From nobody Tue Nov 26 07:00:26 2024 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 EA63B1F8F01; Mon, 21 Oct 2024 15:13:09 +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=1729523591; cv=none; b=aMZRHCBm2enSJdpQuYspHXyZ3d9u5ITILp6lj5ZeW/JZD7lTwhUYdMaaZbFRlMGcCCe9Nl8BNKgrP2h3udQuVygvc45PMIg+Th2eBtwb0HAZECVMHyJLHtLJa3VMB0LlMARoCDkTfgd6wtcZhhabUATHRJohTLR+nFKfWj2/eck= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1729523591; c=relaxed/simple; bh=BmrD8P4kXmBSUNzxpOCTHa+WLE1X2hgSlmmP/4vpiCI=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=KiIzF9yz9Vt+Vkja9DLoryCR3WUzBlPGUj53+HgK+ohJvzsv7iFe6q0zneXzreC2chW+xS0qlsNtyZG8JDKPOP6xbQEXR2FN98JVOEJRqbj4muQFINnsSepEyADoXbK6TFloRou8NFN0dk8scYFhkztWtqMadBa0QaO5EyvcVok= 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=Qo4c5rWq; dkim=permerror (0-bit key) header.d=linutronix.de header.i=@linutronix.de header.b=m7Fec6Zk; 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="Qo4c5rWq"; dkim=permerror (0-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="m7Fec6Zk" From: Sebastian Andrzej Siewior DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1729523588; 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=MGvx53aEC/g+kE5bhkxfRgADXQtsPpYeRVLsbQC037o=; b=Qo4c5rWqFncDfIbbuRC+Rp8DCxZPp4zNxCLSeKpYH5oM7Ypt0+6Htig1f5MI5lZgbFRJ69 jmx9PJGF5aVLUBLPeO6nSlhGH/N8eq9JOiIOZiJAAKYbp5TPY7EBj7Chm9lhWNtVPLGqPp cEFb4HwUFwNP5nvTJG9ev3iENNOXv6Pi3VbL9snAz7BkRWY8Uhzc9f8MbsiRm+iD7Txeqx hGaejPBD5Mhz9UXovZLdy/EefnHYxc9gS9CvP5dUrpp7ktrFHS2LKhJ9xY/++TnyPXWTY7 B0TYwV9MIcdjbRW1vzG9+Lx/QMd21JM/eiUEmJyI5UkiGBOKULLgSzA3Nxf6/g== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1729523588; 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=MGvx53aEC/g+kE5bhkxfRgADXQtsPpYeRVLsbQC037o=; b=m7Fec6ZkmVQBTktBv5fQBVY1iDAxg54fWHlXfckdwPEpA24GJPlUy//0eBSeJDfODgj6uV uKtWzlapiB9DIICQ== To: linux-trace-kernel@vger.kernel.org, linux-kernel@vger.kernel.org Cc: Peter Zijlstra , tglx@linutronix.de, mingo@kernel.org, juri.lelli@redhat.com, vincent.guittot@linaro.org, dietmar.eggemann@arm.com, rostedt@goodmis.org, bsegall@google.com, mgorman@suse.de, vschneid@redhat.com, ankur.a.arora@oracle.com, efault@gmx.de, Masami Hiramatsu , Mathieu Desnoyers , Jisheng Zhang , Paul Walmsley , Palmer Dabbelt , Albert Ou , linux-riscv@lists.infradead.org, Palmer Dabbelt , Sebastian Andrzej Siewior Subject: [PATCH v2 3/3] riscv: add PREEMPT_LAZY support Date: Mon, 21 Oct 2024 17:08:42 +0200 Message-ID: <20241021151257.102296-4-bigeasy@linutronix.de> In-Reply-To: <20241021151257.102296-1-bigeasy@linutronix.de> References: <20241021151257.102296-1-bigeasy@linutronix.de> 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 Content-Type: text/plain; charset="utf-8" From: Jisheng Zhang riscv has switched to GENERIC_ENTRY, so adding PREEMPT_LAZY is as simple as adding TIF_NEED_RESCHED_LAZY related definitions and enabling ARCH_HAS_PREEMPT_LAZY. [bigeasy: Replace old PREEMPT_AUTO bits with new PREEMPT_LAZY ] Cc: Paul Walmsley Cc: Palmer Dabbelt Cc: Albert Ou Cc: linux-riscv@lists.infradead.org Acked-by: Palmer Dabbelt Signed-off-by: Jisheng Zhang Signed-off-by: Sebastian Andrzej Siewior --- arch/riscv/Kconfig | 1 + arch/riscv/include/asm/thread_info.h | 10 ++++++---- 2 files changed, 7 insertions(+), 4 deletions(-) --- a/arch/riscv/Kconfig +++ b/arch/riscv/Kconfig @@ -39,6 +39,7 @@ config RISCV select ARCH_HAS_MMIOWB select ARCH_HAS_NON_OVERLAPPING_ADDRESS_SPACE select ARCH_HAS_PMEM_API + select ARCH_HAS_PREEMPT_LAZY select ARCH_HAS_PREPARE_SYNC_CORE_CMD select ARCH_HAS_PTE_DEVMAP if 64BIT && MMU select ARCH_HAS_PTE_SPECIAL --- a/arch/riscv/include/asm/thread_info.h +++ b/arch/riscv/include/asm/thread_info.h @@ -107,9 +107,10 @@ int arch_dup_task_struct(struct task_str * - pending work-to-be-done flags are in lowest half-word * - other flags in upper half-word(s) */ -#define TIF_NOTIFY_RESUME 1 /* callback before returning to user */ -#define TIF_SIGPENDING 2 /* signal pending */ -#define TIF_NEED_RESCHED 3 /* rescheduling necessary */ +#define TIF_NEED_RESCHED 0 /* rescheduling necessary */ +#define TIF_NEED_RESCHED_LAZY 1 /* Lazy rescheduling needed */ +#define TIF_NOTIFY_RESUME 2 /* callback before returning to user */ +#define TIF_SIGPENDING 3 /* signal pending */ #define TIF_RESTORE_SIGMASK 4 /* restore signal mask in do_signal() */ #define TIF_MEMDIE 5 /* is terminating due to OOM killer */ #define TIF_NOTIFY_SIGNAL 9 /* signal notifications exist */ @@ -117,9 +118,10 @@ int arch_dup_task_struct(struct task_str #define TIF_32BIT 11 /* compat-mode 32bit process */ #define TIF_RISCV_V_DEFER_RESTORE 12 /* restore Vector before returing to = user */ =20 +#define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED) +#define _TIF_NEED_RESCHED_LAZY (1 << TIF_NEED_RESCHED_LAZY) #define _TIF_NOTIFY_RESUME (1 << TIF_NOTIFY_RESUME) #define _TIF_SIGPENDING (1 << TIF_SIGPENDING) -#define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED) #define _TIF_NOTIFY_SIGNAL (1 << TIF_NOTIFY_SIGNAL) #define _TIF_UPROBE (1 << TIF_UPROBE) #define _TIF_RISCV_V_DEFER_RESTORE (1 << TIF_RISCV_V_DEFER_RESTORE)