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@kernel.org
Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Signed-off-by: Michal Hocko <mhocko@suse.com>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: David Rientjes <rientjes@google.com>
Cc: Vladimir Davydov <vdavydov@parallels.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

diff --git a/include/linux/oom.h b/include/linux/oom.h
index 0f1b9da108e4539ef6d91783a3b4f0cb835bf5a6..b4e36e92bc878f94d013b72eec7c44a16d8096e9 100644 (file)
--- a/include/linux/oom.h
+++ b/include/linux/oom.h
@@ -69,7 +69,7 @@ extern unsigned long oom_badness(struct task_struct *p,
 
 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 091a78be3b09d5669d9c10b98f6300e4171d2413..fb66ec7566d58a60c065f18b68458edaa3b7a650 100644 (file)
--- 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 895a51fe8e18556164d2d7474a398e41c94db81a..3b990544db6d2989cd2a79c9f26bf66f1c9ee5ba 100644 (file)
--- a/mm/oom_kill.c
+++ b/mm/oom_kill.c
@@ -662,10 +662,9 @@ static 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);