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| author | Paul Menage <menage@google.com> | 2009-01-07 18:07:44 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2009-01-08 08:31:03 -0800 |
| commit | a47295e6bc42ad35f9c15ac66f598aa24debd4e2 (patch) | |
| tree | cb765e996ef35ae88e29d60796655d0d35e8cf5e /kernel/itimer.c | |
| parent | e7b80bb695a5b64c92e314838e083b2f3bdf29b2 (diff) | |
| download | blackbird-op-linux-a47295e6bc42ad35f9c15ac66f598aa24debd4e2.tar.gz blackbird-op-linux-a47295e6bc42ad35f9c15ac66f598aa24debd4e2.zip | |
cgroups: make cgroup_path() RCU-safe
Fix races between /proc/sched_debug by freeing cgroup objects via an RCU
callback. Thus any cgroup reference obtained from an RCU-safe source will
remain valid during the RCU section. Since dentries are also RCU-safe,
this allows us to traverse up the tree safely.
Additionally, make cgroup_path() check for a NULL cgrp->dentry to avoid
trying to report a path for a partially-created cgroup.
[lizf@cn.fujitsu.com: call deactive_super() in cgroup_diput()]
Signed-off-by: Paul Menage <menage@google.com>
Reviewed-by: Li Zefan <lizf@cn.fujitsu.com>
Tested-by: Li Zefan <lizf@cn.fujitsu.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'kernel/itimer.c')
0 files changed, 0 insertions, 0 deletions
