diff options
Diffstat (limited to 'features/rt/rcu-Prevent-false-positive-softirq-warning-on-RT.patch')
| -rw-r--r-- | features/rt/rcu-Prevent-false-positive-softirq-warning-on-RT.patch | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/features/rt/rcu-Prevent-false-positive-softirq-warning-on-RT.patch b/features/rt/rcu-Prevent-false-positive-softirq-warning-on-RT.patch new file mode 100644 index 00000000..5efbe3e1 --- /dev/null +++ b/features/rt/rcu-Prevent-false-positive-softirq-warning-on-RT.patch @@ -0,0 +1,34 @@ +From 6d20c55d64b7184c04dacaf5fb0b46d3ae3f9554 Mon Sep 17 00:00:00 2001 +From: Thomas Gleixner <tglx@linutronix.de> +Date: Tue, 9 Mar 2021 09:55:58 +0100 +Subject: [PATCH 060/191] 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: Thomas Gleixner <tglx@linutronix.de> +Tested-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> +Reviewed-by: Paul E. McKenney <paulmck@kernel.org> +Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> +--- + include/linux/rcupdate.h | 3 ++- + 1 file changed, 2 insertions(+), 1 deletion(-) + +diff --git a/include/linux/rcupdate.h b/include/linux/rcupdate.h +index bd04f722714f..6d855ef091ba 100644 +--- a/include/linux/rcupdate.h ++++ b/include/linux/rcupdate.h +@@ -334,7 +334,8 @@ static inline void rcu_preempt_sleep_check(void) { } + #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"); \ +-- +2.19.1 + |