percpu: remove compile warnings caused by __verify_pcpu_ptr()

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@kernel.org>
Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>

1 files changed, 1 insertions, 1 deletions

diff --git a/include/linux/percpu-defs.h b/include/linux/percpu-defs.h
index 1fa36eb54b6a..68567c0b3a5d 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)