[PATCH] topology: Fix compilation warning when not in SMP

* [PATCH] topology: Fix compilation warning when not in SMP
@ 2014-04-04  6:43 Vincent Stehlé
  2014-04-04 23:49 ` Greg Kroah-Hartman
  0 siblings, 1 reply; 4+ messages in thread
From: Vincent Stehlé @ 2014-04-04  6:43 UTC (permalink / raw)
  To: linux-kernel, linux-next, stable; +Cc: Vincent Stehlé, Greg Kroah-Hartman

The topology_##name() macro does not use its argument when CONFIG_SMP is not
set, as it ultimately calls the cpu_data() macro.

So we avoid maintaining a possibly unused `cpu' variable, to avoid the
following compilation warning:

  drivers/base/topology.c: In function ‘show_physical_package_id’:
  drivers/base/topology.c:103:118: warning: unused variable ‘cpu’ [-Wunused-variable]
   define_id_show_func(physical_package_id);

  drivers/base/topology.c: In function ‘show_core_id’:
  drivers/base/topology.c:106:106: warning: unused variable ‘cpu’ [-Wunused-variable]
   define_id_show_func(core_id);

This can be seen with e.g. x86 defconfig and CONFIG_SMP not set.

Signed-off-by: Vincent Stehlé <vincent.stehle@laposte.net>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: <stable@vger.kernel.org> # 3.10.x
Cc: <stable@vger.kernel.org> # 3.13.x
Cc: <stable@vger.kernel.org> # 3.14.x
---
 drivers/base/topology.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/base/topology.c b/drivers/base/topology.c
index ad9d177..c928576 100644
--- a/drivers/base/topology.c
+++ b/drivers/base/topology.c
@@ -39,8 +39,7 @@
 static ssize_t show_##name(struct device *dev,			\
 		struct device_attribute *attr, char *buf)	\
 {								\
-	unsigned int cpu = dev->id;				\
-	return sprintf(buf, "%d\n", topology_##name(cpu));	\
+	return sprintf(buf, "%d\n", topology_##name(dev->id));	\
 }
 
 #if defined(topology_thread_cpumask) || defined(topology_core_cpumask) || \
-- 
1.9.1

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