From mboxrd@z Thu Jan 1 00:00:00 1970 From: Thomas Gleixner Date: Fri, 13 Nov 2020 14:02:23 +0000 Subject: [patch 16/19] rcu: Prevent false positive softirq warning on RT Message-Id: <20201113141734.558782917@linutronix.de> List-Id: References: <20201113140207.499353218@linutronix.de> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: LKML Cc: Marc Zyngier , Rich Felker , Catalin Marinas , Paul McKenney , Arnd Bergmann , linux-sh@vger.kernel.org, Peter Zijlstra , Richard Weinberger , Frederic Weisbecker , Valentin Schneider , Jeff Dike , Russell King , Yoshinori Sato , "James E.J. Bottomley" , linux-parisc@vger.kernel.org, Helge Deller , linux-um@lists.infradead.org, Will Deacon , Sebastian Andrzej Siewior , linux-arm-kernel@lists.infradead.org, Anton Ivanov 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 --- 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"); \