freezer: remove racy clear_freeze_flag() and set PF_NOFREEZE on dead tasks

[cascardo/linux.git] / kernel / exit.c

diff --git a/kernel/exit.c b/kernel/exit.c
index d0b7d98..95a4141 100644 (file)
--- a/kernel/exit.c
+++ b/kernel/exit.c
@@ -679,8 +679,6 @@ static void exit_mm(struct task_struct * tsk)
        tsk->mm = NULL;
        up_read(&mm->mmap_sem);
        enter_lazy_tlb(mm, current);
-       /* We don't want this task to be frozen prematurely */
-       clear_freeze_flag(tsk);
        task_unlock(tsk);
        mm_update_next_owner(mm);
        mmput(mm);
@@ -1040,6 +1038,7 @@ NORET_TYPE void do_exit(long code)
        exit_rcu();
        /* causes final put_task_struct in finish_task_switch(). */
        tsk->state = TASK_DEAD;
+       tsk->flags |= PF_NOFREEZE;      /* tell freezer to ignore us */
        schedule();
        BUG();
        /* Avoid "noreturn function does return".  */