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| author | Jiri Kosina <jkosina@suse.cz> | 2011-07-11 16:15:48 +0400 |
|---|---|---|
| committer | Jiri Kosina <jkosina@suse.cz> | 2011-07-11 16:15:55 +0400 |
| commit | b7e9c223be8ce335e30f2cf6ba588e6a4092275c (patch) | |
| tree | 2d1e3b75606abc18df7ad65e51ac3f90cd68b38d /kernel/exit.c | |
| parent | c172d82500a6cf3c32d1e650722a1055d72ce858 (diff) | |
| parent | e3bbfa78bab125f58b831b5f7f45b5a305091d72 (diff) | |
| download | linux-b7e9c223be8ce335e30f2cf6ba588e6a4092275c.tar.xz | |
Merge branch 'master' into for-next
Sync with Linus' tree to be able to apply pending patches that
are based on newer code already present upstream.
Diffstat (limited to 'kernel/exit.c')
| -rw-r--r-- | kernel/exit.c | 31 |
1 files changed, 15 insertions, 16 deletions
diff --git a/kernel/exit.c b/kernel/exit.c index 07dc154fc799..14c9b63a96c3 100644 --- a/kernel/exit.c +++ b/kernel/exit.c @@ -560,29 +560,28 @@ void exit_files(struct task_struct *tsk) #ifdef CONFIG_MM_OWNER /* - * Task p is exiting and it owned mm, lets find a new owner for it + * A task is exiting. If it owned this mm, find a new owner for the mm. */ -static inline int -mm_need_new_owner(struct mm_struct *mm, struct task_struct *p) -{ - /* - * If there are other users of the mm and the owner (us) is exiting - * we need to find a new owner to take on the responsibility. - */ - if (atomic_read(&mm->mm_users) <= 1) - return 0; - if (mm->owner != p) - return 0; - return 1; -} - void mm_update_next_owner(struct mm_struct *mm) { struct task_struct *c, *g, *p = current; retry: - if (!mm_need_new_owner(mm, p)) + /* + * If the exiting or execing task is not the owner, it's + * someone else's problem. + */ + if (mm->owner != p) return; + /* + * The current owner is exiting/execing and there are no other + * candidates. Do not leave the mm pointing to a possibly + * freed task structure. + */ + if (atomic_read(&mm->mm_users) <= 1) { + mm->owner = NULL; + return; + } read_lock(&tasklist_lock); /* |