All of lore.kernel.org
 help / color / mirror / Atom feed
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

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=437D92C5.1060902@ccoss.com.cn \
    --to=liyu@ccoss.com.cn \
    --cc=linux-kernel@vger.kernel.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.