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kthread: fix return value of kthread_create() upon SIGKILL.

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Commit 786235eeba0e ("kthread: make kthread_create() killable") meant
for allowing kthread_create() to abort as soon as killed by the
OOM-killer.  But returning -ENOMEM is wrong if killed by SIGKILL from
userspace.  Change kthread_create() to return -EINTR upon SIGKILL.

Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Cc: Oleg Nesterov <oleg@redhat.com>
Acked-by: David Rientjes <rientjes@google.com>
Cc: <stable@vger.kernel.org> [3.13+]
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Tetsuo Handa 2014-06-04 16:05:36 -07:00 committed by Linus Torvalds
parent c177c81e09
commit 8fe6929cfd
1 changed files with 2 additions and 2 deletions
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4
kernel/kthread.c
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@ -262,7 +262,7 @@ static void create_kthread(struct kthread_create_info *create)
* kthread_stop() has been called). The return value should be zero * kthread_stop() has been called). The return value should be zero
* or a negative error number; it will be passed to kthread_stop(). * or a negative error number; it will be passed to kthread_stop().
* *
* Returns a task_struct or ERR_PTR(-ENOMEM). * Returns a task_struct or ERR_PTR(-ENOMEM) or ERR_PTR(-EINTR).
*/ */
struct task_struct *kthread_create_on_node(int (*threadfn)(void *data), struct task_struct *kthread_create_on_node(int (*threadfn)(void *data),
void *data, int node, void *data, int node,
@ -298,7 +298,7 @@ struct task_struct *kthread_create_on_node(int (*threadfn)(void *data),
* that thread. * that thread.
*/ */
if (xchg(&create->done, NULL)) if (xchg(&create->done, NULL))
return ERR_PTR(-ENOMEM); return ERR_PTR(-EINTR);
/* /*
* kthreadd (or new kernel thread) will call complete() * kthreadd (or new kernel thread) will call complete()
* shortly. * shortly.