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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>
This commit is contained in:
Pavel Emelyanov 2008-03-19 17:00:45 -07:00 committed by Linus Torvalds
parent 0cf01f6685
commit 52ea27eb4c
1 changed files with 1 additions and 1 deletions
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2
mm/memcontrol.c
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@ -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);