linux-kernel - Re: [PATCH -v2] use per cpu data for single cpu ipi calls

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Message-Id: <1233254680.4495.126.camel@laptop>
Date:	Thu, 29 Jan 2009 19:44:40 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Steven Rostedt <rostedt@...dmis.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Rusty Russell <rusty@...tcorp.com.au>, npiggin@...e.de,
	Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	Arjan van de Ven <arjan@...radead.org>,
	jens.axboe@...cle.com
Subject: Re: [PATCH -v2] use per cpu data for single cpu ipi calls

On Thu, 2009-01-29 at 10:39 -0800, Linus Torvalds wrote:

> But you're right, I'm still not seeing anything that looks _likely_ to be 
> a problem. But I worry that it's something somebody may want to do.

Well, the kgdb case I looked at did exactly that, and that is a problem.

As for people wanting to do it, we have __smp_call_function_single() to
do just that, all you have to do is provide your own csd.



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