From: Oleg Nesterov <oleg@redhat.com>
To: Thomas Gleixner <tglx@linutronix.de>
Cc: Andy Lutomirski <luto@amacapital.net>,
Roman Pen <roman.penyaev@profitbricks.com>,
Andy Lutomirski <luto@kernel.org>,
Peter Zijlstra <peterz@infradead.org>,
Ingo Molnar <mingo@redhat.com>, Tejun Heo <tj@kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: [PATCH 2/2] Revert "kthread: Pin the stack via try_get_task_stack()/put_task_stack() in to_live_kthread() function"
Date: Fri, 28 Oct 2016 18:12:17 +0200 [thread overview]
Message-ID: <20161028161217.GC8933@redhat.com> (raw)
In-Reply-To: <20161028161106.GA8933@redhat.com>
This reverts commit 23196f2e5f5d810578a772785807dcdc2b9fdce9.
After the previous change struct kthread can't go away, no need to pin
the stack.
TODO: kill to_live_kthread().
Signed-off-by: Oleg Nesterov <oleg@redhat.com>
---
kernel/kthread.c | 8 ++------
1 file changed, 2 insertions(+), 6 deletions(-)
diff --git a/kernel/kthread.c b/kernel/kthread.c
index 9d64b65..7891a94 100644
--- a/kernel/kthread.c
+++ b/kernel/kthread.c
@@ -88,7 +88,7 @@ void free_kthread_struct(struct task_struct *k)
static struct kthread *to_live_kthread(struct task_struct *k)
{
struct completion *vfork = ACCESS_ONCE(k->vfork_done);
- if (likely(vfork) && try_get_task_stack(k))
+ if (likely(vfork))
return __to_kthread(vfork);
return NULL;
}
@@ -473,10 +473,8 @@ void kthread_unpark(struct task_struct *k)
{
struct kthread *kthread = to_live_kthread(k);
- if (kthread) {
+ if (kthread)
__kthread_unpark(k, kthread);
- put_task_stack(k);
- }
}
EXPORT_SYMBOL_GPL(kthread_unpark);
@@ -505,7 +503,6 @@ int kthread_park(struct task_struct *k)
wait_for_completion(&kthread->parked);
}
}
- put_task_stack(k);
ret = 0;
}
return ret;
@@ -541,7 +538,6 @@ int kthread_stop(struct task_struct *k)
__kthread_unpark(k, kthread);
wake_up_process(k);
wait_for_completion(&kthread->exited);
- put_task_stack(k);
}
ret = k->exit_code;
put_task_struct(k);
--
2.5.0
next prev parent reply other threads:[~2016-10-28 16:12 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-10-25 11:05 [PATCH v3 1/1] kthread: allocate kthread structure using kmalloc Roman Pen
2016-10-25 14:03 ` Oleg Nesterov
2016-10-25 15:43 ` Oleg Nesterov
2016-10-25 16:08 ` Roman Penyaev
2016-10-25 16:17 ` Oleg Nesterov
2016-10-25 16:52 ` Andy Lutomirski
2016-10-26 14:14 ` Oleg Nesterov
2016-10-26 14:57 ` Thomas Gleixner
2016-10-26 15:51 ` Oleg Nesterov
2016-10-26 18:31 ` Thomas Gleixner
2016-10-28 16:11 ` [PATCH 0/2] kthread: make struct kthread kmalloc'ed Oleg Nesterov
2016-10-28 16:11 ` [PATCH 1/2] " Oleg Nesterov
2016-10-28 18:48 ` Thomas Gleixner
2016-10-28 16:12 ` Oleg Nesterov [this message]
2016-10-28 18:49 ` [PATCH 2/2] Revert "kthread: Pin the stack via try_get_task_stack()/put_task_stack() in to_live_kthread() function" Thomas Gleixner
2016-10-28 18:44 ` [PATCH 0/2] kthread: make struct kthread kmalloc'ed Thomas Gleixner
2016-10-31 20:07 ` [PATCH 0/2] kthread: kill to_live_kthread() Oleg Nesterov
2016-10-31 20:07 ` [PATCH 1/2] kthread: don't use to_live_kthread() in kthread_stop() Oleg Nesterov
2016-11-09 7:58 ` Thomas Gleixner
2016-10-31 20:08 ` [PATCH 2/2] kthread: don't use to_live_kthread() in kthread_park() and kthread_unpark() Oleg Nesterov
2016-11-09 8:45 ` Thomas Gleixner
2016-11-09 17:27 ` Oleg Nesterov
2016-11-10 17:19 ` [PATCH 0/1] kthread: don't abuse kthread_create_on_cpu() in __kthread_create_worker() Oleg Nesterov
2016-11-10 17:20 ` [PATCH 1/1] " Oleg Nesterov
2016-11-14 11:12 ` Petr Mladek
2016-11-14 11:09 ` [PATCH 0/1] " Petr Mladek
2016-11-07 18:23 ` [PATCH 0/2] kthread: kill to_live_kthread() Andy Lutomirski
2016-10-26 16:13 ` [PATCH v3 1/1] kthread: allocate kthread structure using kmalloc Oleg Nesterov
2016-10-27 2:56 ` Josh Poimboeuf
2016-10-27 13:10 ` Oleg Nesterov
2016-10-25 15:46 ` Roman Penyaev
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