[PATCH percpu#for-next] percpu: remove compile warnings caused by__verify_pcpu_ptr()

[Tejun Heo]

If percpu pointer is const, __verify_pcpu_ptr() triggers warnings like
the following.

 drivers/net/loopback.c: In function 'loopback_get_stats':
 drivers/net/loopback.c:109: warning: initialization discards qualifiers from pointer target type

Fix it by adding const to the verification target pointer used in
__verify_pcpu_ptr().

Signed-off-by: Tejun Heo <tj@xxxxxxxxxx>
Reported-by: Stephen Rothwell <sfr@xxxxxxxxxxxxxxxx>
---
Sorry about the delay.  Patch committed to percpu#for-next.

Thanks.

 include/linux/percpu-defs.h |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/include/linux/percpu-defs.h b/include/linux/percpu-defs.h
index 1fa36eb..68567c0 100644
--- a/include/linux/percpu-defs.h
+++ b/include/linux/percpu-defs.h
@@ -24,7 +24,7 @@
  * input parameter is a percpu pointer.
  */
 #define __verify_pcpu_ptr(ptr)	do {					\
-	void __percpu *__vpp_verify = (typeof(ptr))NULL;		\
+	const void __percpu *__vpp_verify = (typeof(ptr))NULL;		\
 	(void)__vpp_verify;						\
 } while (0)

-- 
1.6.4.2

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