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29 lines
1.2 KiB
Diff
29 lines
1.2 KiB
Diff
From: Thomas Gleixner <tglx@linutronix.de>
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Date: Tue, 9 Mar 2021 09:55:58 +0100
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Subject: [PATCH 20/20] rcu: Prevent false positive softirq warning on RT
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Soft interrupt disabled sections can legitimately be preempted or schedule
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out when blocking on a lock on RT enabled kernels so the RCU preempt check
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warning has to be disabled for RT kernels.
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Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
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Tested-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
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Reviewed-by: Paul E. McKenney <paulmck@kernel.org>
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Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
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---
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include/linux/rcupdate.h | 3 ++-
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1 file changed, 2 insertions(+), 1 deletion(-)
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--- a/include/linux/rcupdate.h
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+++ b/include/linux/rcupdate.h
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@@ -328,7 +328,8 @@ static inline void rcu_preempt_sleep_che
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#define rcu_sleep_check() \
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do { \
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rcu_preempt_sleep_check(); \
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- RCU_LOCKDEP_WARN(lock_is_held(&rcu_bh_lock_map), \
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+ if (!IS_ENABLED(CONFIG_PREEMPT_RT)) \
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+ RCU_LOCKDEP_WARN(lock_is_held(&rcu_bh_lock_map), \
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"Illegal context switch in RCU-bh read-side critical section"); \
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RCU_LOCKDEP_WARN(lock_is_held(&rcu_sched_lock_map), \
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"Illegal context switch in RCU-sched read-side critical section"); \
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