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| author | Lai Jiangshan <laijs@cn.fujitsu.com> | 2009-01-07 18:07:40 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2009-01-08 08:31:03 -0800 |
| commit | 7534432dcc3c654a8671b6b0cdffd1dbdbc73074 (patch) | |
| tree | 65a5010c8bc5062d004fd1ede32e8f7ba64f6eec | |
| parent | 77efecd9e0526327548152df715ab8644ecb5ba0 (diff) | |
| download | linux-stable-7534432dcc3c654a8671b6b0cdffd1dbdbc73074.tar.gz linux-stable-7534432dcc3c654a8671b6b0cdffd1dbdbc73074.tar.bz2 linux-stable-7534432dcc3c654a8671b6b0cdffd1dbdbc73074.zip | |
cgroups: remove rcu_read_lock() in cgroupstats_build()
cgroup_iter_* do not need rcu_read_lock().
In cgroup_enable_task_cg_lists(), do_each_thread() and while_each_thread()
are protected by RCU, it's OK, for write_lock(&css_set_lock) implies
rcu_read_lock() in non-RT kernel.
If we need explicit rcu_read_lock(), we should add rcu_read_lock() in
cgroup_enable_task_cg_lists(), not cgroup_iter_*.
Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com>
Acked-by: Paul Menage <menage@google.com>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Pavel Emelyanov <xemul@openvz.org>
Cc: Balbir Singh <balbir@in.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| -rw-r--r-- | kernel/cgroup.c | 2 |
1 files changed, 0 insertions, 2 deletions
diff --git a/kernel/cgroup.c b/kernel/cgroup.c index 61e92c5867ea..f55af3daffc2 100644 --- a/kernel/cgroup.c +++ b/kernel/cgroup.c @@ -2055,7 +2055,6 @@ int cgroupstats_build(struct cgroupstats *stats, struct dentry *dentry) ret = 0; cgrp = dentry->d_fsdata; - rcu_read_lock(); cgroup_iter_start(cgrp, &it); while ((tsk = cgroup_iter_next(cgrp, &it))) { @@ -2080,7 +2079,6 @@ int cgroupstats_build(struct cgroupstats *stats, struct dentry *dentry) } cgroup_iter_end(cgrp, &it); - rcu_read_unlock(); err: return ret; } |