diff options
| author | Peter Zijlstra <[email protected]> | 2019-07-10 12:57:36 +0200 |
|---|---|---|
| committer | Ingo Molnar <[email protected]> | 2019-07-13 11:23:27 +0200 |
| commit | e3d85487fba42206024bc3ed32e4b581c7cb46db (patch) | |
| tree | 097026f897c34b25939b812c836bf60ff49e79df | |
| parent | f632a8170a6b667ee4e3f552087588f0fe13c4bb (diff) | |
sched/core: Fix preempt warning in ttwu
John reported a DEBUG_PREEMPT warning caused by commit:
aacedf26fb76 ("sched/core: Optimize try_to_wake_up() for local wakeups")
I overlooked that ttwu_stat() requires preemption disabled.
Reported-by: John Stultz <[email protected]>
Tested-by: John Stultz <[email protected]>
Signed-off-by: Peter Zijlstra (Intel) <[email protected]>
Cc: Andrew Morton <[email protected]>
Cc: Linus Torvalds <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Fixes: aacedf26fb76 ("sched/core: Optimize try_to_wake_up() for local wakeups")
Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: Ingo Molnar <[email protected]>
| -rw-r--r-- | kernel/sched/core.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/kernel/sched/core.c b/kernel/sched/core.c index fa43ce3962e7..2b037f195473 100644 --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -2399,6 +2399,7 @@ try_to_wake_up(struct task_struct *p, unsigned int state, int wake_flags) unsigned long flags; int cpu, success = 0; + preempt_disable(); if (p == current) { /* * We're waking current, this means 'p->on_rq' and 'task_cpu(p) @@ -2412,7 +2413,7 @@ try_to_wake_up(struct task_struct *p, unsigned int state, int wake_flags) * it disabling IRQs (this allows not taking ->pi_lock). */ if (!(p->state & state)) - return false; + goto out; success = 1; cpu = task_cpu(p); @@ -2526,6 +2527,7 @@ unlock: out: if (success) ttwu_stat(p, cpu, wake_flags); + preempt_enable(); return success; } |