Commit ba9e6cab authored by Thomas Gleixner's avatar Thomas Gleixner
Browse files

rcu: Prevent false positive softirq warning on RT 



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: default avatarThomas Gleixner <tglx@linutronix.de>
Tested-by: default avatarSebastian Andrzej Siewior <bigeasy@linutronix.de>
Tested-by: default avatarPaul E. McKenney <paulmck@kernel.org>
Reviewed-by: default avatarPaul E. McKenney <paulmck@kernel.org>
Reviewed-by: default avatarFrederic Weisbecker <frederic@kernel.org>
Acked-by: default avatarPeter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lore.kernel.org/r/20210309085727.626304079@linutronix.de
parent 47c218dc

include/linux/rcupdate.h

+2 −1
Original line number Diff line number Diff line
@@ -334,6 +334,7 @@ static inline void rcu_preempt_sleep_check(void) { } 
#define rcu_sleep_check()						\

	do {								\

		rcu_preempt_sleep_check();				\

		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),	\