linux-kernel - [RFC PATCH 01/16] typecheck_member and offsetof

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Date:	Tue, 21 Jul 2015 15:50:43 +0200
From:	Tomeu Vizoso <tomeu.vizoso@...labora.com>
To:	linux-kernel@...r.kernel.org
Cc:	Stephen Warren <swarren@...dotorg.org>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	linux-arm-kernel@...ts.infradead.org,
	Arnd Bergmann <arnd@...db.de>, Mark Brown <broonie@...nel.org>,
	Tomeu Vizoso <tomeu.vizoso@...labora.com>
Subject: [RFC PATCH 01/16] typecheck_member and offsetof_t

Signed-off-by: Tomeu Vizoso <tomeu.vizoso@...labora.com>
---

 include/linux/stddef.h | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/include/linux/stddef.h b/include/linux/stddef.h
index 9c61c7cda936..e60bd164c03a 100644
--- a/include/linux/stddef.h
+++ b/include/linux/stddef.h
@@ -27,4 +27,11 @@ enum {
 #define offsetofend(TYPE, MEMBER) \
 	(offsetof(TYPE, MEMBER)	+ sizeof(((TYPE *)0)->MEMBER))
 
+#define typecheck_member(TYPE, MEMBER, MEMBERTYPE) \
+	((size_t)(&((TYPE *)0)->MEMBER - (MEMBERTYPE*)0) ? 0 : 0)
+
+/* like offsetof(), but ensures that MEMBER is of type MEMBERTYPE */
+#define offsetof_t(TYPE, MEMBER, MEMBERTYPE) \
+	(typecheck_member(TYPE, MEMBER, MEMBERTYPE) + offsetof(TYPE, MEMBER))
+
 #endif
-- 
2.4.3

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