Re: [Question] I doublt on spin_lock again.

[liyu <liyu@ccoss.com.cn>]

Zhang Le wrote:

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> liyu wrote:
>
> | 1. I found these use spin_lock(&rq->lock) in set_user_nice(), but
> | not disable interrput ( e.g.  when sys_nice() call it ),  if the
> | one timer interrput come before we unlock the spin_lock, Shall we
> | dead lock here?  Since the scheduler_tick() may try to hold the
> | same lock.
>
> set_user_nice() -> task_rq_lock -> local_irq_save()
>
> |
> | 2. # define __acquires(x)    __attribute__((context(0,1))) # define
> | __releases(x)    __attribute__((context(1,0))) # define
> | __acquire(x)    __context__(1) # define __release(x)
> | __context__(-1)
>
> info gcc
>
> BTW, have you ever read "HOWTO do Linux kernel development" be Greg?
> Do it, if you haven't
>
> - --
> Zhang Le, Robert
> Linux Engineer/Trainer
>
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Thanks first.

1.  I know local_irq_save() in task_rq_lock(), but it only save FLAGS 
register to one unsigned long variable, but not disable maskable interrupt.
2. OK, I am going to get it.

-liyu