[PATCH 6/6] mm,oom: Stop clearing TIF_MEMDIE on remote thread.

[Tetsuo Handa <penguin-kernel@xxxxxxxxxxxxxxxxxxx>]

>From fefcbf2412e38b006281cf1d20f9e3a2bb76714f Mon Sep 17 00:00:00 2001
From: Tetsuo Handa <penguin-kernel@xxxxxxxxxxxxxxxxxxx>
Date: Fri, 8 Jul 2016 00:42:48 +0900
Subject: [PATCH 6/6] mm,oom: Stop clearing TIF_MEMDIE on remote thread.

Since oom_has_pending_mm() controls whether to select next OOM victim,
we are no longer clearing TIF_MEMDIE on remote thread.

Signed-off-by: Tetsuo Handa <penguin-kernel@xxxxxxxxxxxxxxxxxxx>
---
 include/linux/oom.h | 2 +-
 kernel/exit.c       | 2 +-
 mm/oom_kill.c       | 5 ++---
 3 files changed, 4 insertions(+), 5 deletions(-)

diff --git a/include/linux/oom.h b/include/linux/oom.h
index 27be4ba..90e98ea 100644
--- a/include/linux/oom.h
+++ b/include/linux/oom.h
@@ -90,7 +90,7 @@ extern enum oom_scan_t oom_scan_process_thread(struct oom_control *oc,
 
 extern bool out_of_memory(struct oom_control *oc);
 
-extern void exit_oom_victim(struct task_struct *tsk);
+extern void exit_oom_victim(void);
 
 extern int register_oom_notifier(struct notifier_block *nb);
 extern int unregister_oom_notifier(struct notifier_block *nb);
diff --git a/kernel/exit.c b/kernel/exit.c
index 84ae830..1b1dada 100644
--- a/kernel/exit.c
+++ b/kernel/exit.c
@@ -511,7 +511,7 @@ static void exit_mm(struct task_struct *tsk)
 	mm_update_next_owner(mm);
 	mmput(mm);
 	if (test_thread_flag(TIF_MEMDIE))
-		exit_oom_victim(tsk);
+		exit_oom_victim();
 }
 
 static struct task_struct *find_alive_thread(struct task_struct *p)
diff --git a/mm/oom_kill.c b/mm/oom_kill.c
index b6b79ae..d120cb1 100644
--- a/mm/oom_kill.c
+++ b/mm/oom_kill.c
@@ -632,10 +632,9 @@ void mark_oom_victim(struct task_struct *tsk)
 /**
  * exit_oom_victim - note the exit of an OOM victim
  */
-void exit_oom_victim(struct task_struct *tsk)
+void exit_oom_victim(void)
 {
-	if (!test_and_clear_tsk_thread_flag(tsk, TIF_MEMDIE))
-		return;
+	clear_thread_flag(TIF_MEMDIE);
 
 	if (!atomic_dec_return(&oom_victims))
 		wake_up_all(&oom_victims_wait);
-- 
1.8.3.1

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