Re: [PATCH v2 1/2] Replace if statement with WARN_ON_ONCE() incmci_rediscover().

From: Borislav Petkov
Date: Tue Oct 23 2012 - 09:14:21 EST

On Tue, Oct 23, 2012 at 06:34:33PM +0800, Miao Xie wrote:
> So we add this WARN_ON_ONCE(), it can tell the developers that there
> is something wrong in the code if it is triggered.

First of all, the WARN_ON_ONCE will fire only once during system
lifetime (well, doh, of course) which diminishes debuggability
significantly and then, the only other place which deals with
CPU_POST_DEAD is kernel/stop_machine.c:cpu_stop_cpu_callback.

So, just to sum up and finish this fruitless discussion:
cmci_rediscover() correctly ignores the dying cpu and there's
*absolutely* no need to warn.

If you still think there is, you have to come up with a concrete example
and a way for others to reproduce it. Then we can talk.

End of story.

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