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authorLi Zefan <lizf@cn.fujitsu.com>2008-07-25 01:46:54 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2008-07-25 10:53:35 -0700
commit7e9abd89cbdf9b73d327d8173343abce9022609b (patch)
tree7e738e46ba5e384fc6bc984196ed2d09a0ea8102 /kernel
parent9d96d82da437ed5f2053821779ed5d7797ed1f81 (diff)
downloadop-kernel-dev-7e9abd89cbdf9b73d327d8173343abce9022609b.zip
op-kernel-dev-7e9abd89cbdf9b73d327d8173343abce9022609b.tar.gz
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')
-rw-r--r--kernel/cgroup.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/kernel/cgroup.c b/kernel/cgroup.c
index 15ac0e1..f50edad 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;
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