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 09:52:12 +0200
From:	Ingo Molnar <mingo@...nel.org>
To:	Mike Travis <travis@....com>
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


Hm, do you test-build your patches? 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]

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,

	Ingo
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