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authorArtem Bityutskiy <Artem.Bityutskiy@nokia.com>2009-01-10 14:12:09 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2009-01-10 17:04:33 +0300
commitf4b477c47332367d35686bd2b808c2156b96d7c7 (patch)
treeab8a2cf098b69be9ed7a44426106a7af596241d9 /include/linux
parentcfce41a6d643c001d416ead960caf04fae2d609a (diff)
downloadlinux-f4b477c47332367d35686bd2b808c2156b96d7c7.tar.xz
rbtree: add const qualifier to some functions
The 'rb_first()', 'rb_last()', 'rb_next()' and 'rb_prev()' calls take a pointer to an RB node or RB root. They do not change the pointed objects, so add a 'const' qualifier in order to make life of the users of these functions easier. Indeed, if I have my own constant pointer &const struct my_type *p, and I call 'rb_next(&p->rb)', I get a GCC warning: warning: passing argument 1 of ‘rb_next’ discards qualifiers from pointer target type Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com> Signed-off-by: David Woodhouse <David.Woodhouse@intel.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/linux')
-rw-r--r--include/linux/rbtree.h8
1 files changed, 4 insertions, 4 deletions
diff --git a/include/linux/rbtree.h b/include/linux/rbtree.h
index 344bc3495ddb..9c295411d01f 100644
--- a/include/linux/rbtree.h
+++ b/include/linux/rbtree.h
@@ -140,10 +140,10 @@ extern void rb_insert_color(struct rb_node *, struct rb_root *);
extern void rb_erase(struct rb_node *, struct rb_root *);
/* Find logical next and previous nodes in a tree */
-extern struct rb_node *rb_next(struct rb_node *);
-extern struct rb_node *rb_prev(struct rb_node *);
-extern struct rb_node *rb_first(struct rb_root *);
-extern struct rb_node *rb_last(struct rb_root *);
+extern struct rb_node *rb_next(const struct rb_node *);
+extern struct rb_node *rb_prev(const struct rb_node *);
+extern struct rb_node *rb_first(const struct rb_root *);
+extern struct rb_node *rb_last(const struct rb_root *);
/* Fast replacement of a single node without remove/rebalance/add/rebalance */
extern void rb_replace_node(struct rb_node *victim, struct rb_node *new,