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authorChristoph Lameter <cl@linux.com>2013-08-23 23:01:58 +0400
committerTejun Heo <tj@kernel.org>2013-08-24 00:08:27 +0400
commitabec1a806e0c3cf168999667d5fb6218398ef12a (patch)
tree167e441fc26b6b404366d0310e41e32f52869ec6 /include/linux/percpu-defs.h
parenta4244454df1296e90cc961c1b636b1176ef0d9a0 (diff)
downloadlinux-abec1a806e0c3cf168999667d5fb6218398ef12a.tar.xz
percpu: Make __verify_pcu_ptr handle per cpu pointers to arrays
__verify_pcpu_ptr() will cause a compilation failure if the type of the pointer is a pointer to a fixed array of objects. Adding zero to the pointer converts the type of pointer to that pointing to a single object of the array. Signed-off-by: Christoph Lameter <cl@linux.com> Signed-off-by: Tejun Heo <tj@kernel.org>
Diffstat (limited to 'include/linux/percpu-defs.h')
-rw-r--r--include/linux/percpu-defs.h5
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)