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Groups > linux.kernel > #1383365
| From | Peter Zijlstra <peterz@infradead.org> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | Re: [PATCH v3 2/6] sched/rtmutex/deadline: Fix a PI crash for deadline tasks |
| Date | 2016-04-20 15:20 +0200 |
| Message-ID | <rq0cV-8rY-3@gated-at.bofh.it> (permalink) |
| References | <rnNMR-Ww-3@gated-at.bofh.it> <rnNMR-Ww-9@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
On Thu, Apr 14, 2016 at 07:37:03PM +0800, Xunlei Pang wrote:
> + /* Updated under pi_lock and rtmutex lock */
> struct rb_node *pi_waiters_leftmost;
> + struct rb_node *pi_waiters_leftmost_copy;
> struct task_struct *rt_mutex_get_top_task(struct task_struct *task)
> {
> + if (!task->pi_waiters_leftmost_copy)
> return NULL;
>
> + return rb_entry(task->pi_waiters_leftmost_copy,
> + struct rt_mutex_waiter, pi_tree_entry)->task;
> }
why ?! Why not keep a regular task_struct pointer and avoid this stuff?
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Re: [PATCH v3 2/6] sched/rtmutex/deadline: Fix a PI crash for deadline tasks Peter Zijlstra <peterz@infradead.org> - 2016-04-20 15:20 +0200
Re: [PATCH v3 2/6] sched/rtmutex/deadline: Fix a PI crash for deadline tasks Xunlei Pang <xpang@redhat.com> - 2016-04-20 15:50 +0200
Re: [PATCH v3 2/6] sched/rtmutex/deadline: Fix a PI crash for deadline tasks Xunlei Pang <xpang@redhat.com> - 2016-04-22 05:30 +0200
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