Re: [PATCH V2] smp: Give WARN()ing when callingsmp_call_function_many()/single() in serving irq

From: Fengguang Wu
Date: Tue Feb 19 2013 - 20:06:53 EST

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@xxxxxxxxx> wrote:
> > Chuansheng,
> >
> > It works fine on tip/next. Thanks for the fix!
> >
> > Tested-by: Fengguang Wu <fengguang.wu@xxxxxxxxx>
> 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.

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