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| author | Tejun Heo <tj@kernel.org> | 2012-10-19 02:40:30 +0200 |
|---|---|---|
| committer | Tejun Heo <tj@kernel.org> | 2012-10-19 23:09:35 +0200 |
| commit | d87838321124061f6c935069d97f37010fa417e6 (patch) | |
| tree | 825e291d0ad7bdc7e7eb68e4bb829121de2586bc /kernel/utsname_sysctl.c | |
| parent | Revert "cgroup: Drop task_lock(parent) on cgroup_fork()" (diff) | |
| download | linux-d87838321124061f6c935069d97f37010fa417e6.tar.xz linux-d87838321124061f6c935069d97f37010fa417e6.zip | |
Revert "cgroup: Remove task_lock() from cgroup_post_fork()"
This reverts commit 7e3aa30ac8c904a706518b725c451bb486daaae9.
The commit incorrectly assumed that fork path always performed
threadgroup_change_begin/end() and depended on that for
synchronization against task exit and cgroup migration paths instead
of explicitly grabbing task_lock().
threadgroup_change is not locked when forking a new process (as
opposed to a new thread in the same process) and even if it were it
wouldn't be effective as different processes use different threadgroup
locks.
Revert the incorrect optimization.
Signed-off-by: Tejun Heo <tj@kernel.org>
LKML-Reference: <20121008020000.GB2575@localhost>
Acked-by: Li Zefan <lizefan@huawei.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: stable@vger.kernel.org
Diffstat (limited to 'kernel/utsname_sysctl.c')
0 files changed, 0 insertions, 0 deletions