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| author | Tejun Heo <tj@kernel.org> | 2012-10-19 02:52:07 +0200 |
|---|---|---|
| committer | Tejun Heo <tj@kernel.org> | 2012-10-19 23:08:49 +0200 |
| commit | 9bb71308b8133d643648776243e4d5599b1c193d (patch) | |
| tree | f975fb2ffcd3d9b2ae222705836a9a142b97d350 /Kconfig | |
| parent | cgroup: notify_on_release may not be triggered in some cases (diff) | |
| download | linux-9bb71308b8133d643648776243e4d5599b1c193d.tar.xz linux-9bb71308b8133d643648776243e4d5599b1c193d.zip | |
Revert "cgroup: Drop task_lock(parent) on cgroup_fork()"
This reverts commit 7e381b0eb1e1a9805c37335562e8dc02e7d7848c.
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>
Bitterly-Acked-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: stable@vger.kernel.org
Diffstat (limited to 'Kconfig')
0 files changed, 0 insertions, 0 deletions