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workqueue: Fixes for v6.8-rc4

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Just one patch to revert ca10d851b9 ("workqueue: Override implicit ordered
 attribute in workqueue_apply_unbound_cpumask()"). This could break ordering
 guarantee for ordered workqueues. The problem that the commit tried to
 resolve partially - making ordered workqueues follow unbound cpumask - is
 fully solved in wq/for-6.9 branch.
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Merge tag 'wq-for-6.8-rc4-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/wq

Pull workqueue fix from Tejun Heo:
 "Just one patch to revert commit ca10d851b9 ("workqueue: Override
  implicit ordered attribute in workqueue_apply_unbound_cpumask()").

  This commit could break ordering guarantees for ordered workqueues.
  The problem that the commit tried to resolve partially - making
  ordered workqueues follow unbound cpumask - is fully solved in
  wq/for-6.9 branch"

* tag 'wq-for-6.8-rc4-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/wq:
  Revert "workqueue: Override implicit ordered attribute in workqueue_apply_unbound_cpumask()"
This commit is contained in:
Linus Torvalds 2024-02-16 14:00:19 -08:00
commit 975b26ab30
1 changed files with 2 additions and 6 deletions
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8
kernel/workqueue.c
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@ -5786,13 +5786,9 @@ static int workqueue_apply_unbound_cpumask(const cpumask_var_t unbound_cpumask)
list_for_each_entry(wq, &workqueues, list) {
if (!(wq->flags & WQ_UNBOUND))
continue;
/* creating multiple pwqs breaks ordering guarantee */
if (!list_empty(&wq->pwqs)) {
if (wq->flags & __WQ_ORDERED_EXPLICIT)
continue;
wq->flags &= ~__WQ_ORDERED;
}
if (wq->flags & __WQ_ORDERED)
continue;
ctx = apply_wqattrs_prepare(wq, wq->unbound_attrs, unbound_cpumask);
if (IS_ERR(ctx)) {