include/stddef.h: Move offsetofend() from vfio.h to a generic kernel header

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>
[bwh: Backported to 3.2:
 - There is no definition in vfio.h to move
 - Put the definition inside the #ifdef __KERNEL__ section]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>

diff --git a/include/linux/stddef.h b/include/linux/stddef.h
index 6a40c76..ff9bbb6 100644 (file)
--- a/include/linux/stddef.h
+++ b/include/linux/stddef.h
@@ -23,6 +23,16 @@ enum {
 #else
 #define offsetof(TYPE, MEMBER) ((size_t) &((TYPE *)0)->MEMBER)
 #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))
+
 #endif /* __KERNEL__ */
 
 #endif