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| author | Oleg Nesterov <oleg@redhat.com> | 2016-11-29 18:51:00 +0100 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2016-12-08 14:36:18 +0100 |
| commit | eff9662547f358239b98dfc4a8e6905b494e14d6 (patch) | |
| tree | eca648100a1e7f823a3bc0f12aec06443f865e17 /kernel | |
| parent | 1da5c46fa965ff90f5ffc080b6ab3fae5e227bc3 (diff) | |
| download | lwn-eff9662547f358239b98dfc4a8e6905b494e14d6.tar.gz lwn-eff9662547f358239b98dfc4a8e6905b494e14d6.zip | |
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@redhat.com>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Chunming Zhou <David1.Zhou@amd.com>
Cc: Roman Pen <roman.penyaev@profitbricks.com>
Cc: Petr Mladek <pmladek@suse.com>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Tejun Heo <tj@kernel.org>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Alex Deucher <alexander.deucher@amd.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Link: http://lkml.kernel.org/r/20161129175100.GA5333@redhat.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/kthread.c | 8 |
1 files changed, 2 insertions, 6 deletions
diff --git a/kernel/kthread.c b/kernel/kthread.c index 9d64b6526d0b..7891a940007d 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); |