Merge branch 'for-3.12' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/percpu

Pull single percpu update from Tejun Heo:
 "Just a single patch to update type verification macro for percpu
  accessors.

  Christoph is trying to replace __get_cpu_var() with this_cpu accessors
  which needs this update.  There are still some issues to be resolved
  but eventually the conversion patches are likely to be routed through
  different trees, so I think it'd be convenient to merge this commit
  early"

* 'for-3.12' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/percpu:
  percpu: Make __verify_pcu_ptr handle per cpu pointers to arrays

1 files changed, 4 insertions, 1 deletions

diff --git a/include/linux/percpu-defs.h b/include/linux/percpu-defs.h
index 27ef6b190ea6..57e890abe1f0 100644
--- a/include/linux/percpu-defs.h
+++ b/include/linux/percpu-defs.h
@@ -22,9 +22,12 @@
  * Macro which verifies @ptr is a percpu pointer without evaluating
  * @ptr.  This is to be used in percpu accessors to verify that the
  * input parameter is a percpu pointer.
+ *
+ * + 0 is required in order to convert the pointer type from a
+ * potential array type to a pointer to a single item of the array.
  */
 #define __verify_pcpu_ptr(ptr)  do {                                    \
-        const void __percpu *__vpp_verify = (typeof(ptr))NULL;          \
+        const void __percpu *__vpp_verify = (typeof((ptr) + 0))NULL;    \
         (void)__vpp_verify;                                             \
 } while (0)