The patch titled
kthread: don't looking for a task in create_kthread()
has been added to the -mm tree. Its filename is
kthread-dont-looking-for-a-task-in-create_kthread-2.patch
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The current -mm tree may be found at http://userweb.kernel.org/~akpm/mmotm/
------------------------------------------------------
Subject: kthread: don't looking for a task in create_kthread()
From: Vitaliy Gusev <vgusev@xxxxxxxxxx>
Remove the unnecessary find_task_by_pid_ns(). kthread() can just use
"current" to get the same result.
Signed-off-by: Vitaliy Gusev <vgusev@xxxxxxxxxx>
Cc: Oleg Nesterov <oleg@xxxxxxxxxx>
Cc: Pavel Emelyanov <xemul@xxxxxxxxxx>
Cc: Christoph Hellwig <hch@xxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
kernel/kthread.c | 4 +---
1 file changed, 1 insertion(+), 3 deletions(-)
diff -puN kernel/kthread.c~kthread-dont-looking-for-a-task-in-create_kthread-2 kernel/kthread.c
--- a/kernel/kthread.c~kthread-dont-looking-for-a-task-in-create_kthread-2
+++ a/kernel/kthread.c
@@ -76,6 +76,7 @@ static int kthread(void *_create)
/* OK, tell user we're spawned, wait for stop or wakeup */
__set_current_state(TASK_UNINTERRUPTIBLE);
+ create->result = current;
complete(&create->started);
schedule();
@@ -101,9 +102,6 @@ static void create_kthread(struct kthrea
} else {
struct sched_param param = { .sched_priority = 0 };
wait_for_completion(&create->started);
- read_lock(&tasklist_lock);
- create->result = find_task_by_pid_ns(pid, &init_pid_ns);
- read_unlock(&tasklist_lock);
/*
* root may have changed our (kthreadd's) priority or CPU mask.
* The kernel thread should not inherit these properties.
_
Patches currently in -mm which might be from vgusev@xxxxxxxxxx are
kthread-dont-looking-for-a-task-in-create_kthread-2.patch
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