linux-kernel - Re: [PATCH] spinlock: rm duplicated preempt en/disable for bottom half

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Date:	Tue, 27 Sep 2011 11:13:56 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Bob Liu <lliubbo@...il.com>
Cc:	linux-kernel@...r.kernel.org, mingo@...e.hu, joe@...ches.com,
	tglx@...utronix.de
Subject: Re: [PATCH] spinlock: rm duplicated preempt en/disable for bottom
 half

On Tue, 2011-09-27 at 15:56 +0800, Bob Liu wrote:
> local_bh_en/disable() has already deal with en/disable preempt, so rm the
> dumplicated one from spinlock_api_up/smp.h head file.

I bet you haven't tried booting this..  you just broke stuff like:

  spin_lock_bh(&foo);
  /* do crap */
  spin_unlock(&foo);
  /* do some other crap */
  local_bh_enable();


And yes that does happen.

  
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