mm,oom_reaper: remove pointless kthread_run() error check

Since oom_init() is called before userspace processes start, memory
allocation failure for creating the OOM reaper kernel thread will let
the OOM killer call panic() rather than wake up the OOM reaper.

Link: http://lkml.kernel.org/r/1510137800-4602-1-git-send-email-penguin-kernel@I-love.SAKURA.ne.jp
Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Acked-by: Michal Hocko <mhocko@suse.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/mm/oom_kill.c b/mm/oom_kill.c
index 26add8a0d1f7a8e50fb443482f5eec487631384f..a501a0a1f0f899b1a61f534632ba8573e6fb85c9 100644 (file)
--- a/mm/oom_kill.c
+++ b/mm/oom_kill.c
@@ -640,9 +640,6 @@ static int oom_reaper(void *unused)
 
 static void wake_oom_reaper(struct task_struct *tsk)
 {
-       if (!oom_reaper_th)
-               return;
-
        /* tsk is already queued? */
        if (tsk == oom_reaper_list || tsk->oom_reaper_list)
                return;
@@ -660,11 +657,6 @@ static void wake_oom_reaper(struct task_struct *tsk)
 static int __init oom_init(void)
 {
        oom_reaper_th = kthread_run(oom_reaper, NULL, "oom_reaper");
-       if (IS_ERR(oom_reaper_th)) {
-               pr_err("Unable to start OOM reaper %ld. Continuing regardless\n",
-                               PTR_ERR(oom_reaper_th));
-               oom_reaper_th = NULL;
-       }
        return 0;
 }
 subsys_initcall(oom_init)