diff options
| author | Li Zefan <lizf@cn.fujitsu.com> | 2008-07-25 01:46:54 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2008-07-25 10:53:35 -0700 |
| commit | 7e9abd89cbdf9b73d327d8173343abce9022609b (patch) | |
| tree | 7e738e46ba5e384fc6bc984196ed2d09a0ea8102 /kernel/cgroup.c | |
| parent | 9d96d82da437ed5f2053821779ed5d7797ed1f81 (diff) | |
| download | lwn-7e9abd89cbdf9b73d327d8173343abce9022609b.tar.gz lwn-7e9abd89cbdf9b73d327d8173343abce9022609b.zip | |
cgroup: use read lock to guard find_existing_css_set()
The function does not modify anything (except the temporary css template), so
it's sufficient to hold read lock.
Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
Acked-by: Paul Menage <menage@google.com>
Cc: Balbir Singh <balbir@linux.vnet.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'kernel/cgroup.c')
| -rw-r--r-- | kernel/cgroup.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/kernel/cgroup.c b/kernel/cgroup.c index 15ac0e1e4f4d..f50edadfdd86 100644 --- a/kernel/cgroup.c +++ b/kernel/cgroup.c @@ -415,11 +415,11 @@ static struct css_set *find_css_set( /* First see if we already have a cgroup group that matches * the desired set */ - write_lock(&css_set_lock); + read_lock(&css_set_lock); res = find_existing_css_set(oldcg, cgrp, template); if (res) get_css_set(res); - write_unlock(&css_set_lock); + read_unlock(&css_set_lock); if (res) return res; |