linux-kernel - Re: [PATCH -mm] x86_64 UP needs smp_call_function

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Message-Id: <1164878540.11036.29.camel@earth>
Date:	Thu, 30 Nov 2006 10:22:20 +0100
From:	Ingo Molnar <mingo@...hat.com>
To:	Andrew Morton <akpm@...l.org>
Cc:	Randy Dunlap <randy.dunlap@...cle.com>,
	lkml <linux-kernel@...r.kernel.org>, ak@...e.de
Subject: Re: [PATCH -mm] x86_64 UP needs smp_call_function_single

On Wed, 2006-11-29 at 23:54 -0800, Andrew Morton wrote:
> which is somewhat unpleasant.  I added a WARN_ON(irqs_disabled()) to
> the
> out-of-line SMP version.

ok.
> 
> btw, does anyone know why the SMP versions of this function use
> spin_lock_bh(&call_lock)?

that makes no sense (neither the get_cpu()/put_cpu() gymnastics) if this
is called with irqs disabled all the time.

	Ingo
> 

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