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authorHarshitha Ramamurthy <harshitha.ramamurthy@intel.com>2018-01-23 19:51:03 +0300
committerJeff Kirsher <jeffrey.t.kirsher@intel.com>2018-02-14 20:43:22 +0300
commit0718e560a330599d15fddc37651d693c7a09e49e (patch)
tree7479205c930d75a9ba84a70f5ba7201a8788abd3 /include/linux/avf
parent0c483bd4b82619397e7f655eea1ba3ba9d9a15a2 (diff)
downloadlinux-0718e560a330599d15fddc37651d693c7a09e49e.tar.xz
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: Harshitha Ramamurthy <harshitha.ramamurthy@intel.com> Tested-by: Andrew Bowers <andrewx.bowers@intel.com> Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Diffstat (limited to 'include/linux/avf')
-rw-r--r--include/linux/avf/virtchnl.h8
1 files changed, 5 insertions, 3 deletions
diff --git a/include/linux/avf/virtchnl.h b/include/linux/avf/virtchnl.h
index 1f652ceecf35..6fe630ebbf23 100644
--- a/include/linux/avf/virtchnl.h
+++ b/include/linux/avf/virtchnl.h
@@ -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.