__wake_up_bit() checks waitqueue_active() and thus the caller needs
mb() as wake_up_bit() documents, fix task_clear_jobctl_trapping().
Signed-off-by: Oleg Nesterov <oleg@xxxxxxxxxx>
---
kernel/signal.c | 1 +
1 files changed, 1 insertions(+), 0 deletions(-)
diff --git a/kernel/signal.c b/kernel/signal.c
index c2a8542..f4c4119 100644
--- a/kernel/signal.c
+++ b/kernel/signal.c
@@ -277,6 +277,7 @@ void task_clear_jobctl_trapping(struct task_struct *task)
{
if (unlikely(task->jobctl & JOBCTL_TRAPPING)) {
task->jobctl &= ~JOBCTL_TRAPPING;
+ smp_mb(); /* advised by wake_up_bit() */
wake_up_bit(&task->jobctl, JOBCTL_TRAPPING_BIT);
}
}
--
1.5.5.1
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