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authorPavel Emelyanov <xemul@openvz.org>2008-03-20 03:00:45 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2008-03-20 04:53:35 +0300
commit52ea27eb4cd5f250f33638029a134ff03c5e6bbb (patch)
tree56397e15561f77a3aed272c006c275e63f611091
parent0cf01f6685bef41dea37bbec606f375b7a98fd98 (diff)
downloadlinux-52ea27eb4cd5f250f33638029a134ff03c5e6bbb.tar.xz
memcgroup: fix check for thread being a group leader in memcgroup
The check t->pid == t->pid is not the blessed way to check whether a task is a group leader. This is not about the code beautifulness only, but about pid namespaces fixes - both the tgid and the pid fields on the task_struct are (slowly :( ) becoming deprecated. Besides, the thread_group_leader() macro makes only one dereference :) Signed-off-by: Pavel Emelyanov <xemul@openvz.org> Cc: Balbir Singh <balbir@linux.vnet.ibm.com> Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: Paul Menage <menage@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--mm/memcontrol.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 8b9f6cae938e..9b648bd63451 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -1079,7 +1079,7 @@ static void mem_cgroup_move_task(struct cgroup_subsys *ss,
* Only thread group leaders are allowed to migrate, the mm_struct is
* in effect owned by the leader
*/
- if (p->tgid != p->pid)
+ if (!thread_group_leader(p))
goto out;
css_get(&mem->css);