Author: dougm Date: Tue Jun 23 20:02:55 2020 New Revision: 362552 URL: https://svnweb.freebsd.org/changeset/base/362552
Log: Define RB_SET_PARENT to do all assignments to rb parent pointers. Define RB_SWAP_CHILD to replace the child of a parent with its twin, and use it in 4 places. Use RB_SET in rb_link_node to remove the only linuxkpi reference to color, and then drop color- and parent-related definitions that are defined and used only in rbtree.h. This is intended to be entirely cosmetic, with no impact on program behavior, and leave RB_PARENT and RB_SET_PARENT as the only ways to read and write rb parent pointers. Reviewed by: markj, kib Tested by: pho Differential Revision: https://reviews.freebsd.org/D25264 Modified: head/sys/compat/linuxkpi/common/include/linux/rbtree.h head/sys/sys/tree.h Modified: head/sys/compat/linuxkpi/common/include/linux/rbtree.h ============================================================================== --- head/sys/compat/linuxkpi/common/include/linux/rbtree.h Tue Jun 23 19:14:38 2020 (r362551) +++ head/sys/compat/linuxkpi/common/include/linux/rbtree.h Tue Jun 23 20:02:55 2020 (r362552) @@ -56,17 +56,11 @@ int panic_cmp(struct rb_node *one, struct rb_node *two RB_HEAD(linux_root, rb_node); RB_PROTOTYPE(linux_root, rb_node, __entry, panic_cmp); -#define rb_parent(r) RB_PARENT(r, __entry) -#define rb_color(r) RB_COLOR(r, __entry) -#define rb_is_red(r) (rb_color(r) == RB_RED) -#define rb_is_black(r) (rb_color(r) == RB_BLACK) -#define rb_set_parent(r, p) rb_parent((r)) = (p) -#define rb_set_color(r, c) rb_color((r)) = (c) #define rb_entry(ptr, type, member) container_of(ptr, type, member) #define RB_EMPTY_ROOT(root) RB_EMPTY((struct linux_root *)root) -#define RB_EMPTY_NODE(node) (rb_parent(node) == node) -#define RB_CLEAR_NODE(node) (rb_set_parent(node, node)) +#define RB_EMPTY_NODE(node) (RB_PARENT(node, __entry) == node) +#define RB_CLEAR_NODE(node) (RB_SET_PARENT(node, node, __entry)) #define rb_insert_color(node, root) \ linux_root_RB_INSERT_COLOR((struct linux_root *)(root), (node)) @@ -81,9 +75,7 @@ static inline void rb_link_node(struct rb_node *node, struct rb_node *parent, struct rb_node **rb_link) { - rb_set_parent(node, parent); - rb_set_color(node, RB_RED); - node->__entry.rbe_left = node->__entry.rbe_right = NULL; + RB_SET(node, parent, __entry); *rb_link = node; } @@ -91,20 +83,12 @@ static inline void rb_replace_node(struct rb_node *victim, struct rb_node *new, struct rb_root *root) { - struct rb_node *p; - p = rb_parent(victim); - if (p) { - if (p->rb_left == victim) - p->rb_left = new; - else - p->rb_right = new; - } else - root->rb_node = new; + RB_SWAP_CHILD((struct linux_root *)root, victim, new, __entry); if (victim->rb_left) - rb_set_parent(victim->rb_left, new); + RB_SET_PARENT(victim->rb_left, new, __entry); if (victim->rb_right) - rb_set_parent(victim->rb_right, new); + RB_SET_PARENT(victim->rb_right, new, __entry); *new = *victim; } Modified: head/sys/sys/tree.h ============================================================================== --- head/sys/sys/tree.h Tue Jun 23 19:14:38 2020 (r362551) +++ head/sys/sys/tree.h Tue Jun 23 20:02:55 2020 (r362552) @@ -325,8 +325,12 @@ struct { \ #define RB_ROOT(head) (head)->rbh_root #define RB_EMPTY(head) (RB_ROOT(head) == NULL) +#define RB_SET_PARENT(dst, src, field) do { \ + RB_PARENT(dst, field) = src; \ +} while (/*CONSTCOND*/ 0) + #define RB_SET(elm, parent, field) do { \ - RB_PARENT(elm, field) = parent; \ + RB_SET_PARENT(elm, parent, field); \ RB_LEFT(elm, field) = RB_RIGHT(elm, field) = NULL; \ RB_COLOR(elm, field) = RB_RED; \ } while (/*CONSTCOND*/ 0) @@ -344,37 +348,36 @@ struct { \ #define RB_AUGMENT(x) break #endif +#define RB_SWAP_CHILD(head, out, in, field) do { \ + if (RB_PARENT(out, field) == NULL) \ + RB_ROOT(head) = (in); \ + else if ((out) == RB_LEFT(RB_PARENT(out, field), field)) \ + RB_LEFT(RB_PARENT(out, field), field) = (in); \ + else \ + RB_RIGHT(RB_PARENT(out, field), field) = (in); \ +} while (/*CONSTCOND*/ 0) + #define RB_ROTATE_LEFT(head, elm, tmp, field) do { \ (tmp) = RB_RIGHT(elm, field); \ if ((RB_RIGHT(elm, field) = RB_LEFT(tmp, field)) != NULL) { \ - RB_PARENT(RB_LEFT(tmp, field), field) = (elm); \ + RB_SET_PARENT(RB_RIGHT(elm, field), elm, field); \ } \ - if ((RB_PARENT(tmp, field) = RB_PARENT(elm, field)) != NULL) { \ - if ((elm) == RB_LEFT(RB_PARENT(elm, field), field)) \ - RB_LEFT(RB_PARENT(elm, field), field) = (tmp); \ - else \ - RB_RIGHT(RB_PARENT(elm, field), field) = (tmp); \ - } else \ - (head)->rbh_root = (tmp); \ + RB_SET_PARENT(tmp, RB_PARENT(elm, field), field); \ + RB_SWAP_CHILD(head, elm, tmp, field); \ RB_LEFT(tmp, field) = (elm); \ - RB_PARENT(elm, field) = (tmp); \ + RB_SET_PARENT(elm, tmp, field); \ RB_AUGMENT(elm); \ } while (/*CONSTCOND*/ 0) #define RB_ROTATE_RIGHT(head, elm, tmp, field) do { \ (tmp) = RB_LEFT(elm, field); \ if ((RB_LEFT(elm, field) = RB_RIGHT(tmp, field)) != NULL) { \ - RB_PARENT(RB_RIGHT(tmp, field), field) = (elm); \ + RB_SET_PARENT(RB_LEFT(elm, field), elm, field); \ } \ - if ((RB_PARENT(tmp, field) = RB_PARENT(elm, field)) != NULL) { \ - if ((elm) == RB_LEFT(RB_PARENT(elm, field), field)) \ - RB_LEFT(RB_PARENT(elm, field), field) = (tmp); \ - else \ - RB_RIGHT(RB_PARENT(elm, field), field) = (tmp); \ - } else \ - (head)->rbh_root = (tmp); \ + RB_SET_PARENT(tmp, RB_PARENT(elm, field), field); \ + RB_SWAP_CHILD(head, elm, tmp, field); \ RB_RIGHT(tmp, field) = (elm); \ - RB_PARENT(elm, field) = (tmp); \ + RB_SET_PARENT(elm, tmp, field); \ RB_AUGMENT(elm); \ } while (/*CONSTCOND*/ 0) @@ -545,11 +548,11 @@ name##_RB_REMOVE_COLOR(struct name *head, struct type attr struct type * \ name##_RB_REMOVE(struct name *head, struct type *elm) \ { \ - struct type *child, *old, *parent, *parent_old, *right; \ + struct type *child, *old, *parent, *right; \ int color; \ \ old = elm; \ - parent_old = parent = RB_PARENT(elm, field); \ + parent = RB_PARENT(elm, field); \ right = RB_RIGHT(elm, field); \ color = RB_COLOR(elm, field); \ if (RB_LEFT(elm, field) == NULL) \ @@ -568,20 +571,15 @@ name##_RB_REMOVE(struct name *head, struct type *elm) child = RB_RIGHT(elm, field); \ parent = RB_PARENT(elm, field); \ RB_LEFT(parent, field) = child; \ - RB_PARENT(RB_RIGHT(old, field), field) = elm; \ + RB_SET_PARENT(RB_RIGHT(old, field), elm, field); \ } \ - RB_PARENT(RB_LEFT(old, field), field) = elm; \ + RB_SET_PARENT(RB_LEFT(old, field), elm, field); \ color = RB_COLOR(elm, field); \ elm->field = old->field; \ } \ - if (parent_old == NULL) \ - RB_ROOT(head) = elm; \ - else if (RB_LEFT(parent_old, field) == old) \ - RB_LEFT(parent_old, field) = elm; \ - else \ - RB_RIGHT(parent_old, field) = elm; \ + RB_SWAP_CHILD(head, old, elm, field); \ if (child != NULL) { \ - RB_PARENT(child, field) = parent; \ + RB_SET_PARENT(child, parent, field); \ RB_COLOR(child, field) = RB_BLACK; \ } else if (color != RB_RED && parent != NULL) \ name##_RB_REMOVE_COLOR(head, parent); \ _______________________________________________ svn-src-head@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/svn-src-head To unsubscribe, send any mail to "svn-src-head-unsubscr...@freebsd.org"
