linux-kernel - Re: crash: IP: [<ffffffff80478092>] __bitmap

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Date:	Thu, 15 Jan 2009 09:30:01 -0800
From:	Mike Travis <travis@....com>
To:	Ingo Molnar <mingo@...e.hu>
CC:	Rusty Russell <rusty@...tcorp.com.au>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: crash: IP: [<ffffffff80478092>] __bitmap_intersects+0x48/0x73
 [PATCH supplied]

Ingo Molnar wrote:
> FYI, there's new warnings due to cpumask changes:
> 
> arch/x86/kernel/cpu/intel_cacheinfo.c: In function â€˜show_cache_disableâ€™:
> arch/x86/kernel/cpu/intel_cacheinfo.c:710: warning: unused variable â€˜maskâ€™
> arch/x86/kernel/cpu/intel_cacheinfo.c: In function â€˜store_cache_disableâ€™:
> arch/x86/kernel/cpu/intel_cacheinfo.c:745: warning: unused variable â€˜maskâ€™
> 
> on 32-bit defconfig.
> 
> 	Ingo

Hi Ingo,

You can pull the following patch to fix this build warning.

Thanks!
Mike
--- 

The following changes since commit e46d51787e23a607cac5f593ac9926743a636dff:
  Ingo Molnar (1):
        Merge branch 'master' of ssh://master.kernel.org/.../travis/linux-2.6-cpus4096-for-ingo into cpus4096

are available in the git repository at:

  ssh://master.kernel.org/pub/scm/linux/kernel/git/travis/linux-2.6-cpus4096-for-ingo master

Mike Travis (1):
      x86: fix build warning when CONFIG_NUMA not defined.

 arch/x86/include/asm/topology.h |   17 ++++++++++++++---
 1 files changed, 14 insertions(+), 3 deletions(-)

commit f2a082711905312dc7b6675e913fee0c4689f7ae
Author: Mike Travis <travis@....com>
Date:   Thu Jan 15 09:19:32 2009 -0800

    x86: fix build warning when CONFIG_NUMA not defined.
    
    Impact: fix build warning
    
    The macro cpu_to_node did not reference it's argument, and instead
    simply returned a 0.  This causes a "unused variable" warning if
    it's the only reference in a function (show_cache_disable).
    
    Replace it with the more correct inline function.
    
    Signed-off-by: Mike Travis <travis@....com>

diff --git a/arch/x86/include/asm/topology.h b/arch/x86/include/asm/topology.h
index 4e2f2e0..d0c68e2 100644
--- a/arch/x86/include/asm/topology.h
+++ b/arch/x86/include/asm/topology.h
@@ -192,9 +192,20 @@ extern int __node_distance(int, int);
 
 #else /* !CONFIG_NUMA */
 
-#define numa_node_id()		0
-#define	cpu_to_node(cpu)	0
-#define	early_cpu_to_node(cpu)	0
+static inline int numa_node_id(void)
+{
+	return 0;
+}
+
+static inline int cpu_to_node(int cpu)
+{
+	return 0;
+}
+
+static inline int early_cpu_to_node(int cpu)
+{
+	return 0;
+}
 
 static inline const cpumask_t *cpumask_of_node(int node)
 {
--
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