Commit de620fb9 authored Nov 11, 2019 by Linus Torvalds

cgroup

Pull cgroup fix from Tejun Heo:
 "There's an inadvertent preemption point in ptrace_stop() which was
  reliably triggering for a test scenario significantly slowing it down.

  This contains Oleg's fix to remove the unwanted preemption point"

* 'for-5.4-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup:
  cgroup: freezer: call cgroup_enter_frozen() with preemption disabled in ptrace_stop()

parents 72d5ac67 937c6b27

kernel/signal.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -2205,8 +2205,8 @@ static void ptrace_stop(int exit_code, int why, int clear_code, kernel_siginfo_t
		*/
		preempt_disable();
		read_unlock(&tasklist_lock);
		preempt_enable_no_resched();
		cgroup_enter_frozen();
		preempt_enable_no_resched();
		freezable_schedule();
		cgroup_leave_frozen(true);
		} else {

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