Isolate some explicit usage of task->tgid

With pid namespaces this field is now dangerous to use explicitly, so hide
it behind the helpers.

Also the pid and pgrp fields o task_struct and signal_struct are to be
deprecated.  Unfortunately this patch cannot be sent right now as this
leads to tons of warnings, so start isolating them, and deprecate later.

Actually the p->tgid == pid has to be changed to has_group_leader_pid(),
but Oleg pointed out that in case of posix cpu timers this is the same, and
thread_group_leader() is more preferable.

Signed-off-by: Pavel Emelyanov <xemul@openvz.org>
Acked-by: Oleg Nesterov <oleg@tv-sign.ru>
Cc: Sukadev Bhattiprolu <sukadev@us.ibm.com>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 1 insertions, 1 deletions

diff --git a/mm/oom_kill.c b/mm/oom_kill.c
index a7cb4c43fd11..e3778f1215c0 100644
--- a/mm/oom_kill.c
+++ b/mm/oom_kill.c
@@ -326,7 +326,7 @@ static int oom_kill_task(struct task_struct *p)
          * to memory reserves though, otherwise we might deplete all memory.
          */
         do_each_thread(g, q) {
-                if (q->mm == mm && q->tgid != p->tgid)
+                if (q->mm == mm && !same_thread_group(q, p))
                         force_sig(SIGKILL, q);
         } while_each_thread(g, q);