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From: Michal Hocko <mhocko@kernel.org>
Subject: [PATCH 07/10] mm, oom: enforce exit_oom_victim on current task
Date: Thu, 28 Jul 2016 21:42:31 +0200
Message-Id: <1469734954-31247-8-git-send-email-mhocko@kernel.org>
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References: <1469734954-31247-1-git-send-email-mhocko@kernel.org>
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To: linux-mm@kvack.org
Cc: Andrew Morton <akpm@linux-foundation.org>, Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>, Oleg Nesterov <oleg@redhat.com>, David Rientjes <rientjes@google.com>, Vladimir Davydov <vdavydov@parallels.com>, Michal Hocko <mhocko@suse.com>

From: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>

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

Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Signed-off-by: Michal Hocko <mhocko@suse.com>
---
 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 14a0f15c0c59..22e18c4adc98 100644
--- a/include/linux/oom.h
+++ b/include/linux/oom.h
@@ -102,7 +102,7 @@ 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 9e6e1356e6bb..c742c37c3a92 100644
--- a/kernel/exit.c
+++ b/kernel/exit.c
@@ -435,7 +435,7 @@ 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 300957e59246..ca1cc24ba720 100644
--- a/mm/oom_kill.c
+++ b/mm/oom_kill.c
@@ -651,10 +651,9 @@ 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);
-- 
2.8.1

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