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| author | Kirill Tkhai <ktkhai@parallels.com> | 2014-10-28 08:24:34 +0300 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2014-11-04 07:07:30 +0100 |
| commit | f7b8a47da17c9ee4998f2ca2018fcc424e953c0e (patch) | |
| tree | 90a76aa80a49f4a93b1dc162a26323f4661e893d /kernel/pid_namespace.c | |
| parent | 980d0d51b1c9617a472b2c0fcbe33d2d15eadc4c (diff) | |
| download | blackbird-obmc-linux-f7b8a47da17c9ee4998f2ca2018fcc424e953c0e.tar.gz blackbird-obmc-linux-f7b8a47da17c9ee4998f2ca2018fcc424e953c0e.zip | |
sched: Remove lockdep check in sched_move_task()
sched_move_task() is the only interface to change sched_task_group:
cpu_cgrp_subsys methods and autogroup_move_group() use it.
Everything is synchronized by task_rq_lock(), so cpu_cgroup_attach()
is ordered with other users of sched_move_task(). This means we do no
need RCU here: if we've dereferenced a tg here, the .attach method
hasn't been called for it yet.
Thus, we should pass "true" to task_css_check() to silence lockdep
warnings.
Fixes: eeb61e53ea19 ("sched: Fix race between task_group and sched_task_group")
Reported-by: Oleg Nesterov <oleg@redhat.com>
Reported-by: Fengguang Wu <fengguang.wu@intel.com>
Signed-off-by: Kirill Tkhai <ktkhai@parallels.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Link: http://lkml.kernel.org/r/1414473874.8574.2.camel@tkhai
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'kernel/pid_namespace.c')
0 files changed, 0 insertions, 0 deletions
