linux-kernel - [tip:x86/uv] x86/UV: Check for alloc_cpumask_var() failures properly in uv_nmi

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Date:	Tue, 24 Sep 2013 01:38:16 -0700
From:	tip-bot for Ingo Molnar <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...nel.org,
	travis@....com, tglx@...utronix.de
Subject: [tip:x86/uv] x86/UV: Check for alloc_cpumask_var()
  failures properly in uv_nmi_setup()

Commit-ID:  8a1f4653f27ffd5d61088cf6b95c39bb13bf6132
Gitweb:     http://git.kernel.org/tip/8a1f4653f27ffd5d61088cf6b95c39bb13bf6132
Author:     Ingo Molnar <mingo@...nel.org>
AuthorDate: Tue, 24 Sep 2013 09:52:40 +0200
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Tue, 24 Sep 2013 09:52:40 +0200

x86/UV: Check for alloc_cpumask_var() failures properly in uv_nmi_setup()

GCC warned about:

   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’

The reason is this code:

        alloc_cpumask_var(&uv_nmi_cpu_mask, GFP_KERNEL);
        BUG_ON(!uv_nmi_cpu_mask);

which is not the way to check for alloc_cpumask_var() failures - its
return code should be checked instead.

Cc: Mike Travis <travis@....com>
Link: http://lkml.kernel.org/n/tip-2pXRemsjupmvonbpmmnzleo1@git.kernel.org
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 arch/x86/platform/uv/uv_nmi.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/arch/x86/platform/uv/uv_nmi.c b/arch/x86/platform/uv/uv_nmi.c
index c171ca5..9126dfb 100644
--- a/arch/x86/platform/uv/uv_nmi.c
+++ b/arch/x86/platform/uv/uv_nmi.c
@@ -660,8 +660,7 @@ void uv_nmi_setup(void)
 		}
 		uv_hub_nmi_per(cpu) = uv_hub_nmi_list[nid];
 	}
-	alloc_cpumask_var(&uv_nmi_cpu_mask, GFP_KERNEL);
-	BUG_ON(!uv_nmi_cpu_mask);
+	BUG_ON(!alloc_cpumask_var(&uv_nmi_cpu_mask, GFP_KERNEL));
 }
 
 
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