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>

1 files changed, 0 insertions, 8 deletions

diff --git a/mm/oom_kill.c b/mm/oom_kill.c
index 26add8a0d1f7..a501a0a1f0f8 100644
--- 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)