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From: liyu <liyu@ccoss.com.cn>
To: unlisted-recipients:; (no To-header on input)
Cc: LKML <linux-kernel@vger.kernel.org>
Subject: [Question] spin_lock in interrupt handler.
Date: Fri, 18 Nov 2005 16:37:25 +0800	[thread overview]
Message-ID: <437D92C5.1060902@ccoss.com.cn> (raw)
In-Reply-To: <200511172057.33131.kernel@kolivas.org>

Hi, every one in LKML.

    I have one question about how to use spin_lock.

    I read Documentation/spinlocks.txt wrote by Linus. The Lesson 1 and 
2 are simple for me.
But I confused in Lesson 3. The most doublt is why we can not use 
spin_lock_irq*() version in
interrupt handler?

    At i386, I known the interrupt is disabled in interrupt handler. I 
think this feature is
supplied in handware-level. The spin_lock_irqrestore() will use  'sti'  
instruction internal, it will change interrupt mask bit in FLAGS 
register, do this have re-enable interrupt, even in interrput handler? I 
can not sure this.

    Thanks in advanced.

-liyu
   



  reply	other threads:[~2005-11-18  8:37 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2005-11-15 10:18 [Question]How to restrict some kind of task? liyu
2005-11-15 10:21 ` Con Kolivas
2005-11-16  1:16   ` liyu
2005-11-17  6:20     ` liyu
2005-11-17  9:57       ` Con Kolivas
2005-11-18  8:37         ` liyu [this message]
2005-11-18 22:44           ` [Question] spin_lock in interrupt handler Steven Rostedt
2005-11-21  1:13             ` liyu

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