[patch 1/1] use offsetof for rb_entry

[blaisorblade_spam]

Use, in the rb_entry definition, the offsetof macro instead of reinventing the
wheel.

Signed-off-by: Paolo 'Blaisorblade' Giarrusso <blaisorblade_spam@xxxxxxxx>
---

 linux-2.6.9-current-paolo/include/linux/rbtree.h |    2 +-
 1 files changed, 1 insertion(+), 1 deletion(-)

diff -puN include/linux/rbtree.h~use-offsetof-rb_entry include/linux/rbtree.h
--- linux-2.6.9-current/include/linux/rbtree.h~use-offsetof-rb_entry	2004-10-07 16:11:27.590555976 +0200
+++ linux-2.6.9-current-paolo/include/linux/rbtree.h	2004-10-07 16:11:27.592555672 +0200
@@ -114,7 +114,7 @@ struct rb_root
 
 #define RB_ROOT	(struct rb_root) { NULL, }
 #define	rb_entry(ptr, type, member)					\
-	((type *)((char *)(ptr)-(unsigned long)(&((type *)0)->member)))
+	((type *)((char *)(ptr) - offsetof(type, member)))
 
 extern void rb_insert_color(struct rb_node *, struct rb_root *);
 extern void rb_erase(struct rb_node *, struct rb_root *);
_
-
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