diff mbox series

[16/19] rcu: Prevent false positive softirq warning on RT

Message ID 20201113141734.558782917@linutronix.de (mailing list archive)
State Not Applicable
Headers show
Series softirq: Cleanups and RT awareness | expand

Commit Message

Thomas Gleixner Nov. 13, 2020, 2:02 p.m. UTC 
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(-)
diff mbox series

Patch

--- 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"); \