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[RBTREE] Add accessor macros for colour and parent fields of rb_node 

This is in preparation for merging those fields into a single
'unsigned long', because using a whole machine-word for a single bit
of colour information is wasteful.

Signed-off-by: David Woodhouse <dwmw2@infradead.org>
hifive-unleashed-5.1
David Woodhouse 2006-04-21 13:12:44 +01:00
parent f4ffaa452e
commit 7fe1e133bf
1 changed files with 9 additions and 0 deletions
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9
include/linux/rbtree.h
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@ -107,6 +107,15 @@ struct rb_node
struct rb_node *rb_left;
};
#define rb_parent(r) ((r)->rb_parent)
#define rb_set_parent(r,p) do { (r)->rb_parent = p; } while (0)
#define rb_colour(r) ((r)->rb_colour)
#define rb_is_red(r) ((r)->colour == RB_RED)
#define rb_is_black(r) ((r)->colour == RB_BLACK)
#define rb_set_red(r) do { (r)->colour = RB_RED; } while (0)
#define rb_set_black(r) do { (r)->colour = RB_BLACK; } while (0)
#define rb_set_colour(r,c) do { (r)->colour = (c); } while (0)
struct rb_root
{
struct rb_node *rb_node;