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| author | Ingo Molnar <mingo@elte.hu> | 2011-05-10 17:05:24 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2011-05-10 17:05:45 +0200 |
| commit | 932fed4e2e42c3d730c01bb63b1c4f812c533d5b (patch) | |
| tree | 11b1afac3a40d253cdb905c42901edfaae5e196e /kernel/workqueue.c | |
| parent | Merge branch 'perf/stat' into perf/core (diff) | |
| parent | Linux 2.6.39-rc7 (diff) | |
| download | linux-932fed4e2e42c3d730c01bb63b1c4f812c533d5b.tar.gz linux-932fed4e2e42c3d730c01bb63b1c4f812c533d5b.zip | |
Merge commit 'v2.6.39-rc7' into perf/core
Merge reason: pull in the latest fixes.
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel/workqueue.c')
| -rw-r--r-- | kernel/workqueue.c | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/kernel/workqueue.c b/kernel/workqueue.c index 8859a41806dd..e3378e8d3a5c 100644 --- a/kernel/workqueue.c +++ b/kernel/workqueue.c @@ -1291,8 +1291,14 @@ __acquires(&gcwq->lock) return true; spin_unlock_irq(&gcwq->lock); - /* CPU has come up in between, retry migration */ + /* + * We've raced with CPU hot[un]plug. Give it a breather + * and retry migration. cond_resched() is required here; + * otherwise, we might deadlock against cpu_stop trying to + * bring down the CPU on non-preemptive kernel. + */ cpu_relax(); + cond_resched(); } } |