linux-kernel - Re: [PATCH 1/10] Add generic helpers for arch IPI function calls

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Message-ID: <27854.1209732644@ocs10w>
Date:	Fri, 02 May 2008 22:50:44 +1000
From:	Keith Owens <kaos@....com.au>
To:	paulmck@...ux.vnet.ibm.com
cc:	Nick Piggin <npiggin@...e.de>, Jens Axboe <jens.axboe@...cle.com>,
	linux-kernel@...r.kernel.org, peterz@...radead.org,
	linux-arch@...r.kernel.org, jeremy@...p.org, mingo@...e.hu
Subject: Re: [PATCH 1/10] Add generic helpers for arch IPI function calls 

"Paul E. McKenney" (on Fri, 2 May 2008 05:29:55 -0700) wrote:
>OK -- for some reason, I was thinking that it was illegal to
>invoke smp_call_function() with irqs disabled...
>
>Ah, I see it -- smp_call_function_mask() says:
>
> * You must not call this function with disabled interrupts or from a
> * hardware interrupt handler or from a bottom half handler.
>
>So we have no problem with smp_call_function, then.
>
>OK, so smp_call_function() -can- be invoked with irqs disabled?
>Hmmm...  I will give this some thought.

Doing any smp_call_function with interrupts disabled is a potential
deadlock.  See http://lkml.org/lkml/2004/5/2/116.

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