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Re: [PATCH 6/8] MIPS: call set_cpu_online() on the uping cpu with irq di

To: "Srivatsa S. Bhat" <>
Subject: Re: [PATCH 6/8] MIPS: call set_cpu_online() on the uping cpu with irq disabled
From: Yong Zhang <>
Date: Tue, 29 May 2012 14:52:48 +0800
Cc:,,,,, Nikunj A Dadhania <>, "Paul E. McKenney" <>,,, Ingo Molnar <>, Thomas Gleixner <>
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Reply-to: Yong Zhang <>
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On Mon, May 28, 2012 at 05:34:51PM +0530, Srivatsa S. Bhat wrote:
> No, I think you are right. Sorry for the delay in replying.
> It indeed looks like we need not use ipi_call_lock/unlock() in CPU bringup
> code..
> However, it does make me wonder about this:
> commit 3d4422332 introduced the generic ipi helpers, and reduced the scope
> of call_function.lock and also added the check in
> generic_smp_call_function_interrupt() to proceed only if the cpu is present
> in data->cpumask.
> Then, commit 3b16cf8748 converted x86 to the generic ipi helpers, but while
> doing that, it explicitly retained ipi_call_lock/unlock(), which is kind of
> surprising.. I guess it was a mistake rather than intentional.

Agree. I think it's a mistake(or leftover) too :)

Anyway, let me cook a patch to throw a stone to clear the road.


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