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cgroup: Fixes for v6.7-rc4

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Just one patch.
 
 f5d39b0208 ("freezer,sched: Rewrite core freezer logic") changed how
 freezing state is recorded which cgroup_freezing() disagree with the actual
 state of the task while thawing triggering a warning. Fix it by updating
 cgroup_freezing().
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Merge tag 'cgroup-for-6.7-rc4-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup

Pull cgroup fix from Tejun Heo:
 "Just one fix.

  Commit f5d39b0208 ("freezer,sched: Rewrite core freezer logic")
  changed how freezing state is recorded which made cgroup_freezing()
  disagree with the actual state of the task while thawing triggering a
  warning. Fix it by updating cgroup_freezing()"

* tag 'cgroup-for-6.7-rc4-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup:
  cgroup_freezer: cgroup_freezing: Check if not frozen
This commit is contained in:
Linus Torvalds 2023-12-07 12:42:40 -08:00
commit 9ace34a8e4
1 changed files with 7 additions and 1 deletions
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8
kernel/cgroup/legacy_freezer.c
View file

@ -66,9 +66,15 @@ static struct freezer *parent_freezer(struct freezer *freezer)
bool cgroup_freezing(struct task_struct *task)
{
bool ret;
unsigned int state;
rcu_read_lock();
ret = task_freezer(task)->state & CGROUP_FREEZING;
/* Check if the cgroup is still FREEZING, but not FROZEN. The extra
* !FROZEN check is required, because the FREEZING bit is not cleared
* when the state FROZEN is reached.
*/
state = task_freezer(task)->state;
ret = (state & CGROUP_FREEZING) && !(state & CGROUP_FROZEN);
rcu_read_unlock();
return ret;