From: Thomas Gleixner <tglx@linutronix.de>
To: LKML <linux-kernel@vger.kernel.org>
Cc: Marc Zyngier <maz@kernel.org>, Rich Felker <dalias@libc.org>,
Catalin Marinas <catalin.marinas@arm.com>,
Paul McKenney <paulmck@kernel.org>, Arnd Bergmann <arnd@arndb.de>,
linux-sh@vger.kernel.org, Peter Zijlstra <peterz@infradead.org>,
Richard Weinberger <richard@nod.at>,
Frederic Weisbecker <frederic@kernel.org>,
Valentin Schneider <valentin.schneider@arm.com>,
Jeff Dike <jdike@addtoit.com>,
Russell King <linux@armlinux.org.uk>,
Yoshinori Sato <ysato@users.sourceforge.jp>,
"James E.J. Bottomley" <James.Bottomley@HansenPartnership.com>,
linux-parisc@vger.kernel.org, Helge Deller <deller@gmx.de>,
linux-um@lists.infradead.org, Will Deacon <will@kernel.org>,
Sebastian Andrzej Siewior <bigeasy@linutronix.de>,
linux-arm-kernel@lists.infradead.org,
Anton Ivanov <anton.ivanov@cambridgegreys.com>
Subject: [patch 16/19] rcu: Prevent false positive softirq warning on RT
Date: Fri, 13 Nov 2020 14:02:23 +0000 [thread overview]
Message-ID: <20201113141734.558782917@linutronix.de> (raw)
In-Reply-To: 20201113140207.499353218@linutronix.de
Soft interrupt disabled sections can legitimately be preempted or schedule
out when blocking on a lock on RT enabled kernels so the RCU preempt check
warning has to be disabled for RT kernels.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
---
include/linux/rcupdate.h | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
--- a/include/linux/rcupdate.h
+++ b/include/linux/rcupdate.h
@@ -319,7 +319,8 @@ static inline void rcu_preempt_sleep_che
#define rcu_sleep_check() \
do { \
rcu_preempt_sleep_check(); \
- RCU_LOCKDEP_WARN(lock_is_held(&rcu_bh_lock_map), \
+ if (!IS_ENABLED(CONFIG_PREEMPT_RT)) \
+ RCU_LOCKDEP_WARN(lock_is_held(&rcu_bh_lock_map), \
"Illegal context switch in RCU-bh read-side critical section"); \
RCU_LOCKDEP_WARN(lock_is_held(&rcu_sched_lock_map), \
"Illegal context switch in RCU-sched read-side critical section"); \
WARNING: multiple messages have this Message-ID (diff)
From: Thomas Gleixner <tglx@linutronix.de>
To: LKML <linux-kernel@vger.kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>,
Frederic Weisbecker <frederic@kernel.org>,
Paul McKenney <paulmck@kernel.org>,
Sebastian Andrzej Siewior <bigeasy@linutronix.de>,
Arnd Bergmann <arnd@arndb.de>,
"James E.J. Bottomley" <James.Bottomley@HansenPartnership.com>,
Helge Deller <deller@gmx.de>,
linux-parisc@vger.kernel.org,
Yoshinori Sato <ysato@users.sourceforge.jp>,
Rich Felker <dalias@libc.org>,
linux-sh@vger.kernel.org, Jeff Dike <jdike@addtoit.com>,
Richard Weinberger <richard@nod.at>,
Anton Ivanov <anton.ivanov@cambridgegreys.com>,
linux-um@lists.infradead.org,
Russell King <linux@armlinux.org.uk>,
Marc Zyngier <maz@kernel.org>,
Valentin Schneider <valentin.schneider@arm.com>,
linux-arm-kernel@lists.infradead.org,
Catalin Marinas <catalin.marinas@arm.com>,
Will Deacon <will@kernel.org>
Subject: [patch 16/19] rcu: Prevent false positive softirq warning on RT
Date: Fri, 13 Nov 2020 15:02:23 +0100 [thread overview]
Message-ID: <20201113141734.558782917@linutronix.de> (raw)
In-Reply-To: 20201113140207.499353218@linutronix.de
Soft interrupt disabled sections can legitimately be preempted or schedule
out when blocking on a lock on RT enabled kernels so the RCU preempt check
warning has to be disabled for RT kernels.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
---
include/linux/rcupdate.h | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
--- a/include/linux/rcupdate.h
+++ b/include/linux/rcupdate.h
@@ -319,7 +319,8 @@ static inline void rcu_preempt_sleep_che
#define rcu_sleep_check() \
do { \
rcu_preempt_sleep_check(); \
- RCU_LOCKDEP_WARN(lock_is_held(&rcu_bh_lock_map), \
+ if (!IS_ENABLED(CONFIG_PREEMPT_RT)) \
+ RCU_LOCKDEP_WARN(lock_is_held(&rcu_bh_lock_map), \
"Illegal context switch in RCU-bh read-side critical section"); \
RCU_LOCKDEP_WARN(lock_is_held(&rcu_sched_lock_map), \
"Illegal context switch in RCU-sched read-side critical section"); \
WARNING: multiple messages have this Message-ID (diff)
From: Thomas Gleixner <tglx@linutronix.de>
To: LKML <linux-kernel@vger.kernel.org>
Cc: Marc Zyngier <maz@kernel.org>, Rich Felker <dalias@libc.org>,
Catalin Marinas <catalin.marinas@arm.com>,
Paul McKenney <paulmck@kernel.org>, Arnd Bergmann <arnd@arndb.de>,
linux-sh@vger.kernel.org, Peter Zijlstra <peterz@infradead.org>,
Richard Weinberger <richard@nod.at>,
Frederic Weisbecker <frederic@kernel.org>,
Valentin Schneider <valentin.schneider@arm.com>,
Jeff Dike <jdike@addtoit.com>,
Russell King <linux@armlinux.org.uk>,
Yoshinori Sato <ysato@users.sourceforge.jp>,
"James E.J. Bottomley" <James.Bottomley@HansenPartnership.com>,
linux-parisc@vger.kernel.org, Helge Deller <deller@gmx.de>,
linux-um@lists.infradead.org, Will Deacon <will@kernel.org>,
Sebastian Andrzej Siewior <bigeasy@linutronix.de>,
linux-arm-kernel@lists.infradead.org,
Anton Ivanov <anton.ivanov@cambridgegreys.com>
Subject: [patch 16/19] rcu: Prevent false positive softirq warning on RT
Date: Fri, 13 Nov 2020 15:02:23 +0100 [thread overview]
Message-ID: <20201113141734.558782917@linutronix.de> (raw)
In-Reply-To: 20201113140207.499353218@linutronix.de
Soft interrupt disabled sections can legitimately be preempted or schedule
out when blocking on a lock on RT enabled kernels so the RCU preempt check
warning has to be disabled for RT kernels.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
---
include/linux/rcupdate.h | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
--- a/include/linux/rcupdate.h
+++ b/include/linux/rcupdate.h
@@ -319,7 +319,8 @@ static inline void rcu_preempt_sleep_che
#define rcu_sleep_check() \
do { \
rcu_preempt_sleep_check(); \
- RCU_LOCKDEP_WARN(lock_is_held(&rcu_bh_lock_map), \
+ if (!IS_ENABLED(CONFIG_PREEMPT_RT)) \
+ RCU_LOCKDEP_WARN(lock_is_held(&rcu_bh_lock_map), \
"Illegal context switch in RCU-bh read-side critical section"); \
RCU_LOCKDEP_WARN(lock_is_held(&rcu_sched_lock_map), \
"Illegal context switch in RCU-sched read-side critical section"); \
_______________________________________________
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next prev parent reply other threads:[~2020-11-13 14:02 UTC|newest]
Thread overview: 136+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-11-13 14:02 [patch 00/19] softirq: Cleanups and RT awareness Thomas Gleixner
2020-11-13 14:02 ` Thomas Gleixner
2020-11-13 14:02 ` Thomas Gleixner
2020-11-13 14:02 ` [patch 01/19] parisc: Remove bogus __IRQ_STAT macro Thomas Gleixner
2020-11-13 14:02 ` Thomas Gleixner
2020-11-13 14:02 ` Thomas Gleixner
2020-11-23 22:51 ` [tip: irq/core] " tip-bot2 for Thomas Gleixner
2020-11-13 14:02 ` [patch 02/19] sh: Get rid of nmi_count() Thomas Gleixner
2020-11-13 14:02 ` Thomas Gleixner
2020-11-13 14:02 ` Thomas Gleixner
2020-11-13 14:02 ` Thomas Gleixner
2020-11-23 22:51 ` [tip: irq/core] " tip-bot2 for Thomas Gleixner
2021-01-01 14:27 ` [patch 02/19] " John Paul Adrian Glaubitz
2021-01-01 14:27 ` John Paul Adrian Glaubitz
2021-01-01 14:27 ` John Paul Adrian Glaubitz
2020-11-13 14:02 ` [patch 03/19] irqstat: Get rid of nmi_count() and __IRQ_STAT() Thomas Gleixner
2020-11-13 14:02 ` Thomas Gleixner
2020-11-13 14:02 ` Thomas Gleixner
2020-11-13 14:02 ` Thomas Gleixner
2020-11-23 22:51 ` [tip: irq/core] " tip-bot2 for Thomas Gleixner
2020-11-13 14:02 ` [patch 04/19] um/irqstat: Get rid of the duplicated declarations Thomas Gleixner
2020-11-13 14:02 ` Thomas Gleixner
2020-11-13 14:02 ` Thomas Gleixner
2020-11-13 14:02 ` Thomas Gleixner
2020-11-23 22:51 ` [tip: irq/core] " tip-bot2 for Thomas Gleixner
2020-11-13 14:02 ` [patch 05/19] ARM: irqstat: Get rid of duplicated declaration Thomas Gleixner
2020-11-13 14:02 ` Thomas Gleixner
2020-11-13 14:02 ` Thomas Gleixner
2020-11-13 14:02 ` Thomas Gleixner
2020-11-16 18:19 ` Valentin Schneider
2020-11-16 18:19 ` Valentin Schneider
2020-11-16 18:19 ` Valentin Schneider
2020-11-23 22:51 ` [tip: irq/core] " tip-bot2 for Thomas Gleixner
2020-11-13 14:02 ` [patch 06/19] arm64: " Thomas Gleixner
2020-11-13 14:02 ` Thomas Gleixner
2020-11-13 14:02 ` Thomas Gleixner
2020-11-13 14:02 ` Thomas Gleixner
2020-11-16 10:01 ` Will Deacon
2020-11-16 10:01 ` Will Deacon
2020-11-16 10:01 ` Will Deacon
2020-11-16 10:01 ` Will Deacon
2020-11-16 10:51 ` Marc Zyngier
2020-11-16 10:51 ` Marc Zyngier
2020-11-16 10:51 ` Marc Zyngier
2020-11-23 22:51 ` [tip: irq/core] " tip-bot2 for Thomas Gleixner
2020-11-13 14:02 ` [patch 07/19] asm-generic/irqstat: Add optional __nmi_count member Thomas Gleixner
2020-11-13 14:02 ` Thomas Gleixner
2020-11-13 14:02 ` Thomas Gleixner
2020-11-23 22:51 ` [tip: irq/core] " tip-bot2 for Thomas Gleixner
2020-11-13 14:02 ` [patch 08/19] sh: irqstat: Use the generic irq_cpustat_t Thomas Gleixner
2020-11-13 14:02 ` Thomas Gleixner
2020-11-13 14:02 ` Thomas Gleixner
2020-11-13 14:02 ` Thomas Gleixner
2020-11-23 22:51 ` [tip: irq/core] " tip-bot2 for Thomas Gleixner
2020-11-13 14:02 ` [patch 09/19] irqstat: Move declaration into asm-generic/hardirq.h Thomas Gleixner
2020-11-13 14:02 ` Thomas Gleixner
2020-11-13 14:02 ` Thomas Gleixner
2020-11-23 22:51 ` [tip: irq/core] " tip-bot2 for Thomas Gleixner
2020-11-13 14:02 ` [patch 10/19] preempt: Cleanup the macro maze a bit Thomas Gleixner
2020-11-13 14:02 ` Thomas Gleixner
2020-11-13 14:02 ` Thomas Gleixner
2020-11-16 12:17 ` Peter Zijlstra
2020-11-16 12:17 ` Peter Zijlstra
2020-11-16 12:17 ` Peter Zijlstra
2020-11-16 12:17 ` Peter Zijlstra
2020-11-16 17:42 ` Thomas Gleixner
2020-11-16 17:42 ` Thomas Gleixner
2020-11-16 17:42 ` Thomas Gleixner
2020-11-17 10:21 ` Peter Zijlstra
2020-11-17 10:21 ` Peter Zijlstra
2020-11-17 10:21 ` Peter Zijlstra
2020-11-23 22:51 ` [tip: irq/core] " tip-bot2 for Thomas Gleixner
2020-11-13 14:02 ` [patch 11/19] softirq: Move related code into one section Thomas Gleixner
2020-11-13 14:02 ` Thomas Gleixner
2020-11-13 14:02 ` Thomas Gleixner
2020-11-19 12:20 ` Frederic Weisbecker
2020-11-19 12:20 ` Frederic Weisbecker
2020-11-23 22:51 ` [tip: irq/core] " tip-bot2 for Thomas Gleixner
2020-11-13 14:02 ` [patch 12/19] softirq: Add RT specific softirq accounting Thomas Gleixner
2020-11-13 14:02 ` Thomas Gleixner
2020-11-13 14:02 ` Thomas Gleixner
2020-11-19 12:18 ` Frederic Weisbecker
2020-11-19 12:18 ` Frederic Weisbecker
2020-11-19 12:18 ` Frederic Weisbecker
2020-11-19 18:34 ` Thomas Gleixner
2020-11-19 18:34 ` Thomas Gleixner
2020-11-19 18:34 ` Thomas Gleixner
2020-11-19 22:52 ` Frederic Weisbecker
2020-11-19 22:52 ` Frederic Weisbecker
2020-11-13 14:02 ` [patch 13/19] softirq: Move various protections into inline helpers Thomas Gleixner
2020-11-13 14:02 ` Thomas Gleixner
2020-11-13 14:02 ` Thomas Gleixner
2020-11-13 14:02 ` [patch 14/19] softirq: Make softirq control and processing RT aware Thomas Gleixner
2020-11-13 14:02 ` Thomas Gleixner
2020-11-13 14:02 ` Thomas Gleixner
2020-11-20 0:26 ` Frederic Weisbecker
2020-11-20 0:26 ` Frederic Weisbecker
2020-11-20 0:26 ` Frederic Weisbecker
2020-11-20 13:27 ` Thomas Gleixner
2020-11-20 13:27 ` Thomas Gleixner
2020-11-20 13:27 ` Thomas Gleixner
2020-11-23 13:44 ` Frederic Weisbecker
2020-11-23 13:44 ` Frederic Weisbecker
2020-11-23 13:44 ` Frederic Weisbecker
2020-11-23 19:27 ` Thomas Gleixner
2020-11-23 19:27 ` Thomas Gleixner
2020-11-23 19:56 ` Frederic Weisbecker
2020-11-23 19:56 ` Frederic Weisbecker
2020-11-23 19:56 ` Frederic Weisbecker
2020-11-23 23:58 ` Frederic Weisbecker
2020-11-23 23:58 ` Frederic Weisbecker
2020-11-23 23:58 ` Frederic Weisbecker
2020-11-24 0:06 ` Thomas Gleixner
2020-11-24 0:06 ` Thomas Gleixner
2020-11-24 0:06 ` Thomas Gleixner
2020-11-24 0:13 ` Frederic Weisbecker
2020-11-24 0:13 ` Frederic Weisbecker
2020-11-24 0:13 ` Frederic Weisbecker
2020-11-24 0:22 ` Thomas Gleixner
2020-11-24 0:22 ` Thomas Gleixner
2020-11-24 0:22 ` Thomas Gleixner
2020-11-13 14:02 ` [patch 15/19] tick/sched: Prevent false positive softirq pending warnings on RT Thomas Gleixner
2020-11-13 14:02 ` Thomas Gleixner
2020-11-13 14:02 ` Thomas Gleixner
2020-11-13 14:02 ` Thomas Gleixner [this message]
2020-11-13 14:02 ` [patch 16/19] rcu: Prevent false positive softirq warning " Thomas Gleixner
2020-11-13 14:02 ` Thomas Gleixner
2020-11-13 14:02 ` [patch 17/19] softirq: Replace barrier() with cpu_relax() in tasklet_unlock_wait() Thomas Gleixner
2020-11-13 14:02 ` Thomas Gleixner
2020-11-13 14:02 ` Thomas Gleixner
2020-11-13 14:02 ` [patch 18/19] tasklets: Use static inlines for stub implementations Thomas Gleixner
2020-11-13 14:02 ` Thomas Gleixner
2020-11-13 14:02 ` Thomas Gleixner
2020-11-13 14:02 ` [patch 19/19] tasklets: Prevent kill/unlock_wait deadlock on RT Thomas Gleixner
2020-11-13 14:02 ` Thomas Gleixner
2020-11-13 14:02 ` Thomas Gleixner
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