On Fri, Dec 04, 2020 at 06:01:57PM +0100, Thomas Gleixner wrote:
> From: Thomas Gleixner <t...@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 <t...@linutronix.de>
Reviewed-by: Paul E. McKenney <paul...@kernel.org>
> ---
> 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"); \
>
