Hello, Linus.
Please consider pulling from the following branch to receive workqueue
fixes. It's later than I'd like but well the timing just didn't work
out this time.
git://git.kernel.org/pub/scm/linux/kernel/git/tj/wq.git for-3.6-fixes
There are three bug fixes. One from before 3.6-rc1 and two from the
new CPU hotplug code. Kudos to Lai for discovering all of them and
providing fixes.
* Atomicity bug when clearing a flag and setting another. The two
operation should have been atomic but wasn't. This bug has existed
for a long time but is unlikely to have actually happened. Fix is
safe. Marked for -stable.
* If CPU hotplug cycles happen back-to-back before workers finish the
previous cycle, the states could get out of sync and it could get
stuck. Fixed by waiting for workers to complete before finishing
hotplug cycle.
* While CPU hotplug is in progress, idle workers could be depleted
which can then lead to deadlock. I think both happening together is
highly unlikely but still better to fix it and the fix isn't too
scary.
Lai Jiangshan (3):
workqueue: UNBOUND -> REBIND morphing in rebind_workers() should be atomic
workqueue: restore POOL_MANAGING_WORKERS
workqueue: fix possible idle worker depletion across CPU hotplug
Tejun Heo (2):
workqueue: move WORKER_REBIND clearing in rebind_workers() to the end of
the function
workqueue: fix possible deadlock in idle worker rebinding
kernel/workqueue.c | 110 ++++++++++++++++++++++++++++++++++++++++++----------
1 files changed, 89 insertions(+), 21 deletions(-)
Thanks.
--
tejun
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