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| author | Ingo Molnar <mingo@elte.hu> | 2008-10-06 06:13:18 (GMT) |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2008-10-06 06:13:18 (GMT) |
| commit | 2c10c22af088ab5d94fae93ce3fe6436b2a208b4 (patch) | |
| tree | db27721001f194327ddbdcd6c983c4ec68b77c00 /kernel/exit.c | |
| parent | f6121f4f8708195e88cbdf8dd8d171b226b3f858 (diff) | |
| parent | fec6ed1d1f9b78a6acb4a3eb2c46c812ac2e96f0 (diff) | |
| download | linux-fsl-qoriq-2c10c22af088ab5d94fae93ce3fe6436b2a208b4.tar.xz | |
Merge branch 'linus' into sched/devel
Diffstat (limited to 'kernel/exit.c')
| -rw-r--r-- | kernel/exit.c | 12 |
1 files changed, 10 insertions, 2 deletions
diff --git a/kernel/exit.c b/kernel/exit.c index 1639564..85a83c8 100644 --- a/kernel/exit.c +++ b/kernel/exit.c @@ -583,8 +583,6 @@ 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 (!mm) - return 0; if (atomic_read(&mm->mm_users) <= 1) return 0; if (mm->owner != p) @@ -627,6 +625,16 @@ retry: } while_each_thread(g, c); read_unlock(&tasklist_lock); + /* + * We found no owner yet mm_users > 1: this implies that we are + * most likely racing with swapoff (try_to_unuse()) or /proc or + * ptrace or page migration (get_task_mm()). Mark owner as NULL, + * so that subsystems can understand the callback and take action. + */ + down_write(&mm->mmap_sem); + cgroup_mm_owner_callbacks(mm->owner, NULL); + mm->owner = NULL; + up_write(&mm->mmap_sem); return; assign_new_owner: |