From nobody Thu Dec 18 18:19:12 2025 Received: from galois.linutronix.de (Galois.linutronix.de [193.142.43.55]) (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 7AF11269D16 for ; Thu, 13 Mar 2025 15:59:47 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=193.142.43.55 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1741881589; cv=none; b=kbcMrIR9PlNUcc5pZF/MfFI6LFM2lUI1SqCbahlfd8DeO2tLXbmlbBWHBn21ShpZWfSzHzLAwsufFqjf4uV+J3K3X7Xm27nVxF3z4zz6EZFtZs9yRoCTJJvxTfQUWLGNhLw7jvD1b9h+0MYrsAEjBpsgVLqWcrPNCr0b533S/9I= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1741881589; c=relaxed/simple; bh=IVJhpYURztDJOZBABhyAoqcfzgKz3pCP/FdaRTf/1WA=; h=Message-ID:From:To:Cc:Subject:References:MIME-Version: Content-Type:Date; b=es3dDL9O29wUZc6EMS5tzrRSwzl98KTEcYvFhlpPFJekuJtJboWJMFoMydT2DvUedYP8qsIS/QM4agQ4rC75haDMVfV5csXk7Px6+AGMbGYU4mh49iK/mSyqXVDPV7yMILjiHuOniXa0qH7AnYAycNHKrzdJ1eA1su5R0ItcTPo= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linutronix.de; spf=pass smtp.mailfrom=linutronix.de; dkim=pass (2048-bit key) header.d=linutronix.de header.i=@linutronix.de header.b=2HqymcWp; dkim=permerror (0-bit key) header.d=linutronix.de header.i=@linutronix.de header.b=hHolmahl; arc=none smtp.client-ip=193.142.43.55 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linutronix.de Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linutronix.de Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="2HqymcWp"; dkim=permerror (0-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="hHolmahl" Message-ID: <20250313155914.010145118@linutronix.de> DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1741881585; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: references:references; bh=waJW3YQ5oWNwI/K62CwSIbV5Ipj5dQb2DRtTEC5iKXQ=; b=2HqymcWpAVP30QeTxkq309VWpnQRwT1EZs/jYZuMKe34hSpQBxBh6GBuXNwkSKBb7vrEWv tevFf7ATtnQBTeQz2P1eNJgQ2Cs+Dc02MYGr7YREOPmnSkVa4LOz9H175YFmw7ygrIznyd 4Na+493RquM0+VDxht0LyJ8XCZO27pKt0zkpQjn17bQ7F83zOSSqKN3uoZ1AUwpBvLAEMi PSvGiZXQxNpqeUDrzmPuZGfrsiqmKVAWgpJbveJUJKq5Ra7dJhH3LWWfqzWZ8xMCFr9dRl tXmkFz4a0Sg6xNQhwWpvXFe3/ZEShkyjXOB/oazQJktbgQX66XA7XQVNaFFAWw== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1741881585; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: references:references; bh=waJW3YQ5oWNwI/K62CwSIbV5Ipj5dQb2DRtTEC5iKXQ=; b=hHolmahlfg0z+gf36erbdveDBwhWLl4BwWoOAsmiG2dqn8CimNjClFhyMoQYord2zNrbi/ WCOBudo5kRVxQhAA== From: Thomas Gleixner To: LKML Cc: Peter Zijlstra , Jiri Slaby Subject: [patch 02/46] genirq/irqdesc: Switch to lock guards References: <20250313154615.860723120@linutronix.de> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Date: Thu, 13 Mar 2025 16:59:44 +0100 (CET) Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Replace all lock/unlock pairs with lock guards and simplify the code flow. No functional change. Signed-off-by: Thomas Gleixner --- kernel/irq/irqdesc.c | 136 +++++++++++++++-------------------------------= ----- 1 file changed, 42 insertions(+), 94 deletions(-) --- a/kernel/irq/irqdesc.c +++ b/kernel/irq/irqdesc.c @@ -266,104 +266,68 @@ static ssize_t per_cpu_count_show(struct } IRQ_ATTR_RO(per_cpu_count); =20 -static ssize_t chip_name_show(struct kobject *kobj, - struct kobj_attribute *attr, char *buf) +static ssize_t chip_name_show(struct kobject *kobj, struct kobj_attribute = *attr, char *buf) { struct irq_desc *desc =3D container_of(kobj, struct irq_desc, kobj); - ssize_t ret =3D 0; - - raw_spin_lock_irq(&desc->lock); - if (desc->irq_data.chip && desc->irq_data.chip->name) { - ret =3D scnprintf(buf, PAGE_SIZE, "%s\n", - desc->irq_data.chip->name); - } - raw_spin_unlock_irq(&desc->lock); =20 - return ret; + guard(raw_spinlock_irq)(&desc->lock); + if (desc->irq_data.chip && desc->irq_data.chip->name) + return scnprintf(buf, PAGE_SIZE, "%s\n", desc->irq_data.chip->name); + return 0; } IRQ_ATTR_RO(chip_name); =20 -static ssize_t hwirq_show(struct kobject *kobj, - struct kobj_attribute *attr, char *buf) +static ssize_t hwirq_show(struct kobject *kobj, struct kobj_attribute *att= r, char *buf) { struct irq_desc *desc =3D container_of(kobj, struct irq_desc, kobj); - ssize_t ret =3D 0; - - raw_spin_lock_irq(&desc->lock); - if (desc->irq_data.domain) - ret =3D sprintf(buf, "%lu\n", desc->irq_data.hwirq); - raw_spin_unlock_irq(&desc->lock); =20 - return ret; + guard(raw_spinlock_irq)(&desc->lock); + return desc->irq_data.domain ? sprintf(buf, "%lu\n", desc->irq_data.hwirq= ) : 0; } IRQ_ATTR_RO(hwirq); =20 -static ssize_t type_show(struct kobject *kobj, - struct kobj_attribute *attr, char *buf) +static ssize_t type_show(struct kobject *kobj, struct kobj_attribute *attr= , char *buf) { struct irq_desc *desc =3D container_of(kobj, struct irq_desc, kobj); - ssize_t ret =3D 0; - - raw_spin_lock_irq(&desc->lock); - ret =3D sprintf(buf, "%s\n", - irqd_is_level_type(&desc->irq_data) ? "level" : "edge"); - raw_spin_unlock_irq(&desc->lock); - - return ret; =20 + guard(raw_spinlock_irq)(&desc->lock); + return sprintf(buf, "%s\n", irqd_is_level_type(&desc->irq_data) ? "level"= : "edge"); } IRQ_ATTR_RO(type); =20 -static ssize_t wakeup_show(struct kobject *kobj, - struct kobj_attribute *attr, char *buf) +static ssize_t wakeup_show(struct kobject *kobj, struct kobj_attribute *at= tr, char *buf) { struct irq_desc *desc =3D container_of(kobj, struct irq_desc, kobj); - ssize_t ret =3D 0; - - raw_spin_lock_irq(&desc->lock); - ret =3D sprintf(buf, "%s\n", str_enabled_disabled(irqd_is_wakeup_set(&des= c->irq_data))); - raw_spin_unlock_irq(&desc->lock); - - return ret; =20 + guard(raw_spinlock_irq)(&desc->lock); + return sprintf(buf, "%s\n", str_enabled_disabled(irqd_is_wakeup_set(&desc= ->irq_data))); } IRQ_ATTR_RO(wakeup); =20 -static ssize_t name_show(struct kobject *kobj, - struct kobj_attribute *attr, char *buf) +static ssize_t name_show(struct kobject *kobj, struct kobj_attribute *attr= , char *buf) { struct irq_desc *desc =3D container_of(kobj, struct irq_desc, kobj); - ssize_t ret =3D 0; =20 - raw_spin_lock_irq(&desc->lock); - if (desc->name) - ret =3D scnprintf(buf, PAGE_SIZE, "%s\n", desc->name); - raw_spin_unlock_irq(&desc->lock); - - return ret; + guard(raw_spinlock_irq)(&desc->lock); + return desc->name ? scnprintf(buf, PAGE_SIZE, "%s\n", desc->name) : 0; } IRQ_ATTR_RO(name); =20 -static ssize_t actions_show(struct kobject *kobj, - struct kobj_attribute *attr, char *buf) +static ssize_t actions_show(struct kobject *kobj, struct kobj_attribute *a= ttr, char *buf) { struct irq_desc *desc =3D container_of(kobj, struct irq_desc, kobj); struct irqaction *action; ssize_t ret =3D 0; char *p =3D ""; =20 - raw_spin_lock_irq(&desc->lock); - for_each_action_of_desc(desc, action) { - ret +=3D scnprintf(buf + ret, PAGE_SIZE - ret, "%s%s", - p, action->name); - p =3D ","; + scoped_guard (raw_spinlock_irq, &desc->lock) { + for_each_action_of_desc(desc, action) { + ret +=3D scnprintf(buf + ret, PAGE_SIZE - ret, "%s%s", p, action->name); + p =3D ","; + } } - raw_spin_unlock_irq(&desc->lock); - - if (ret) - ret +=3D scnprintf(buf + ret, PAGE_SIZE - ret, "\n"); =20 - return ret; + return ret ? ret + scnprintf(buf + ret, PAGE_SIZE - ret, "\n") : 0; } IRQ_ATTR_RO(actions); =20 @@ -418,19 +382,14 @@ static int __init irq_sysfs_init(void) int irq; =20 /* Prevent concurrent irq alloc/free */ - irq_lock_sparse(); - + guard(mutex)(&sparse_irq_lock); irq_kobj_base =3D kobject_create_and_add("irq", kernel_kobj); - if (!irq_kobj_base) { - irq_unlock_sparse(); + if (!irq_kobj_base) return -ENOMEM; - } =20 /* Add the already allocated interrupts */ for_each_irq_desc(irq, desc) irq_sysfs_add(irq, desc); - irq_unlock_sparse(); - return 0; } postcore_initcall(irq_sysfs_init); @@ -573,12 +532,12 @@ static int alloc_descs(unsigned int star return -ENOMEM; } =20 -static int irq_expand_nr_irqs(unsigned int nr) +static bool irq_expand_nr_irqs(unsigned int nr) { if (nr > MAX_SPARSE_IRQS) - return -ENOMEM; + return false; nr_irqs =3D nr; - return 0; + return true; } =20 int __init early_irq_init(void) @@ -656,11 +615,9 @@ EXPORT_SYMBOL(irq_to_desc); static void free_desc(unsigned int irq) { struct irq_desc *desc =3D irq_to_desc(irq); - unsigned long flags; =20 - raw_spin_lock_irqsave(&desc->lock, flags); - desc_set_defaults(irq, desc, irq_desc_get_node(desc), NULL, NULL); - raw_spin_unlock_irqrestore(&desc->lock, flags); + scoped_guard (raw_spinlock_irqsave, &desc->lock) + desc_set_defaults(irq, desc, irq_desc_get_node(desc), NULL, NULL); delete_irq_desc(irq); } =20 @@ -681,14 +638,13 @@ static inline int alloc_descs(unsigned i =20 static int irq_expand_nr_irqs(unsigned int nr) { - return -ENOMEM; + return false; } =20 void irq_mark_irq(unsigned int irq) { - mutex_lock(&sparse_irq_lock); + guard(mutex)(&sparse_irq_lock); irq_insert_desc(irq, irq_desc + irq); - mutex_unlock(&sparse_irq_lock); } =20 #ifdef CONFIG_GENERIC_IRQ_LEGACY @@ -827,11 +783,9 @@ void irq_free_descs(unsigned int from, u if (from >=3D nr_irqs || (from + cnt) > nr_irqs) return; =20 - mutex_lock(&sparse_irq_lock); + guard(mutex)(&sparse_irq_lock); for (i =3D 0; i < cnt; i++) free_desc(from + i); - - mutex_unlock(&sparse_irq_lock); } EXPORT_SYMBOL_GPL(irq_free_descs); =20 @@ -848,11 +802,10 @@ EXPORT_SYMBOL_GPL(irq_free_descs); * * Returns the first irq number or error code */ -int __ref -__irq_alloc_descs(int irq, unsigned int from, unsigned int cnt, int node, - struct module *owner, const struct irq_affinity_desc *affinity) +int __ref __irq_alloc_descs(int irq, unsigned int from, unsigned int cnt, = int node, + struct module *owner, const struct irq_affinity_desc *affinity) { - int start, ret; + int start; =20 if (!cnt) return -EINVAL; @@ -870,22 +823,17 @@ int __ref from =3D arch_dynirq_lower_bound(from); } =20 - mutex_lock(&sparse_irq_lock); + guard(mutex)(&sparse_irq_lock); =20 start =3D irq_find_free_area(from, cnt); - ret =3D -EEXIST; if (irq >=3D0 && start !=3D irq) - goto unlock; + return -EEXIST; =20 if (start + cnt > nr_irqs) { - ret =3D irq_expand_nr_irqs(start + cnt); - if (ret) - goto unlock; + if (!irq_expand_nr_irqs(start + cnt)) + return -ENOMEM; } - ret =3D alloc_descs(start, cnt, node, affinity, owner); -unlock: - mutex_unlock(&sparse_irq_lock); - return ret; + return alloc_descs(start, cnt, node, affinity, owner); } EXPORT_SYMBOL_GPL(__irq_alloc_descs);