From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 4D3AF26B94D; Tue, 8 Apr 2025 12:42:12 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1744116132; cv=none; b=tdDo7x7py5lr5VH4goT3fgnzEM8rqQNDEjOOZJozZOPY4jg1PtNgiAGfL4L3bPmpeQY3b/typm2kSMNqg9uUlO8hYwWC7Eq9Pg+Idixo4WNMDciL5zp9X5YG9SMuuX2wYTi8pSx9yZ20MkynNZEfkVoIN503WqxrMLRqY1SJitg= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1744116132; c=relaxed/simple; bh=b+02XH1FHUzocuvhF8SeZdvFpfmaSr9AtqukqWNsqv8=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=VdOvFHNJEZluNQTRiB//RPFN8sMpMj49etrPTHKQa45N1Ysts1ssbJrrOEJMvIZEGN9q1bANNyIGSmyuAn6BfYXxGQiq6so6b3Zf9QqeUERZWlFmQ0JNWwzSWbc3iAxXczl1z0HpLcWyh68C4609tnr9CQbOMCdg8PMY/GEvMGo= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=ESpMfTt+; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="ESpMfTt+" Received: by smtp.kernel.org (Postfix) with ESMTPSA id D4602C4CEE7; Tue, 8 Apr 2025 12:42:11 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1744116132; bh=b+02XH1FHUzocuvhF8SeZdvFpfmaSr9AtqukqWNsqv8=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=ESpMfTt+C/lFS9HJPPGRU28P3yhS92nQb1/XKo/yFsFhoe/p01eScrlBM0l8ETwU9 1uqg7UBmsqPBetVNTqK++WYMWoYek8MkI9cJU5mlKTFDR+RNg60MCcnpGjC50WEeX4 fJzruUtQuJi38+XUs13tsBrTloHgz2zByH4ddFYc= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Guenter Roeck , "Steven Rostedt (Google)" , Sebastian Andrzej Siewior , "Peter Zijlstra (Intel)" , Sasha Levin Subject: [PATCH 6.12 027/423] lockdep: Dont disable interrupts on RT in disable_irq_nosync_lockdep.*() Date: Tue, 8 Apr 2025 12:45:53 +0200 Message-ID: <20250408104846.382179344@linuxfoundation.org> X-Mailer: git-send-email 2.49.0 In-Reply-To: <20250408104845.675475678@linuxfoundation.org> References: <20250408104845.675475678@linuxfoundation.org> User-Agent: quilt/0.68 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.12-stable review patch. If anyone has any objections, please let me know. ------------------ From: Sebastian Andrzej Siewior [ Upstream commit 87886b32d669abc11c7be95ef44099215e4f5788 ] disable_irq_nosync_lockdep() disables interrupts with lockdep enabled to avoid false positive reports by lockdep that a certain lock has not been acquired with disabled interrupts. The user of this macros expects that a lock can be acquried without disabling interrupts because the IRQ line triggering the interrupt is disabled. This triggers a warning on PREEMPT_RT because after disable_irq_nosync_lockdep.*() the following spinlock_t now is acquired with disabled interrupts. On PREEMPT_RT there is no difference between spin_lock() and spin_lock_irq() so avoiding disabling interrupts in this case works for the two remaining callers as of today. Don't disable interrupts on PREEMPT_RT in disable_irq_nosync_lockdep.*(). Closes: https://lore.kernel.org/760e34f9-6034-40e0-82a5-ee9becd24438@roeck-us.net Fixes: e8106b941ceab ("[PATCH] lockdep: core, add enable/disable_irq_irqsave/irqrestore() APIs") Reported-by: Guenter Roeck Suggested-by: "Steven Rostedt (Google)" Signed-off-by: Sebastian Andrzej Siewior Signed-off-by: Peter Zijlstra (Intel) Tested-by: Guenter Roeck Link: https://lore.kernel.org/r/20250212103619.2560503-2-bigeasy@linutronix.de Signed-off-by: Sasha Levin --- include/linux/interrupt.h | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/include/linux/interrupt.h b/include/linux/interrupt.h index 457151f9f263d..b378fbf885ce3 100644 --- a/include/linux/interrupt.h +++ b/include/linux/interrupt.h @@ -448,7 +448,7 @@ irq_calc_affinity_vectors(unsigned int minvec, unsigned int maxvec, static inline void disable_irq_nosync_lockdep(unsigned int irq) { disable_irq_nosync(irq); -#ifdef CONFIG_LOCKDEP +#if defined(CONFIG_LOCKDEP) && !defined(CONFIG_PREEMPT_RT) local_irq_disable(); #endif } @@ -456,7 +456,7 @@ static inline void disable_irq_nosync_lockdep(unsigned int irq) static inline void disable_irq_nosync_lockdep_irqsave(unsigned int irq, unsigned long *flags) { disable_irq_nosync(irq); -#ifdef CONFIG_LOCKDEP +#if defined(CONFIG_LOCKDEP) && !defined(CONFIG_PREEMPT_RT) local_irq_save(*flags); #endif } @@ -471,7 +471,7 @@ static inline void disable_irq_lockdep(unsigned int irq) static inline void enable_irq_lockdep(unsigned int irq) { -#ifdef CONFIG_LOCKDEP +#if defined(CONFIG_LOCKDEP) && !defined(CONFIG_PREEMPT_RT) local_irq_enable(); #endif enable_irq(irq); @@ -479,7 +479,7 @@ static inline void enable_irq_lockdep(unsigned int irq) static inline void enable_irq_lockdep_irqrestore(unsigned int irq, unsigned long *flags) { -#ifdef CONFIG_LOCKDEP +#if defined(CONFIG_LOCKDEP) && !defined(CONFIG_PREEMPT_RT) local_irq_restore(*flags); #endif enable_irq(irq); -- 2.39.5