diff options
| author | Simon Horman <horms@verge.net.au> | 2008-10-07 08:40:11 +1100 |
|---|---|---|
| committer | Simon Horman <horms@verge.net.au> | 2008-10-07 08:40:11 +1100 |
| commit | a5e8546a8bff5d2047adc279df5753c44ba7b1a1 (patch) | |
| tree | d9ca91f74d8279adbb1d3e942cc7ab145780ee29 /kernel/exit.c | |
| parent | cb7f6a7b716e801097b564dec3ccb58d330aef56 (diff) | |
| parent | c7004482e8dcb7c3c72666395cfa98a216a4fb70 (diff) | |
Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next-2.6 into lvs-next-2.6
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 16395644a98..85a83c83185 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: |