[PATCH] can.h: make padding given by gcc explicit

[Shawn Landden <shawn@churchofgit.com>]

The current definition of struct can_frame has a 16-byte size, with 8-byte
alignment, but the 3 bytes of padding are not explicit like the similar 2 bytes
of padding of struct canfd_frame. Make it explicit so it is easier to read.

Signed-off-by: Shawn Landden <shawn@churchofgit.com>
---
 include/uapi/linux/can.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/include/uapi/linux/can.h b/include/uapi/linux/can.h
index 41892f7..bc1b937 100644
--- a/include/uapi/linux/can.h
+++ b/include/uapi/linux/can.h
@@ -100,6 +100,7 @@ typedef __u32 can_err_mask_t;
 struct can_frame {
 	canid_t can_id;  /* 32 bit CAN_ID + EFF/RTR/ERR flags */
 	__u8    can_dlc; /* frame payload length in byte (0 .. CAN_MAX_DLEN) */
+        __u8    __res[3];/* reserved / padding */
 	__u8    data[CAN_MAX_DLEN] __attribute__((aligned(8)));
 };
 
-- 
2.2.1.209.g41e5f3a