diff options
| author | Thomas Gleixner <tglx@linutronix.de> | 2021-03-09 09:55:57 +0100 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2021-03-17 16:34:11 +0100 |
| commit | 47c218dcae6587fb5bce30f1656b13e22391c8e3 (patch) | |
| tree | 0577017548da523ecaf141594aefd66291d036e7 /include/linux | |
| parent | 8b1c04acad082dec76f3f8f7e1fa13493d6cbb79 (diff) | |
tick/sched: Prevent false positive softirq pending warnings on RT
On RT a task which has soft interrupts disabled can block on a lock and
schedule out to idle while soft interrupts are pending. This triggers the
warning in the NOHZ idle code which complains about going idle with pending
soft interrupts. But as the task is blocked soft interrupt processing is
temporarily blocked as well which means that such a warning is a false
positive.
To prevent that check the per CPU state which indicates that a scheduled
out task has soft interrupts disabled.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Tested-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Tested-by: Paul E. McKenney <paulmck@kernel.org>
Reviewed-by: Frederic Weisbecker <frederic@kernel.org>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lore.kernel.org/r/20210309085727.527563866@linutronix.de
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/bottom_half.h | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/include/linux/bottom_half.h b/include/linux/bottom_half.h index e4dd613a070e..eed86eb0a1de 100644 --- a/include/linux/bottom_half.h +++ b/include/linux/bottom_half.h @@ -32,4 +32,10 @@ static inline void local_bh_enable(void) __local_bh_enable_ip(_THIS_IP_, SOFTIRQ_DISABLE_OFFSET); } +#ifdef CONFIG_PREEMPT_RT +extern bool local_bh_blocked(void); +#else +static inline bool local_bh_blocked(void) { return false; } +#endif + #endif /* _LINUX_BH_H */ |