mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-13 10:16:40 +07:00
10fd48f237
The conditions got reserved. Also make rb_next() and rb_prev() check for the empty condition. Signed-off-by: Jens Axboe <axboe@suse.de>
398 lines
8.6 KiB
C
398 lines
8.6 KiB
C
/*
|
|
Red Black Trees
|
|
(C) 1999 Andrea Arcangeli <andrea@suse.de>
|
|
(C) 2002 David Woodhouse <dwmw2@infradead.org>
|
|
|
|
This program is free software; you can redistribute it and/or modify
|
|
it under the terms of the GNU General Public License as published by
|
|
the Free Software Foundation; either version 2 of the License, or
|
|
(at your option) any later version.
|
|
|
|
This program is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
GNU General Public License for more details.
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
along with this program; if not, write to the Free Software
|
|
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
|
|
|
linux/lib/rbtree.c
|
|
*/
|
|
|
|
#include <linux/rbtree.h>
|
|
#include <linux/module.h>
|
|
|
|
static void __rb_rotate_left(struct rb_node *node, struct rb_root *root)
|
|
{
|
|
struct rb_node *right = node->rb_right;
|
|
struct rb_node *parent = rb_parent(node);
|
|
|
|
if ((node->rb_right = right->rb_left))
|
|
rb_set_parent(right->rb_left, node);
|
|
right->rb_left = node;
|
|
|
|
rb_set_parent(right, parent);
|
|
|
|
if (parent)
|
|
{
|
|
if (node == parent->rb_left)
|
|
parent->rb_left = right;
|
|
else
|
|
parent->rb_right = right;
|
|
}
|
|
else
|
|
root->rb_node = right;
|
|
rb_set_parent(node, right);
|
|
}
|
|
|
|
static void __rb_rotate_right(struct rb_node *node, struct rb_root *root)
|
|
{
|
|
struct rb_node *left = node->rb_left;
|
|
struct rb_node *parent = rb_parent(node);
|
|
|
|
if ((node->rb_left = left->rb_right))
|
|
rb_set_parent(left->rb_right, node);
|
|
left->rb_right = node;
|
|
|
|
rb_set_parent(left, parent);
|
|
|
|
if (parent)
|
|
{
|
|
if (node == parent->rb_right)
|
|
parent->rb_right = left;
|
|
else
|
|
parent->rb_left = left;
|
|
}
|
|
else
|
|
root->rb_node = left;
|
|
rb_set_parent(node, left);
|
|
}
|
|
|
|
void rb_insert_color(struct rb_node *node, struct rb_root *root)
|
|
{
|
|
struct rb_node *parent, *gparent;
|
|
|
|
while ((parent = rb_parent(node)) && rb_is_red(parent))
|
|
{
|
|
gparent = rb_parent(parent);
|
|
|
|
if (parent == gparent->rb_left)
|
|
{
|
|
{
|
|
register struct rb_node *uncle = gparent->rb_right;
|
|
if (uncle && rb_is_red(uncle))
|
|
{
|
|
rb_set_black(uncle);
|
|
rb_set_black(parent);
|
|
rb_set_red(gparent);
|
|
node = gparent;
|
|
continue;
|
|
}
|
|
}
|
|
|
|
if (parent->rb_right == node)
|
|
{
|
|
register struct rb_node *tmp;
|
|
__rb_rotate_left(parent, root);
|
|
tmp = parent;
|
|
parent = node;
|
|
node = tmp;
|
|
}
|
|
|
|
rb_set_black(parent);
|
|
rb_set_red(gparent);
|
|
__rb_rotate_right(gparent, root);
|
|
} else {
|
|
{
|
|
register struct rb_node *uncle = gparent->rb_left;
|
|
if (uncle && rb_is_red(uncle))
|
|
{
|
|
rb_set_black(uncle);
|
|
rb_set_black(parent);
|
|
rb_set_red(gparent);
|
|
node = gparent;
|
|
continue;
|
|
}
|
|
}
|
|
|
|
if (parent->rb_left == node)
|
|
{
|
|
register struct rb_node *tmp;
|
|
__rb_rotate_right(parent, root);
|
|
tmp = parent;
|
|
parent = node;
|
|
node = tmp;
|
|
}
|
|
|
|
rb_set_black(parent);
|
|
rb_set_red(gparent);
|
|
__rb_rotate_left(gparent, root);
|
|
}
|
|
}
|
|
|
|
rb_set_black(root->rb_node);
|
|
}
|
|
EXPORT_SYMBOL(rb_insert_color);
|
|
|
|
static void __rb_erase_color(struct rb_node *node, struct rb_node *parent,
|
|
struct rb_root *root)
|
|
{
|
|
struct rb_node *other;
|
|
|
|
while ((!node || rb_is_black(node)) && node != root->rb_node)
|
|
{
|
|
if (parent->rb_left == node)
|
|
{
|
|
other = parent->rb_right;
|
|
if (rb_is_red(other))
|
|
{
|
|
rb_set_black(other);
|
|
rb_set_red(parent);
|
|
__rb_rotate_left(parent, root);
|
|
other = parent->rb_right;
|
|
}
|
|
if ((!other->rb_left || rb_is_black(other->rb_left)) &&
|
|
(!other->rb_right || rb_is_black(other->rb_right)))
|
|
{
|
|
rb_set_red(other);
|
|
node = parent;
|
|
parent = rb_parent(node);
|
|
}
|
|
else
|
|
{
|
|
if (!other->rb_right || rb_is_black(other->rb_right))
|
|
{
|
|
struct rb_node *o_left;
|
|
if ((o_left = other->rb_left))
|
|
rb_set_black(o_left);
|
|
rb_set_red(other);
|
|
__rb_rotate_right(other, root);
|
|
other = parent->rb_right;
|
|
}
|
|
rb_set_color(other, rb_color(parent));
|
|
rb_set_black(parent);
|
|
if (other->rb_right)
|
|
rb_set_black(other->rb_right);
|
|
__rb_rotate_left(parent, root);
|
|
node = root->rb_node;
|
|
break;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
other = parent->rb_left;
|
|
if (rb_is_red(other))
|
|
{
|
|
rb_set_black(other);
|
|
rb_set_red(parent);
|
|
__rb_rotate_right(parent, root);
|
|
other = parent->rb_left;
|
|
}
|
|
if ((!other->rb_left || rb_is_black(other->rb_left)) &&
|
|
(!other->rb_right || rb_is_black(other->rb_right)))
|
|
{
|
|
rb_set_red(other);
|
|
node = parent;
|
|
parent = rb_parent(node);
|
|
}
|
|
else
|
|
{
|
|
if (!other->rb_left || rb_is_black(other->rb_left))
|
|
{
|
|
register struct rb_node *o_right;
|
|
if ((o_right = other->rb_right))
|
|
rb_set_black(o_right);
|
|
rb_set_red(other);
|
|
__rb_rotate_left(other, root);
|
|
other = parent->rb_left;
|
|
}
|
|
rb_set_color(other, rb_color(parent));
|
|
rb_set_black(parent);
|
|
if (other->rb_left)
|
|
rb_set_black(other->rb_left);
|
|
__rb_rotate_right(parent, root);
|
|
node = root->rb_node;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
if (node)
|
|
rb_set_black(node);
|
|
}
|
|
|
|
void rb_erase(struct rb_node *node, struct rb_root *root)
|
|
{
|
|
struct rb_node *child, *parent;
|
|
int color;
|
|
|
|
if (!node->rb_left)
|
|
child = node->rb_right;
|
|
else if (!node->rb_right)
|
|
child = node->rb_left;
|
|
else
|
|
{
|
|
struct rb_node *old = node, *left;
|
|
|
|
node = node->rb_right;
|
|
while ((left = node->rb_left) != NULL)
|
|
node = left;
|
|
child = node->rb_right;
|
|
parent = rb_parent(node);
|
|
color = rb_color(node);
|
|
|
|
if (child)
|
|
rb_set_parent(child, parent);
|
|
if (parent == old) {
|
|
parent->rb_right = child;
|
|
parent = node;
|
|
} else
|
|
parent->rb_left = child;
|
|
|
|
node->rb_parent_color = old->rb_parent_color;
|
|
node->rb_right = old->rb_right;
|
|
node->rb_left = old->rb_left;
|
|
|
|
if (rb_parent(old))
|
|
{
|
|
if (rb_parent(old)->rb_left == old)
|
|
rb_parent(old)->rb_left = node;
|
|
else
|
|
rb_parent(old)->rb_right = node;
|
|
} else
|
|
root->rb_node = node;
|
|
|
|
rb_set_parent(old->rb_left, node);
|
|
if (old->rb_right)
|
|
rb_set_parent(old->rb_right, node);
|
|
goto color;
|
|
}
|
|
|
|
parent = rb_parent(node);
|
|
color = rb_color(node);
|
|
|
|
if (child)
|
|
rb_set_parent(child, parent);
|
|
if (parent)
|
|
{
|
|
if (parent->rb_left == node)
|
|
parent->rb_left = child;
|
|
else
|
|
parent->rb_right = child;
|
|
}
|
|
else
|
|
root->rb_node = child;
|
|
|
|
color:
|
|
if (color == RB_BLACK)
|
|
__rb_erase_color(child, parent, root);
|
|
}
|
|
EXPORT_SYMBOL(rb_erase);
|
|
|
|
/*
|
|
* This function returns the first node (in sort order) of the tree.
|
|
*/
|
|
struct rb_node *rb_first(struct rb_root *root)
|
|
{
|
|
struct rb_node *n;
|
|
|
|
n = root->rb_node;
|
|
if (!n)
|
|
return NULL;
|
|
while (n->rb_left)
|
|
n = n->rb_left;
|
|
return n;
|
|
}
|
|
EXPORT_SYMBOL(rb_first);
|
|
|
|
struct rb_node *rb_last(struct rb_root *root)
|
|
{
|
|
struct rb_node *n;
|
|
|
|
n = root->rb_node;
|
|
if (!n)
|
|
return NULL;
|
|
while (n->rb_right)
|
|
n = n->rb_right;
|
|
return n;
|
|
}
|
|
EXPORT_SYMBOL(rb_last);
|
|
|
|
struct rb_node *rb_next(struct rb_node *node)
|
|
{
|
|
struct rb_node *parent;
|
|
|
|
if (rb_parent(node) == node)
|
|
return NULL;
|
|
|
|
/* If we have a right-hand child, go down and then left as far
|
|
as we can. */
|
|
if (node->rb_right) {
|
|
node = node->rb_right;
|
|
while (node->rb_left)
|
|
node=node->rb_left;
|
|
return node;
|
|
}
|
|
|
|
/* No right-hand children. Everything down and left is
|
|
smaller than us, so any 'next' node must be in the general
|
|
direction of our parent. Go up the tree; any time the
|
|
ancestor is a right-hand child of its parent, keep going
|
|
up. First time it's a left-hand child of its parent, said
|
|
parent is our 'next' node. */
|
|
while ((parent = rb_parent(node)) && node == parent->rb_right)
|
|
node = parent;
|
|
|
|
return parent;
|
|
}
|
|
EXPORT_SYMBOL(rb_next);
|
|
|
|
struct rb_node *rb_prev(struct rb_node *node)
|
|
{
|
|
struct rb_node *parent;
|
|
|
|
if (rb_parent(node) == node)
|
|
return NULL;
|
|
|
|
/* If we have a left-hand child, go down and then right as far
|
|
as we can. */
|
|
if (node->rb_left) {
|
|
node = node->rb_left;
|
|
while (node->rb_right)
|
|
node=node->rb_right;
|
|
return node;
|
|
}
|
|
|
|
/* No left-hand children. Go up till we find an ancestor which
|
|
is a right-hand child of its parent */
|
|
while ((parent = rb_parent(node)) && node == parent->rb_left)
|
|
node = parent;
|
|
|
|
return parent;
|
|
}
|
|
EXPORT_SYMBOL(rb_prev);
|
|
|
|
void rb_replace_node(struct rb_node *victim, struct rb_node *new,
|
|
struct rb_root *root)
|
|
{
|
|
struct rb_node *parent = rb_parent(victim);
|
|
|
|
/* Set the surrounding nodes to point to the replacement */
|
|
if (parent) {
|
|
if (victim == parent->rb_left)
|
|
parent->rb_left = new;
|
|
else
|
|
parent->rb_right = new;
|
|
} else {
|
|
root->rb_node = new;
|
|
}
|
|
if (victim->rb_left)
|
|
rb_set_parent(victim->rb_left, new);
|
|
if (victim->rb_right)
|
|
rb_set_parent(victim->rb_right, new);
|
|
|
|
/* Copy the pointers/colour from the victim to the replacement */
|
|
*new = *victim;
|
|
}
|
|
EXPORT_SYMBOL(rb_replace_node);
|