[PATCH] [v2] alloc_tag: avoid implicit padding in uapi

[Arnd Bergmann]

From: Arnd Bergmann <arnd@xxxxxxxx>

The implied padding causes a harmless warning when testing the uapi
headers with -Wpadded that could in theory indicate incompatibilities
or data leaks:

./usr/include/linux/alloc_tag.h:41:1: error: padding struct size to alignment boundary with 7 bytes [-Werror=padded]

The code here is fine, but it's better to make the padding explicit
and avoid the warning here.

Acked-by: SJ Park <sj@xxxxxxxxxx>
Acked-by: Hao Ge <hao.ge@xxxxxxxxx>
Fixes: 1d581ab2348c ("alloc_tag: add ioctl to /proc/allocinfo")
Signed-off-by: Arnd Bergmann <arnd@xxxxxxxx>
---
v2; fix changelog typos
---
 include/uapi/linux/alloc_tag.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/include/uapi/linux/alloc_tag.h b/include/uapi/linux/alloc_tag.h
index e3ad94444864..7d4618bea043 100644
--- a/include/uapi/linux/alloc_tag.h
+++ b/include/uapi/linux/alloc_tag.h
@@ -38,6 +38,7 @@ struct allocinfo_counter {
 	__u64 bytes;
 	__u64 calls;
 	__u8 accurate;
+	__u8 pad[7];
 } __attribute__((aligned(8)));
 
 struct allocinfo_tag_data {
-- 
2.53.0