linux-kernel - Re: [PATCH 0/7] x86/UV/KDB/NMI: Updates for NMI/KDB handler for SGI UV

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Date:	Tue, 24 Sep 2013 06:51:57 -0700
From:	Mike Travis <travis@....com>
To:	Ingo Molnar <mingo@...nel.org>
CC:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Paul Mackerras <paulus@...ba.org>,
	Ingo Molnar <mingo@...hat.com>,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	Jason Wessel <jason.wessel@...driver.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Dimitri Sivanich <sivanich@....com>,
	Hedi Berriche <hedi@....com>, x86@...nel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/7] x86/UV/KDB/NMI: Updates for NMI/KDB handler for SGI
 UV



On 9/24/2013 12:52 AM, Ingo Molnar wrote:
> 
> Hm, do you test-build your patches? 

Both build and test incessantly...

This series produces the following
> annoying warning:
> 
>  arch/x86/platform/uv/uv_nmi.c: In function ‘uv_nmi_setup’:
>  arch/x86/platform/uv/uv_nmi.c:664:2: warning: the address of ‘uv_nmi_cpu_mask’ will always evaluate as ‘true’ [-Waddress]

I didn't hit the above warning since I never tried building without
CONFIG_CPUMASK_OFFSTACK defined.  I wonder if uv_nmi.c should not
be built if not on an enterprise sized system?

> 
> This:
> 
>         alloc_cpumask_var(&uv_nmi_cpu_mask, GFP_KERNEL);
>         BUG_ON(!uv_nmi_cpu_mask);
> 
> 
> the way to check for allocation failures is by checking the return value 
> of alloc_cpumask_var():
> 
> 	BUG_ON(!alloc_cpumask_var(&uv_nmi_cpu_mask, GFP_KERNEL));
> 
> I've fixed this in the patch.

Thanks!!  I should have remembered this since it was my code. (doh!)
> 
> Thanks,
> 
> 	Ingo
> 
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