linux-kernel - Re: [PATCH V2] smp: Give WARN()ing when calling smp_call_function

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Date:	Wed, 20 Feb 2013 09:06:43 +0800
From:	Fengguang Wu <fengguang.wu@...el.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Chuansheng Liu <chuansheng.liu@...el.com>, mingo@...nel.org,
	peterz@...radead.org, jbeulich@...e.com,
	paulmck@...ux.vnet.ibm.com, mina86@...a86.org,
	srivatsa.bhat@...ux.vnet.ibm.com, linux-kernel@...r.kernel.org,
	jun.zhang@...el.com
Subject: Re: [PATCH V2] smp: Give WARN()ing when calling
 smp_call_function_many()/single() in serving irq

On Tue, Feb 19, 2013 at 03:01:23PM -0800, Andrew Morton wrote:
> On Mon, 18 Feb 2013 09:38:52 +0800
> Fengguang Wu <fengguang.wu@...el.com> wrote:
> 
> > Chuansheng,
> > 
> > It works fine on tip/next. Thanks for the fix!
> > 
> > Tested-by: Fengguang Wu <fengguang.wu@...el.com>
> 
> How did you test this?  What did you do?

I used the same kconfig to build a kernel from tip/next HEAD *plus*
the v2 patch. The result is, no smp_call_function_single/many warnings
are observed.

> afacit the patch adds additional warnings, so you must have had some
> buggy code and with the patch, runtime warnings are generated which
> inform you of that bug?

Andrew, the background is: Ingo has *reverted* the original patch that
triggered the smp_call_function_single warning from his tip tree, so
the test result means this patch's warning messages won't trigger in
my test boots.

Thanks,
Fengguang
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