[PATCH 3.16 148/254] include/stddef.h: Move offsetofend() from vfio.h to a generic kernel header

Ben Hutchings
2018-02-28T16:16:13Z

From: Denys Vlasenko <dvlasenk@redhat.com>

commit 3876488444e71238e287459c39d7692b6f718c3e upstream.

Suggested by Andy.

Suggested-by: Andy Lutomirski <luto@amacapital.net>
Signed-off-by: Denys Vlasenko <dvlasenk@redhat.com>
Acked-by: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Alexei Starovoitov <ast@plumgrid.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Will Drewry <wad@chromium.org>
Link: http://lkml.kernel.org/r/1425912738-559-1-git-send-email-dvlasenk@redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---
include/linux/stddef.h | 9 +++++++++
include/linux/vfio.h | 13 -------------
2 files changed, 9 insertions(+), 13 deletions(-)

--- a/include/linux/stddef.h
+++ b/include/linux/stddef.h
@@ -19,3 +19,12 @@ enum {
#define offsetof(TYPE, MEMBER) ((size_t) &((TYPE *)0)->MEMBER)
#endif
#endif
+
+/**
+ * offsetofend(TYPE, MEMBER)
+ *
+ * @TYPE: The type of the structure
+ * @MEMBER: The member within the structure to get the end offset of
+ */
+#define offsetofend(TYPE, MEMBER) \
+ (offsetof(TYPE, MEMBER) + sizeof(((TYPE *)0)->MEMBER))
--- a/include/linux/vfio.h
+++ b/include/linux/vfio.h
@@ -76,19 +76,6 @@ extern int vfio_register_iommu_driver(co
extern void vfio_unregister_iommu_driver(
const struct vfio_iommu_driver_ops *ops);

-/**
- * offsetofend(TYPE, MEMBER)
- *
- * @TYPE: The type of the structure
- * @MEMBER: The member within the structure to get the end offset of
- *
- * Simple helper macro for dealing with variable sized structures passed
- * from user space. This allows us to easily determine if the provided
- * structure is sized to include various fields.
- */
-#define offsetofend(TYPE, MEMBER) \
- (offsetof(TYPE, MEMBER) + sizeof(((TYPE *)0)->MEMBER))
-
/*
* External user API
*/