Commit-ID: eff9662547f358239b98dfc4a8e6905b494e14d6
Gitweb: http://git.kernel.org/tip/eff9662547f358239b98dfc4a8e6905b494e14d6
Author: Oleg Nesterov <oleg@xxxxxxxxxx>
AuthorDate: Tue, 29 Nov 2016 18:51:00 +0100
Committer: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
CommitDate: Thu, 8 Dec 2016 14:36:18 +0100
Revert "kthread: Pin the stack via try_get_task_stack()/put_task_stack() in to_live_kthread() function"
This reverts commit 23196f2e5f5d810578a772785807dcdc2b9fdce9.
Now that struct kthread is kmalloc'ed and not longer on the task stack
there is no need anymore to pin the stack.
Signed-off-by: Oleg Nesterov <oleg@xxxxxxxxxx>
Acked-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx>
Acked-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Chunming Zhou <David1.Zhou@xxxxxxx>
Cc: Roman Pen <roman.penyaev@xxxxxxxxxxxxxxxx>
Cc: Petr Mladek <pmladek@xxxxxxxx>
Cc: Andy Lutomirski <luto@xxxxxxxxxxxxxx>
Cc: Tejun Heo <tj@xxxxxxxxxx>
Cc: Andy Lutomirski <luto@xxxxxxxxxx>
Cc: Alex Deucher <alexander.deucher@xxxxxxx>
Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Link: http://lkml.kernel.org/r/20161129175100.GA5333@xxxxxxxxxx
Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
---
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);
--
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