[patch 045/127] mm, oom: enforce exit_oom_victim on current task

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From: Tetsuo Handa <penguin-kernel@xxxxxxxxxxxxxxxxxxx>
Subject: mm, oom: enforce exit_oom_victim on current task

There are no users of exit_oom_victim on !current task anymore so enforce
the API to always work on the current.

Link: http://lkml.kernel.org/r/1472119394-11342-8-git-send-email-mhocko@xxxxxxxxxx
Signed-off-by: Tetsuo Handa <penguin-kernel@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Michal Hocko <mhocko@xxxxxxxx>
Cc: Oleg Nesterov <oleg@xxxxxxxxxx>
Cc: David Rientjes <rientjes@xxxxxxxxxx>
Cc: Vladimir Davydov <vdavydov@xxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---

 include/linux/oom.h |    2 +-
 kernel/exit.c       |    2 +-
 mm/oom_kill.c       |    5 ++---
 3 files changed, 4 insertions(+), 5 deletions(-)

diff -puN include/linux/oom.h~mm-oom-enforce-exit_oom_victim-on-current-task include/linux/oom.h
--- a/include/linux/oom.h~mm-oom-enforce-exit_oom_victim-on-current-task
+++ a/include/linux/oom.h
@@ -69,7 +69,7 @@ extern unsigned long oom_badness(struct
 
 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 -puN kernel/exit.c~mm-oom-enforce-exit_oom_victim-on-current-task kernel/exit.c
--- a/kernel/exit.c~mm-oom-enforce-exit_oom_victim-on-current-task
+++ a/kernel/exit.c
@@ -511,7 +511,7 @@ static void exit_mm(struct task_struct *
 	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 -puN mm/oom_kill.c~mm-oom-enforce-exit_oom_victim-on-current-task mm/oom_kill.c
--- a/mm/oom_kill.c~mm-oom-enforce-exit_oom_victim-on-current-task
+++ a/mm/oom_kill.c
@@ -662,10 +662,9 @@ static void mark_oom_victim(struct task_
 /**
  * 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);
_
--
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