Hello, Linus.
* The code around workqueue scheduler hooks got reorganized early 2019 which
unfortuately introdued a couple subtle and rare race conditions where
preemption can mangle internal workqueue state triggering a WARN and
possibly causing a stall or at least delay in execution. Frederic fixed
both early December and the fixes were sitting in for-5.16-fixes which I
forgot to push. Merged into this pull request. I'll forward them to stable
after they land.
* The scheduler hook reorganization has more implicatoins for workqueue code
in that the hooks are now more strictly synchronized and thus the
interacting operations can become more straight-forward. Lai is in the
process of simplifying workqueue code and this pull request contains some
of the patches.
Thanks.
The following changes since commit c741e49150dbb0c0aebe234389f4aa8b47958fa8:
Merge tag 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rdma/rdma (2021-12-09 13:20:59 -0800)
are available in the Git repository at:
git://git.kernel.org/pub/scm/linux/kernel/git/tj/wq.git for-5.17
for you to fetch changes up to 2a8ab0fbd110dec25795a98aaa232ede36f6c855:
Merge branch 'workqueue/for-5.16-fixes' into workqueue/for-5.17 (2022-01-10 07:54:04 -1000)
----------------------------------------------------------------
Frederic Weisbecker (2):
workqueue: Fix unbind_workers() VS wq_worker_running() race
workqueue: Fix unbind_workers() VS wq_worker_sleeping() race
Lai Jiangshan (6):
workqueue: Remove the outdated comment before wq_worker_sleeping()
workqueue: Remove the advanced kicking of the idle workers in rebind_workers()
workqueue: Remove outdated comment about exceptional workers in unbind_workers()
workqueue: Remove schedule() in unbind_workers()
workqueue: Move the code of waking a worker up in unbind_workers()
workqueue: Remove the cacheline_aligned for nr_running
Paul E. McKenney (1):
workqueue: Upgrade queue_work_on() comment
Tejun Heo (1):
Merge branch 'workqueue/for-5.16-fixes' into workqueue/for-5.17
kernel/workqueue.c | 101 ++++++++++++++++++++++++-----------------------------
1 file changed, 45 insertions(+), 56 deletions(-)
--
tejun
The pull request you sent on Mon, 10 Jan 2022 08:51:54 -1000:
> git://git.kernel.org/pub/scm/linux/kernel/git/tj/wq.git for-5.17
has been merged into torvalds/linux.git:
https://git.kernel.org/torvalds/c/e9e64f85b416a276329134cd83ef8ad78b95a118
Thank you!
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