linux-kernel - [PATCH 3.10 217/319] include/stddef.h: Move offsetofend() from vfio.h to a generic kernel header

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Message-Id: <1486322541-8206-118-git-send-email-w@1wt.eu>
Date:   Sun,  5 Feb 2017 20:20:39 +0100
From:   Willy Tarreau <w@....eu>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        linux@...ck-us.net
Cc:     Denys Vlasenko <dvlasenk@...hat.com>,
        Alexei Starovoitov <ast@...mgrid.com>,
        Borislav Petkov <bp@...en8.de>,
        Frederic Weisbecker <fweisbec@...il.com>,
        "H . Peter Anvin" <hpa@...or.com>,
        Kees Cook <keescook@...omium.org>,
        Oleg Nesterov <oleg@...hat.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Will Drewry <wad@...omium.org>, Ingo Molnar <mingo@...nel.org>,
        Willy Tarreau <w@....eu>
Subject: [PATCH 3.10 217/319] include/stddef.h: Move offsetofend() from vfio.h to a generic kernel header

From: Denys Vlasenko <dvlasenk@...hat.com>

commit 3876488444e71238e287459c39d7692b6f718c3e upstream.

Suggested by Andy.

Suggested-by: Andy Lutomirski <luto@...capital.net>
Signed-off-by: Denys Vlasenko <dvlasenk@...hat.com>
Acked-by: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Alexei Starovoitov <ast@...mgrid.com>
Cc: Borislav Petkov <bp@...en8.de>
Cc: Frederic Weisbecker <fweisbec@...il.com>
Cc: H. Peter Anvin <hpa@...or.com>
Cc: Kees Cook <keescook@...omium.org>
Cc: Oleg Nesterov <oleg@...hat.com>
Cc: Steven Rostedt <rostedt@...dmis.org>
Cc: Will Drewry <wad@...omium.org>
Link: http://lkml.kernel.org/r/1425912738-559-1-git-send-email-dvlasenk@redhat.com
Signed-off-by: Ingo Molnar <mingo@...nel.org>
[wt: backported only for ipv6 out-of-bounds fix]

Signed-off-by: Willy Tarreau <w@....eu>
---
 include/linux/stddef.h |  9 +++++++++
 include/linux/vfio.h   | 13 -------------
 2 files changed, 9 insertions(+), 13 deletions(-)

diff --git a/include/linux/stddef.h b/include/linux/stddef.h
index f4aec0e..076af43 100644
--- 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))
diff --git a/include/linux/vfio.h b/include/linux/vfio.h
index 1a7f0ac..ef4f737 100644
--- a/include/linux/vfio.h
+++ b/include/linux/vfio.h
@@ -76,17 +76,4 @@ extern int vfio_register_iommu_driver(const struct vfio_iommu_driver_ops *ops);
 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))
-
 #endif /* VFIO_H */
-- 
2.8.0.rc2.1.gbe9624a