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| author | Peter Zijlstra <[email protected]> | 2011-05-26 12:21:33 +0000 |
|---|---|---|
| committer | Ingo Molnar <[email protected]> | 2011-05-28 15:02:55 +0000 |
| commit | d6aa8f85f16379d42c147b22b59e33b67f9ff466 (patch) | |
| tree | 7e28fec1b4d23f5a60fb3370dd446b36aff66379 /fs/jbd2/commit.c | |
| parent | sched: More sched_domain iterations fixes (diff) | |
| download | kernel-d6aa8f85f16379d42c147b22b59e33b67f9ff466.tar.gz kernel-d6aa8f85f16379d42c147b22b59e33b67f9ff466.zip | |
sched: Fix ttwu() for __ARCH_WANT_INTERRUPTS_ON_CTXSW
Marc reported that e4a52bcb9 (sched: Remove rq->lock from the first
half of ttwu()) broke his ARM-SMP machine. Now ARM is one of the few
__ARCH_WANT_INTERRUPTS_ON_CTXSW users, so that exception in the ttwu()
code was suspect.
Yong found that the interrupt could hit after context_switch() changes
current but before it clears p->on_cpu, if that interrupt were to
attempt a wake-up of p we would indeed find ourselves spinning in IRQ
context.
Fix this by reverting to the old behaviour for this situation and
perform a full remote wake-up.
Cc: Frank Rowand <[email protected]>
Cc: Yong Zhang <[email protected]>
Cc: Oleg Nesterov <[email protected]>
Reported-by: Marc Zyngier <[email protected]>
Tested-by: Marc Zyngier <[email protected]>
Signed-off-by: Peter Zijlstra <[email protected]>
Signed-off-by: Ingo Molnar <[email protected]>
Diffstat (limited to 'fs/jbd2/commit.c')
0 files changed, 0 insertions, 0 deletions