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Commit 0718e560 authored by Harshitha Ramamurthy's avatar Harshitha Ramamurthy Committed by Jeff Kirsher
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virtchnl: Add a macro to check the size of a union 



This patch adds a macro to check if the size of a union is correct.
It throws a divide by zero error if the union is not of the correct
size.

Signed-off-by: default avatarHarshitha Ramamurthy <harshitha.ramamurthy@intel.com>
Tested-by: default avatarAndrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: default avatarJeff Kirsher <jeffrey.t.kirsher@intel.com>
parent 0c483bd4

include/linux/avf/virtchnl.h

+5 −3
Original line number Diff line number Diff line
@@ -140,13 +140,15 @@ enum virtchnl_ops { 
	VIRTCHNL_OP_DISABLE_CHANNELS = 31,

};



/* This macro is used to generate a compilation error if a structure

/* These macros are used to generate compilation errors if a structure/union

 * is not exactly the correct length. It gives a divide by zero error if the

 * structure is not of the correct size, otherwise it creates an enum that is

 * never used.

 * structure/union is not of the correct size, otherwise it creates an enum

 * that is never used.

 */

#define VIRTCHNL_CHECK_STRUCT_LEN(n, X) enum virtchnl_static_assert_enum_##X \

	{ virtchnl_static_assert_##X = (n)/((sizeof(struct X) == (n)) ? 1 : 0) }

#define VIRTCHNL_CHECK_UNION_LEN(n, X) enum virtchnl_static_asset_enum_##X \

	{ virtchnl_static_assert_##X = (n)/((sizeof(union X) == (n)) ? 1 : 0) }



/* Virtual channel message descriptor. This overlays the admin queue

 * descriptor. All other data is passed in external buffers.