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Commit abec1a80 authored by Christoph Lameter's avatar Christoph Lameter Committed by Tejun Heo
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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: default avatarChristoph Lameter <cl@linux.com>
Signed-off-by: default avatarTejun Heo <tj@kernel.org>
parent a4244454

include/linux/percpu-defs.h

+4 −1
Original line number Diff line number Diff line
@@ -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)