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rbtree: move some implementation details from rbtree.h to rbtree.c

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rbtree users must use the documented APIs to manipulate the tree
structure.  Low-level helpers to manipulate node colors and parenthood are
not part of that API, so move them to lib/rbtree.c

[dwmw2@infradead.org: fix jffs2 build issue due to renamed __rb_parent_color field]
Signed-off-by: Michel Lespinasse <walken@google.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Acked-by: David Woodhouse <David.Woodhouse@intel.com>
Cc: Rik van Riel <riel@redhat.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Daniel Santos <daniel.santos@pobox.com>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Michel Lespinasse 2012-10-08 16:30:37 -07:00 • committed by Linus Torvalds
parent ea5272f5c9
commit bf7ad8eeab
3 changed files with 36 additions and 31 deletions
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20
lib/rbtree.c
View file

@ -23,6 +23,24 @@
#include <linux/rbtree.h>
#include <linux/export.h>
#define RB_RED 0
#define RB_BLACK 1
#define rb_color(r) ((r)->__rb_parent_color & 1)
#define rb_is_red(r) (!rb_color(r))
#define rb_is_black(r) rb_color(r)
#define rb_set_red(r) do { (r)->__rb_parent_color &= ~1; } while (0)
#define rb_set_black(r) do { (r)->__rb_parent_color |= 1; } while (0)
static inline void rb_set_parent(struct rb_node *rb, struct rb_node *p)
{
rb->__rb_parent_color = rb_color(rb) | (unsigned long)p;
}
static inline void rb_set_color(struct rb_node *rb, int color)
{
rb->__rb_parent_color = (rb->__rb_parent_color & ~1) | color;
}
static void __rb_rotate_left(struct rb_node *node, struct rb_root *root)
{
struct rb_node *right = node->rb_right;
@ -255,7 +273,7 @@ void rb_erase(struct rb_node *node, struct rb_root *root)
rb_set_parent(old->rb_right, node);
}
node->rb_parent_color = old->rb_parent_color;
node->__rb_parent_color = old->__rb_parent_color;
node->rb_left = old->rb_left;
rb_set_parent(old->rb_left, node);