[patch 16/19] rcu: Prevent false positive softirq warning on RT
From: Thomas Gleixner <hidden>
Date: 2020-11-13 14:24:41
Also in:
linux-sh, linux-um, lkml
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 <redacted> --- 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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