs +++ b/rust/kernel/sync/lock.rs @@ -30,10 +30,15 @@ /// is owned, that is, between calls to [`lock`] and [`unlock`]. /// - Implementers must also ensure that [`relock`] uses the same locking = method as the original /// lock operation. +/// - Implementers must ensure if [`BackendInContext`] is a [`Backend`], i= t's safe to acquire the +/// lock under the [`Context`], the [`State`] of two backends must be th= e same. /// /// [`lock`]: Backend::lock /// [`unlock`]: Backend::unlock /// [`relock`]: Backend::relock +/// [`BackendInContext`]: Backend::BackendInContext +/// [`Context`]: Backend::Context +/// [`State`]: Backend::State pub unsafe trait Backend { /// The state required by the lock. type State; @@ -47,6 +52,9 @@ pub unsafe trait Backend { /// The context which can be provided to acquire the lock with a diffe= rent backend. type Context<'a>; =20 + /// The alternative backend we can use if a [`Context`](Backend::Conte= xt) is provided. + type BackendInContext: Sized; + /// Initialises the lock. /// /// # Safety @@ -166,10 +174,59 @@ pub unsafe fn from_raw<'a>(ptr: *mut B::State) -> &'a= Self { } =20 impl Lock { + /// Casts the lock as a `Lock`. + fn as_lock_in_context<'a>( + &'a self, + _context: B::Context<'a>, + ) -> &'a Lock + where + B::BackendInContext: Backend, + { + // SAFETY: + // - Per the safety guarantee of `Backend`, if `B::BackendInContex= t` and `B` should + // have the same state, the layout of the lock is the same so it= 's safe to convert one to + // another. + // - The caller provided `B::Context<'a>`, so it is safe to recast= and return this lock. + unsafe { &*(core::ptr::from_ref(self) as *const _) } + } + /// Acquires the lock with the given context and gives the caller acce= ss to the data protected /// by it. - pub fn lock_with<'a>(&'a self, _context: B::Context<'a>) -> Guard<'a, = T, B> { - todo!() + pub fn lock_with<'a>(&'a self, context: B::Context<'a>) -> Guard<'a, T= , B::BackendInContext> + where + B::BackendInContext: Backend, + { + let lock =3D self.as_lock_in_context(context); + + // SAFETY: The constructor of the type calls `init`, so the existe= nce of the object proves + // that `init` was called. Plus the safety guarantee of `Backend` = guarantees that `B::State` + // is the same as `B::BackendInContext::State`, also it's safe to = call another backend + // because there is `B::Context<'a>`. + let state =3D unsafe { B::BackendInContext::lock(lock.state.get())= }; + + // SAFETY: The lock was just acquired. + unsafe { Guard::new(lock, state) } + } + + /// Tries to acquire the lock with the given context. + /// + /// Returns a guard that can be used to access the data protected by t= he lock if successful. + pub fn try_lock_with<'a>( + &'a self, + context: B::Context<'a>, + ) -> Option> + where + B::BackendInContext: Backend, + { + let lock =3D self.as_lock_in_context(context); + + // SAFETY: The constructor of the type calls `init`, so the existe= nce of the object proves + // that `init` was called. Plus the safety guarantee of `Backend` = guarantees that `B::State` + // is the same as `B::BackendInContext::State`, also it's safe to = call another backend + // because there is `B::Context<'a>`. + unsafe { + B::BackendInContext::try_lock(lock.state.get()).map(|state| Gu= ard::new(lock, state)) + } } =20 /// Acquires the lock and gives the caller access to the data protecte= d by it. diff --git a/rust/kernel/sync/lock/mutex.rs b/rust/kernel/sync/lock/mutex.rs index be1e2e18cf42d..662a530750703 100644 --- a/rust/kernel/sync/lock/mutex.rs +++ b/rust/kernel/sync/lock/mutex.rs @@ -102,6 +102,7 @@ unsafe impl super::Backend for MutexBackend { type State =3D bindings::mutex; type GuardState =3D (); type Context<'a> =3D (); + type BackendInContext =3D (); =20 unsafe fn init( ptr: *mut Self::State, diff --git a/rust/kernel/sync/lock/spinlock.rs b/rust/kernel/sync/lock/spin= lock.rs index 73a7ec554baac..68cbd225c3860 100644 --- a/rust/kernel/sync/lock/spinlock.rs +++ b/rust/kernel/sync/lock/spinlock.rs @@ -102,6 +102,7 @@ unsafe impl super::Backend for SpinLockBackend { type State =3D bindings::spinlock_t; type GuardState =3D (); type Context<'a> =3D (); + type BackendInContext =3D (); =20 unsafe fn init( ptr: *mut Self::State, @@ -221,6 +222,45 @@ macro_rules! new_spinlock_irq { /// # Ok::<(), Error>(()) /// ``` /// +/// The next example demonstrates locking a [`SpinLockIrq`] using [`lock_w= ith()`] in a function +/// which can only be called when local processor interrupts are already d= isabled. +/// +/// ``` +/// use kernel::sync::{new_spinlock_irq, SpinLockIrq}; +/// use kernel::interrupt::*; +/// +/// struct Inner { +/// a: u32, +/// } +/// +/// #[pin_data] +/// struct Example { +/// #[pin] +/// inner: SpinLockIrq, +/// } +/// +/// impl Example { +/// fn new() -> impl PinInit { +/// pin_init!(Self { +/// inner <- new_spinlock_irq!(Inner { a: 20 }), +/// }) +/// } +/// } +/// +/// // Accessing an `Example` from a function that can only be called in n= o-interrupt contexts. +/// fn noirq_work(e: &Example, interrupt_disabled: &LocalInterruptDisabled= ) { +/// // Because we know interrupts are disabled from interrupt_disable,= we can skip toggling +/// // interrupt state using lock_with() and the provided token +/// assert_eq!(e.inner.lock_with(interrupt_disabled).a, 20); +/// } +/// +/// # let e =3D KBox::pin_init(Example::new(), GFP_KERNEL)?; +/// # let interrupt_guard =3D local_interrupt_disable(); +/// # noirq_work(&e, &interrupt_guard); +/// # +/// # Ok::<(), Error>(()) +/// ``` +/// /// [`lock()`]: SpinLockIrq::lock /// [`lock_with()`]: SpinLockIrq::lock_with pub type SpinLockIrq =3D super::Lock; @@ -245,6 +285,7 @@ unsafe impl super::Backend for SpinLockIrqBackend { type State =3D bindings::spinlock_t; type GuardState =3D (); type Context<'a> =3D &'a LocalInterruptDisabled; + type BackendInContext =3D SpinLockBackend; =20 unsafe fn init( ptr: *mut Self::State, --=20 2.50.0 From nobody Mon Oct 6 19:07:10 2025 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id CBBCC20E334 for ; Thu, 17 Jul 2025 18:43:50 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; 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charset="utf-8" While a GlobalLock is always going to be static, in the case of locks with explicit backend contexts the GlobalGuard will not be 'static and will instead share the lifetime of the context. So, add a lifetime parameter to GlobalGuard to allow for this so we can implement GlobalGuard support for SpinlockIrq. Signed-off-by: Lyude Paul --- rust/kernel/sync/lock/global.rs | 58 ++++++++++++++++----------------- 1 file changed, 29 insertions(+), 29 deletions(-) diff --git a/rust/kernel/sync/lock/global.rs b/rust/kernel/sync/lock/global= .rs index 47e200b750c1d..f846ecf9168e7 100644 --- a/rust/kernel/sync/lock/global.rs +++ b/rust/kernel/sync/lock/global.rs @@ -33,18 +33,18 @@ pub trait GlobalLockBackend { /// Type used for global locks. /// /// See [`global_lock!`] for examples. -pub struct GlobalLock { - inner: Lock, +pub struct GlobalLock { + inner: Lock, } =20 -impl GlobalLock { +impl GlobalLock { /// Creates a global lock. /// /// # Safety /// /// * Before any other method on this lock is called, [`Self::init`] m= ust be called. - /// * The type `B` must not be used with any other lock. - pub const unsafe fn new(data: B::Item) -> Self { + /// * The type `G` must not be used with any other lock. + pub const unsafe fn new(data: G::Item) -> Self { Self { inner: Lock { state: Opaque::uninit(), @@ -68,23 +68,23 @@ pub unsafe fn init(&'static self) { // `init` before using any other methods. As `init` can only be ca= lled once, all other // uses of this lock must happen after this call. unsafe { - B::Backend::init( + G::Backend::init( self.inner.state.get(), - B::NAME.as_char_ptr(), - B::get_lock_class().as_ptr(), + G::NAME.as_char_ptr(), + G::get_lock_class().as_ptr(), ) } } =20 /// Lock this global lock. - pub fn lock(&'static self) -> GlobalGuard { + pub fn lock(&'static self) -> GlobalGuard<'static, G> { GlobalGuard { inner: self.inner.lock(), } } =20 /// Try to lock this global lock. - pub fn try_lock(&'static self) -> Option> { + pub fn try_lock(&'static self) -> Option> { Some(GlobalGuard { inner: self.inner.try_lock()?, }) @@ -94,19 +94,19 @@ pub fn try_lock(&'static self) -> Option= > { /// A guard for a [`GlobalLock`]. /// /// See [`global_lock!`] for examples. -pub struct GlobalGuard { - inner: Guard<'static, B::Item, B::Backend>, +pub struct GlobalGuard<'a, G: GlobalLockBackend> { + inner: Guard<'a, G::Item, G::Backend>, } =20 -impl core::ops::Deref for GlobalGuard { - type Target =3D B::Item; +impl<'a, G: GlobalLockBackend> core::ops::Deref for GlobalGuard<'a, G> { + type Target =3D G::Item; =20 fn deref(&self) -> &Self::Target { &self.inner } } =20 -impl core::ops::DerefMut for GlobalGuard { +impl<'a, G: GlobalLockBackend> core::ops::DerefMut for GlobalGuard<'a, G> { fn deref_mut(&mut self) -> &mut Self::Target { &mut self.inner } @@ -115,33 +115,33 @@ fn deref_mut(&mut self) -> &mut Self::Target { /// A version of [`LockedBy`] for a [`GlobalLock`]. /// /// See [`global_lock!`] for examples. -pub struct GlobalLockedBy { - _backend: PhantomData, +pub struct GlobalLockedBy { + _backend: PhantomData, value: UnsafeCell, } =20 // SAFETY: The same thread-safety rules as `LockedBy` apply to `GlobalLock= edBy`. -unsafe impl Send for GlobalLockedBy +unsafe impl Send for GlobalLockedBy where T: ?Sized, - B: GlobalLockBackend, - LockedBy: Send, + G: GlobalLockBackend, + LockedBy: Send, { } =20 // SAFETY: The same thread-safety rules as `LockedBy` apply to `GlobalLock= edBy`. -unsafe impl Sync for GlobalLockedBy +unsafe impl Sync for GlobalLockedBy where T: ?Sized, - B: GlobalLockBackend, - LockedBy: Sync, + G: GlobalLockBackend, + LockedBy: Sync, { } =20 -impl GlobalLockedBy { +impl GlobalLockedBy { /// Create a new [`GlobalLockedBy`]. /// - /// The provided value will be protected by the global lock indicated = by `B`. + /// The provided value will be protected by the global lock indicated = by `G`. pub fn new(val: T) -> Self { Self { value: UnsafeCell::new(val), @@ -150,11 +150,11 @@ pub fn new(val: T) -> Self { } } =20 -impl GlobalLockedBy { +impl GlobalLockedBy { /// Access the value immutably. /// /// The caller must prove shared access to the lock. - pub fn as_ref<'a>(&'a self, _guard: &'a GlobalGuard) -> &'a T { + pub fn as_ref<'a>(&'a self, _guard: &'a GlobalGuard<'_, G>) -> &'a T { // SAFETY: The lock is globally unique, so there can only be one g= uard. unsafe { &*self.value.get() } } @@ -162,7 +162,7 @@ pub fn as_ref<'a>(&'a self, _guard: &'a GlobalGuard)= -> &'a T { /// Access the value mutably. /// /// The caller must prove shared exclusive to the lock. - pub fn as_mut<'a>(&'a self, _guard: &'a mut GlobalGuard) -> &'a mut= T { + pub fn as_mut<'a>(&'a self, _guard: &'a mut GlobalGuard<'_, G>) -> &'a= mut T { // SAFETY: The lock is globally unique, so there can only be one g= uard. unsafe { &mut *self.value.get() } } @@ -232,7 +232,7 @@ pub fn get_mut(&mut self) -> &mut T { /// /// Increment the counter in this instance. /// /// /// /// The caller must hold the `MY_MUTEX` mutex. -/// fn increment(&self, guard: &mut GlobalGuard) -> u32 { +/// fn increment(&self, guard: &mut GlobalGuard<'_, MY_MUTEX>) -> u32 { /// let my_counter =3D self.my_counter.as_mut(guard); 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Thu, 17 Jul 2025 14:43:52 -0400 X-MC-Unique: rjP8F9YsMoCY8gWxuuR4mg-1 X-Mimecast-MFC-AGG-ID: rjP8F9YsMoCY8gWxuuR4mg_1752777830 Received: from mx-prod-int-08.mail-002.prod.us-west-2.aws.redhat.com (mx-prod-int-08.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.111]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mx-prod-mc-08.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id 149B71800D82; Thu, 17 Jul 2025 18:43:50 +0000 (UTC) Received: from chopper.redhat.com (unknown [10.22.66.69]) by mx-prod-int-08.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTP id C8A431801712; Thu, 17 Jul 2025 18:43:46 +0000 (UTC) From: Lyude Paul To: rust-for-linux@vger.kernel.org, Thomas Gleixner , Boqun Feng , linux-kernel@vger.kernel.org, Daniel Almeida Cc: Miguel Ojeda , Alex Gaynor , Gary Guo , =?UTF-8?q?Bj=C3=B6rn=20Roy=20Baron?= , Benno Lossin , Andreas Hindborg , Alice Ryhl , Trevor Gross , Danilo Krummrich , Mitchell Levy , Viresh Kumar , Wedson Almeida Filho Subject: [PATCH v11 11/14] rust: sync: Expose lock::Backend Date: Thu, 17 Jul 2025 14:38:03 -0400 Message-ID: <20250717184055.2071216-12-lyude@redhat.com> In-Reply-To: <20250717184055.2071216-1-lyude@redhat.com> References: <20250717184055.2071216-1-lyude@redhat.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 3.4.1 on 10.30.177.111 Content-Type: text/plain; charset="utf-8" Due to the addition of sync::lock::Backend::Context, lock guards can be returned with a different Backend than their respective lock. Since we'll be adding a trait bound for Backend to GlobalGuard in order to support this, users will need to be able to directly refer to Backend so that they can use it in trait bounds. So, let's make this easier for users and expose Backend in sync. Signed-off-by: Lyude Paul --- rust/kernel/sync.rs | 1 + 1 file changed, 1 insertion(+) diff --git a/rust/kernel/sync.rs b/rust/kernel/sync.rs index f1e448e096ea9..ebf004193bca5 100644 --- a/rust/kernel/sync.rs +++ b/rust/kernel/sync.rs @@ -25,6 +25,7 @@ pub use lock::spinlock::{ new_spinlock, new_spinlock_irq, SpinLock, SpinLockGuard, SpinLockIrq, = SpinLockIrqGuard, }; +pub use lock::Backend; pub use locked_by::LockedBy; =20 /// Represents a lockdep class. It's a wrapper around C's `lock_class_key`. --=20 2.50.0 From nobody Mon Oct 6 19:07:10 2025 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id BC11720E715 for ; Thu, 17 Jul 2025 18:44:03 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=170.10.129.124 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1752777845; cv=none; b=uQpF021gl3A1/M2lNOYSviD94uR8xYPdwIf9QVE1biGlptNgjg35vOS0aNpiAKAG9lE3bSo+ioGlXaQnnwpbV7G8Q46XOTZAuoOPDsAXjiWRLxZAvbUHd2uzfyPvIOsltD382l1vzDHknYWU7Ld+KUAXVPyOW4+epiLOOCSqROg= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1752777845; c=relaxed/simple; bh=KhyXpdrnNRmZJArqvpnD6zxS4VpNg0NEmUn14oARH58=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=ezG/63hPfpNb62+xZMGoXVtNJyZP8Ud2aYbYiqZC+iELBqARI8vs7o+b1F7XpSPXweMcmr5M56bptSJmNdMZFEEMgxF1ySsRBKfiEIJO6ly6XlSrcfdm1ofgvnCKiB1o7LdekueYXjvrwGS3bDj4wrNFwFmF3kMAyjTNlNkowS4= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=redhat.com; spf=pass smtp.mailfrom=redhat.com; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b=bLzKCYc7; arc=none smtp.client-ip=170.10.129.124 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=redhat.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=redhat.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="bLzKCYc7" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1752777843; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=ikpxnE4FqOnYzLdJmrDCnds8Pt84GEOTjPbssWEskjg=; b=bLzKCYc7SCQum+Ubzrzh8axOJMw768cAMxk5q7jezWSAsajEcbKKqbXCv3aykpoQKx+lE1 7pZF3s2IZ13D/bRcaqyfF8WjzQ+jhJNH35CT3h1W8KcEyGerzla7hE636DruGBoI7KarhS gNEa8cOzyzpr9oCOAFlTaUXWxOVeVQY= Received: from mx-prod-mc-03.mail-002.prod.us-west-2.aws.redhat.com (ec2-54-186-198-63.us-west-2.compute.amazonaws.com [54.186.198.63]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-173-mp_ApW7aN-KlrzbkY95wmA-1; Thu, 17 Jul 2025 14:43:59 -0400 X-MC-Unique: mp_ApW7aN-KlrzbkY95wmA-1 X-Mimecast-MFC-AGG-ID: mp_ApW7aN-KlrzbkY95wmA_1752777837 Received: from mx-prod-int-01.mail-002.prod.us-west-2.aws.redhat.com (mx-prod-int-01.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.4]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mx-prod-mc-03.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id 32EBF197730A; Thu, 17 Jul 2025 18:43:57 +0000 (UTC) Received: from chopper.redhat.com (unknown [10.22.66.69]) by mx-prod-int-01.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTP id 2450930001B1; Thu, 17 Jul 2025 18:43:51 +0000 (UTC) From: Lyude Paul To: rust-for-linux@vger.kernel.org, Thomas Gleixner , Boqun Feng , linux-kernel@vger.kernel.org, Daniel Almeida Cc: Peter Zijlstra , Ingo Molnar , Will Deacon , Waiman Long , Miguel Ojeda , Alex Gaynor , Gary Guo , =?UTF-8?q?Bj=C3=B6rn=20Roy=20Baron?= , Benno Lossin , Andreas Hindborg , Alice Ryhl , Trevor Gross , Danilo Krummrich Subject: [PATCH v11 12/14] rust: sync: lock/global: Add Backend parameter to GlobalGuard Date: Thu, 17 Jul 2025 14:38:04 -0400 Message-ID: <20250717184055.2071216-13-lyude@redhat.com> In-Reply-To: <20250717184055.2071216-1-lyude@redhat.com> References: <20250717184055.2071216-1-lyude@redhat.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 3.4.1 on 10.30.177.4 Content-Type: text/plain; charset="utf-8" Due to the introduction of sync::lock::Backend::Context, it's now possible for normal locks to return a Guard with a different Backend than their respective lock (e.g. Backend::BackendInContext). We want to be able to support global locks with contexts as well, so add a trait bound to explicitly specify which Backend is in use for a GlobalGuard. Signed-off-by: Lyude Paul --- rust/kernel/sync/lock/global.rs | 20 ++++++++++---------- 1 file changed, 10 insertions(+), 10 deletions(-) diff --git a/rust/kernel/sync/lock/global.rs b/rust/kernel/sync/lock/global= .rs index f846ecf9168e7..f9a9c4bdc46b0 100644 --- a/rust/kernel/sync/lock/global.rs +++ b/rust/kernel/sync/lock/global.rs @@ -77,14 +77,14 @@ pub unsafe fn init(&'static self) { } =20 /// Lock this global lock. - pub fn lock(&'static self) -> GlobalGuard<'static, G> { + pub fn lock(&'static self) -> GlobalGuard<'static, G, G::Backend> { GlobalGuard { inner: self.inner.lock(), } } =20 /// Try to lock this global lock. - pub fn try_lock(&'static self) -> Option> { + pub fn try_lock(&'static self) -> Option> { Some(GlobalGuard { inner: self.inner.try_lock()?, }) @@ -94,11 +94,11 @@ pub fn try_lock(&'static self) -> Option> { /// A guard for a [`GlobalLock`]. /// /// See [`global_lock!`] for examples. -pub struct GlobalGuard<'a, G: GlobalLockBackend> { - inner: Guard<'a, G::Item, G::Backend>, +pub struct GlobalGuard<'a, G: GlobalLockBackend, B: Backend> { + inner: Guard<'a, G::Item, B>, } =20 -impl<'a, G: GlobalLockBackend> core::ops::Deref for GlobalGuard<'a, G> { +impl<'a, G: GlobalLockBackend, B: Backend> core::ops::Deref for GlobalGuar= d<'a, G, B> { type Target =3D G::Item; =20 fn deref(&self) -> &Self::Target { @@ -106,7 +106,7 @@ fn deref(&self) -> &Self::Target { } } =20 -impl<'a, G: GlobalLockBackend> core::ops::DerefMut for GlobalGuard<'a, G> { +impl<'a, G: GlobalLockBackend, B: Backend> core::ops::DerefMut for GlobalG= uard<'a, G, B> { fn deref_mut(&mut self) -> &mut Self::Target { &mut self.inner } @@ -154,7 +154,7 @@ impl GlobalLockedBy { /// Access the value immutably. /// /// The caller must prove shared access to the lock. - pub fn as_ref<'a>(&'a self, _guard: &'a GlobalGuard<'_, G>) -> &'a T { + pub fn as_ref<'a, B: Backend>(&'a self, _guard: &'a GlobalGuard<'_, G,= B>) -> &'a T { // SAFETY: The lock is globally unique, so there can only be one g= uard. unsafe { &*self.value.get() } } @@ -162,7 +162,7 @@ pub fn as_ref<'a>(&'a self, _guard: &'a GlobalGuard<'_,= G>) -> &'a T { /// Access the value mutably. /// /// The caller must prove shared exclusive to the lock. - pub fn as_mut<'a>(&'a self, _guard: &'a mut GlobalGuard<'_, G>) -> &'a= mut T { + pub fn as_mut<'a, B: Backend>(&'a self, _guard: &'a mut GlobalGuard<'_= , G, B>) -> &'a mut T { // SAFETY: The lock is globally unique, so there can only be one g= uard. unsafe { &mut *self.value.get() } } @@ -216,7 +216,7 @@ pub fn get_mut(&mut self) -> &mut T { /// ``` /// # mod ex { /// # use kernel::prelude::*; -/// use kernel::sync::{GlobalGuard, GlobalLockedBy}; +/// use kernel::sync::{Backend, GlobalGuard, GlobalLockedBy}; /// /// kernel::sync::global_lock! 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Signed-off-by: Lyude Paul --- rust/kernel/sync/lock/global.rs | 28 ++++++++++++++++++++++++++++ 1 file changed, 28 insertions(+) diff --git a/rust/kernel/sync/lock/global.rs b/rust/kernel/sync/lock/global= .rs index f9a9c4bdc46b0..1f28bf5fc8851 100644 --- a/rust/kernel/sync/lock/global.rs +++ b/rust/kernel/sync/lock/global.rs @@ -89,6 +89,34 @@ pub fn try_lock(&'static self) -> Option> { inner: self.inner.try_lock()?, }) } + + /// Lock this global lock with the provided `context`. + pub fn lock_with<'a, B>( + &'static self, + context: ::Context<'a>, + ) -> GlobalGuard<'a, G, B> + where + G::Backend: Backend, + B: Backend, + { + GlobalGuard { + inner: self.inner.lock_with(context), + } + } + + /// Try to lock this global lock with the provided `context`. + pub fn try_lock_with<'a, B>( + &'static self, + context: ::Context<'a>, + ) -> Option> + where + G::Backend: Backend, + B: Backend, + { + Some(GlobalGuard { + inner: self.inner.try_lock_with(context)?, + }) + } } =20 /// A guard for a [`GlobalLock`]. --=20 2.50.0 From nobody Mon Oct 6 19:07:10 2025 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 7968E20E715 for ; 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Thu, 17 Jul 2025 14:44:06 -0400 X-MC-Unique: idqioOuHOvyPbzxE4VeyBw-1 X-Mimecast-MFC-AGG-ID: idqioOuHOvyPbzxE4VeyBw_1752777844 Received: from mx-prod-int-01.mail-002.prod.us-west-2.aws.redhat.com (mx-prod-int-01.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.4]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mx-prod-mc-08.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id 359DC1800368; Thu, 17 Jul 2025 18:44:04 +0000 (UTC) Received: from chopper.redhat.com (unknown [10.22.66.69]) by mx-prod-int-01.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTP id CFD6230001B1; Thu, 17 Jul 2025 18:44:01 +0000 (UTC) From: Lyude Paul To: rust-for-linux@vger.kernel.org, Thomas Gleixner , Boqun Feng , linux-kernel@vger.kernel.org, Daniel Almeida Cc: Peter Zijlstra , Ingo Molnar , Will Deacon , Waiman Long , Sebastian Andrzej Siewior , Clark Williams , Steven Rostedt , linux-rt-devel@lists.linux.dev (open list:Real-time Linux (PREEMPT_RT):Keyword:PREEMPT_RT) Subject: [PATCH v11 14/14] locking: Switch to _irq_{disable,enable}() variants in cleanup guards Date: Thu, 17 Jul 2025 14:38:06 -0400 Message-ID: <20250717184055.2071216-15-lyude@redhat.com> In-Reply-To: <20250717184055.2071216-1-lyude@redhat.com> References: <20250717184055.2071216-1-lyude@redhat.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 3.4.1 on 10.30.177.4 Content-Type: text/plain; charset="utf-8" From: Boqun Feng The semantics of various irq disabling guards match what *_irq_{disable,enable}() provide, i.e. the interrupt disabling is properly nested, therefore it's OK to switch to use *_irq_{disable,enable}() primitives. Signed-off-by: Boqun Feng Signed-off-by: Lyude Paul --- V10: * Add PREEMPT_RT build fix from Guangbo Cui --- include/linux/spinlock.h | 26 ++++++++++++-------------- 1 file changed, 12 insertions(+), 14 deletions(-) diff --git a/include/linux/spinlock.h b/include/linux/spinlock.h index b21da4bd51a42..7ff11c893940b 100644 --- a/include/linux/spinlock.h +++ b/include/linux/spinlock.h @@ -605,10 +605,10 @@ DEFINE_LOCK_GUARD_1(raw_spinlock_nested, raw_spinlock= _t, raw_spin_unlock(_T->lock)) =20 DEFINE_LOCK_GUARD_1(raw_spinlock_irq, raw_spinlock_t, - raw_spin_lock_irq(_T->lock), - raw_spin_unlock_irq(_T->lock)) + raw_spin_lock_irq_disable(_T->lock), + raw_spin_unlock_irq_enable(_T->lock)) =20 -DEFINE_LOCK_GUARD_1_COND(raw_spinlock_irq, _try, raw_spin_trylock_irq(_T->= lock)) +DEFINE_LOCK_GUARD_1_COND(raw_spinlock_irq, _try, raw_spin_trylock_irq_disa= ble(_T->lock)) =20 DEFINE_LOCK_GUARD_1(raw_spinlock_bh, raw_spinlock_t, raw_spin_lock_bh(_T->lock), @@ -617,12 +617,11 @@ DEFINE_LOCK_GUARD_1(raw_spinlock_bh, raw_spinlock_t, DEFINE_LOCK_GUARD_1_COND(raw_spinlock_bh, _try, raw_spin_trylock_bh(_T->lo= ck)) =20 DEFINE_LOCK_GUARD_1(raw_spinlock_irqsave, raw_spinlock_t, - raw_spin_lock_irqsave(_T->lock, _T->flags), - raw_spin_unlock_irqrestore(_T->lock, _T->flags), - unsigned long flags) + raw_spin_lock_irq_disable(_T->lock), + raw_spin_unlock_irq_enable(_T->lock)) =20 DEFINE_LOCK_GUARD_1_COND(raw_spinlock_irqsave, _try, - raw_spin_trylock_irqsave(_T->lock, _T->flags)) + raw_spin_trylock_irq_disable(_T->lock)) =20 DEFINE_LOCK_GUARD_1(spinlock, spinlock_t, spin_lock(_T->lock), @@ -631,11 +630,11 @@ DEFINE_LOCK_GUARD_1(spinlock, spinlock_t, DEFINE_LOCK_GUARD_1_COND(spinlock, _try, spin_trylock(_T->lock)) =20 DEFINE_LOCK_GUARD_1(spinlock_irq, spinlock_t, - spin_lock_irq(_T->lock), - spin_unlock_irq(_T->lock)) + spin_lock_irq_disable(_T->lock), + spin_unlock_irq_enable(_T->lock)) =20 DEFINE_LOCK_GUARD_1_COND(spinlock_irq, _try, - spin_trylock_irq(_T->lock)) + spin_trylock_irq_disable(_T->lock)) =20 DEFINE_LOCK_GUARD_1(spinlock_bh, spinlock_t, spin_lock_bh(_T->lock), @@ -645,12 +644,11 @@ DEFINE_LOCK_GUARD_1_COND(spinlock_bh, _try, spin_trylock_bh(_T->lock)) =20 DEFINE_LOCK_GUARD_1(spinlock_irqsave, spinlock_t, - spin_lock_irqsave(_T->lock, _T->flags), - spin_unlock_irqrestore(_T->lock, _T->flags), - unsigned long flags) + spin_lock_irq_disable(_T->lock), + spin_unlock_irq_enable(_T->lock)) =20 DEFINE_LOCK_GUARD_1_COND(spinlock_irqsave, _try, - spin_trylock_irqsave(_T->lock, _T->flags)) + spin_trylock_irq_disable(_T->lock)) =20 DEFINE_LOCK_GUARD_1(read_lock, rwlock_t, read_lock(_T->lock), --=20 2.50.0