tools: Copy lib/rbtree.c to tools/lib/
authorArnaldo Carvalho de Melo <acme@redhat.com>
Mon, 6 Jul 2015 01:48:21 +0000 (22:48 -0300)
committerArnaldo Carvalho de Melo <acme@redhat.com>
Mon, 6 Jul 2015 01:48:21 +0000 (22:48 -0300)
So that we can remove kernel specific stuff we've been stubbing out via
a tools/include/linux/export.h that gets removed in this patch and to
avoid breakages in the future like the one fixed recently where
rcupdate.h started being used in rbtree.h.

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Borislav Petkov <bp@suse.de>
Cc: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/n/tip-rxuzfsozpb8hv1emwpx06rm6@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
tools/include/linux/export.h [deleted file]
tools/lib/rbtree.c [new file with mode: 0644]
tools/perf/MANIFEST
tools/perf/util/Build

diff --git a/tools/include/linux/export.h b/tools/include/linux/export.h
deleted file mode 100644 (file)
index d07e586..0000000
+++ /dev/null
@@ -1,10 +0,0 @@
-#ifndef _TOOLS_LINUX_EXPORT_H_
-#define _TOOLS_LINUX_EXPORT_H_
-
-#define EXPORT_SYMBOL(sym)
-#define EXPORT_SYMBOL_GPL(sym)
-#define EXPORT_SYMBOL_GPL_FUTURE(sym)
-#define EXPORT_UNUSED_SYMBOL(sym)
-#define EXPORT_UNUSED_SYMBOL_GPL(sym)
-
-#endif
diff --git a/tools/lib/rbtree.c b/tools/lib/rbtree.c
new file mode 100644 (file)
index 0000000..17c2b59
--- /dev/null
@@ -0,0 +1,548 @@
+/*
+  Red Black Trees
+  (C) 1999  Andrea Arcangeli <andrea@suse.de>
+  (C) 2002  David Woodhouse <dwmw2@infradead.org>
+  (C) 2012  Michel Lespinasse <walken@google.com>
+
+  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_augmented.h>
+
+/*
+ * red-black trees properties:  http://en.wikipedia.org/wiki/Rbtree
+ *
+ *  1) A node is either red or black
+ *  2) The root is black
+ *  3) All leaves (NULL) are black
+ *  4) Both children of every red node are black
+ *  5) Every simple path from root to leaves contains the same number
+ *     of black nodes.
+ *
+ *  4 and 5 give the O(log n) guarantee, since 4 implies you cannot have two
+ *  consecutive red nodes in a path and every red node is therefore followed by
+ *  a black. So if B is the number of black nodes on every simple path (as per
+ *  5), then the longest possible path due to 4 is 2B.
+ *
+ *  We shall indicate color with case, where black nodes are uppercase and red
+ *  nodes will be lowercase. Unknown color nodes shall be drawn as red within
+ *  parentheses and have some accompanying text comment.
+ */
+
+static inline void rb_set_black(struct rb_node *rb)
+{
+       rb->__rb_parent_color |= RB_BLACK;
+}
+
+static inline struct rb_node *rb_red_parent(struct rb_node *red)
+{
+       return (struct rb_node *)red->__rb_parent_color;
+}
+
+/*
+ * Helper function for rotations:
+ * - old's parent and color get assigned to new
+ * - old gets assigned new as a parent and 'color' as a color.
+ */
+static inline void
+__rb_rotate_set_parents(struct rb_node *old, struct rb_node *new,
+                       struct rb_root *root, int color)
+{
+       struct rb_node *parent = rb_parent(old);
+       new->__rb_parent_color = old->__rb_parent_color;
+       rb_set_parent_color(old, new, color);
+       __rb_change_child(old, new, parent, root);
+}
+
+static __always_inline void
+__rb_insert(struct rb_node *node, struct rb_root *root,
+           void (*augment_rotate)(struct rb_node *old, struct rb_node *new))
+{
+       struct rb_node *parent = rb_red_parent(node), *gparent, *tmp;
+
+       while (true) {
+               /*
+                * Loop invariant: node is red
+                *
+                * If there is a black parent, we are done.
+                * Otherwise, take some corrective action as we don't
+                * want a red root or two consecutive red nodes.
+                */
+               if (!parent) {
+                       rb_set_parent_color(node, NULL, RB_BLACK);
+                       break;
+               } else if (rb_is_black(parent))
+                       break;
+
+               gparent = rb_red_parent(parent);
+
+               tmp = gparent->rb_right;
+               if (parent != tmp) {    /* parent == gparent->rb_left */
+                       if (tmp && rb_is_red(tmp)) {
+                               /*
+                                * Case 1 - color flips
+                                *
+                                *       G            g
+                                *      / \          / \
+                                *     p   u  -->   P   U
+                                *    /            /
+                                *   n            n
+                                *
+                                * However, since g's parent might be red, and
+                                * 4) does not allow this, we need to recurse
+                                * at g.
+                                */
+                               rb_set_parent_color(tmp, gparent, RB_BLACK);
+                               rb_set_parent_color(parent, gparent, RB_BLACK);
+                               node = gparent;
+                               parent = rb_parent(node);
+                               rb_set_parent_color(node, parent, RB_RED);
+                               continue;
+                       }
+
+                       tmp = parent->rb_right;
+                       if (node == tmp) {
+                               /*
+                                * Case 2 - left rotate at parent
+                                *
+                                *      G             G
+                                *     / \           / \
+                                *    p   U  -->    n   U
+                                *     \           /
+                                *      n         p
+                                *
+                                * This still leaves us in violation of 4), the
+                                * continuation into Case 3 will fix that.
+                                */
+                               parent->rb_right = tmp = node->rb_left;
+                               node->rb_left = parent;
+                               if (tmp)
+                                       rb_set_parent_color(tmp, parent,
+                                                           RB_BLACK);
+                               rb_set_parent_color(parent, node, RB_RED);
+                               augment_rotate(parent, node);
+                               parent = node;
+                               tmp = node->rb_right;
+                       }
+
+                       /*
+                        * Case 3 - right rotate at gparent
+                        *
+                        *        G           P
+                        *       / \         / \
+                        *      p   U  -->  n   g
+                        *     /                 \
+                        *    n                   U
+                        */
+                       gparent->rb_left = tmp;  /* == parent->rb_right */
+                       parent->rb_right = gparent;
+                       if (tmp)
+                               rb_set_parent_color(tmp, gparent, RB_BLACK);
+                       __rb_rotate_set_parents(gparent, parent, root, RB_RED);
+                       augment_rotate(gparent, parent);
+                       break;
+               } else {
+                       tmp = gparent->rb_left;
+                       if (tmp && rb_is_red(tmp)) {
+                               /* Case 1 - color flips */
+                               rb_set_parent_color(tmp, gparent, RB_BLACK);
+                               rb_set_parent_color(parent, gparent, RB_BLACK);
+                               node = gparent;
+                               parent = rb_parent(node);
+                               rb_set_parent_color(node, parent, RB_RED);
+                               continue;
+                       }
+
+                       tmp = parent->rb_left;
+                       if (node == tmp) {
+                               /* Case 2 - right rotate at parent */
+                               parent->rb_left = tmp = node->rb_right;
+                               node->rb_right = parent;
+                               if (tmp)
+                                       rb_set_parent_color(tmp, parent,
+                                                           RB_BLACK);
+                               rb_set_parent_color(parent, node, RB_RED);
+                               augment_rotate(parent, node);
+                               parent = node;
+                               tmp = node->rb_left;
+                       }
+
+                       /* Case 3 - left rotate at gparent */
+                       gparent->rb_right = tmp;  /* == parent->rb_left */
+                       parent->rb_left = gparent;
+                       if (tmp)
+                               rb_set_parent_color(tmp, gparent, RB_BLACK);
+                       __rb_rotate_set_parents(gparent, parent, root, RB_RED);
+                       augment_rotate(gparent, parent);
+                       break;
+               }
+       }
+}
+
+/*
+ * Inline version for rb_erase() use - we want to be able to inline
+ * and eliminate the dummy_rotate callback there
+ */
+static __always_inline void
+____rb_erase_color(struct rb_node *parent, struct rb_root *root,
+       void (*augment_rotate)(struct rb_node *old, struct rb_node *new))
+{
+       struct rb_node *node = NULL, *sibling, *tmp1, *tmp2;
+
+       while (true) {
+               /*
+                * Loop invariants:
+                * - node is black (or NULL on first iteration)
+                * - node is not the root (parent is not NULL)
+                * - All leaf paths going through parent and node have a
+                *   black node count that is 1 lower than other leaf paths.
+                */
+               sibling = parent->rb_right;
+               if (node != sibling) {  /* node == parent->rb_left */
+                       if (rb_is_red(sibling)) {
+                               /*
+                                * Case 1 - left rotate at parent
+                                *
+                                *     P               S
+                                *    / \             / \
+                                *   N   s    -->    p   Sr
+                                *      / \         / \
+                                *     Sl  Sr      N   Sl
+                                */
+                               parent->rb_right = tmp1 = sibling->rb_left;
+                               sibling->rb_left = parent;
+                               rb_set_parent_color(tmp1, parent, RB_BLACK);
+                               __rb_rotate_set_parents(parent, sibling, root,
+                                                       RB_RED);
+                               augment_rotate(parent, sibling);
+                               sibling = tmp1;
+                       }
+                       tmp1 = sibling->rb_right;
+                       if (!tmp1 || rb_is_black(tmp1)) {
+                               tmp2 = sibling->rb_left;
+                               if (!tmp2 || rb_is_black(tmp2)) {
+                                       /*
+                                        * Case 2 - sibling color flip
+                                        * (p could be either color here)
+                                        *
+                                        *    (p)           (p)
+                                        *    / \           / \
+                                        *   N   S    -->  N   s
+                                        *      / \           / \
+                                        *     Sl  Sr        Sl  Sr
+                                        *
+                                        * This leaves us violating 5) which
+                                        * can be fixed by flipping p to black
+                                        * if it was red, or by recursing at p.
+                                        * p is red when coming from Case 1.
+                                        */
+                                       rb_set_parent_color(sibling, parent,
+                                                           RB_RED);
+                                       if (rb_is_red(parent))
+                                               rb_set_black(parent);
+                                       else {
+                                               node = parent;
+                                               parent = rb_parent(node);
+                                               if (parent)
+                                                       continue;
+                                       }
+                                       break;
+                               }
+                               /*
+                                * Case 3 - right rotate at sibling
+                                * (p could be either color here)
+                                *
+                                *   (p)           (p)
+                                *   / \           / \
+                                *  N   S    -->  N   Sl
+                                *     / \             \
+                                *    sl  Sr            s
+                                *                       \
+                                *                        Sr
+                                */
+                               sibling->rb_left = tmp1 = tmp2->rb_right;
+                               tmp2->rb_right = sibling;
+                               parent->rb_right = tmp2;
+                               if (tmp1)
+                                       rb_set_parent_color(tmp1, sibling,
+                                                           RB_BLACK);
+                               augment_rotate(sibling, tmp2);
+                               tmp1 = sibling;
+                               sibling = tmp2;
+                       }
+                       /*
+                        * Case 4 - left rotate at parent + color flips
+                        * (p and sl could be either color here.
+                        *  After rotation, p becomes black, s acquires
+                        *  p's color, and sl keeps its color)
+                        *
+                        *      (p)             (s)
+                        *      / \             / \
+                        *     N   S     -->   P   Sr
+                        *        / \         / \
+                        *      (sl) sr      N  (sl)
+                        */
+                       parent->rb_right = tmp2 = sibling->rb_left;
+                       sibling->rb_left = parent;
+                       rb_set_parent_color(tmp1, sibling, RB_BLACK);
+                       if (tmp2)
+                               rb_set_parent(tmp2, parent);
+                       __rb_rotate_set_parents(parent, sibling, root,
+                                               RB_BLACK);
+                       augment_rotate(parent, sibling);
+                       break;
+               } else {
+                       sibling = parent->rb_left;
+                       if (rb_is_red(sibling)) {
+                               /* Case 1 - right rotate at parent */
+                               parent->rb_left = tmp1 = sibling->rb_right;
+                               sibling->rb_right = parent;
+                               rb_set_parent_color(tmp1, parent, RB_BLACK);
+                               __rb_rotate_set_parents(parent, sibling, root,
+                                                       RB_RED);
+                               augment_rotate(parent, sibling);
+                               sibling = tmp1;
+                       }
+                       tmp1 = sibling->rb_left;
+                       if (!tmp1 || rb_is_black(tmp1)) {
+                               tmp2 = sibling->rb_right;
+                               if (!tmp2 || rb_is_black(tmp2)) {
+                                       /* Case 2 - sibling color flip */
+                                       rb_set_parent_color(sibling, parent,
+                                                           RB_RED);
+                                       if (rb_is_red(parent))
+                                               rb_set_black(parent);
+                                       else {
+                                               node = parent;
+                                               parent = rb_parent(node);
+                                               if (parent)
+                                                       continue;
+                                       }
+                                       break;
+                               }
+                               /* Case 3 - right rotate at sibling */
+                               sibling->rb_right = tmp1 = tmp2->rb_left;
+                               tmp2->rb_left = sibling;
+                               parent->rb_left = tmp2;
+                               if (tmp1)
+                                       rb_set_parent_color(tmp1, sibling,
+                                                           RB_BLACK);
+                               augment_rotate(sibling, tmp2);
+                               tmp1 = sibling;
+                               sibling = tmp2;
+                       }
+                       /* Case 4 - left rotate at parent + color flips */
+                       parent->rb_left = tmp2 = sibling->rb_right;
+                       sibling->rb_right = parent;
+                       rb_set_parent_color(tmp1, sibling, RB_BLACK);
+                       if (tmp2)
+                               rb_set_parent(tmp2, parent);
+                       __rb_rotate_set_parents(parent, sibling, root,
+                                               RB_BLACK);
+                       augment_rotate(parent, sibling);
+                       break;
+               }
+       }
+}
+
+/* Non-inline version for rb_erase_augmented() use */
+void __rb_erase_color(struct rb_node *parent, struct rb_root *root,
+       void (*augment_rotate)(struct rb_node *old, struct rb_node *new))
+{
+       ____rb_erase_color(parent, root, augment_rotate);
+}
+
+/*
+ * Non-augmented rbtree manipulation functions.
+ *
+ * We use dummy augmented callbacks here, and have the compiler optimize them
+ * out of the rb_insert_color() and rb_erase() function definitions.
+ */
+
+static inline void dummy_propagate(struct rb_node *node, struct rb_node *stop) {}
+static inline void dummy_copy(struct rb_node *old, struct rb_node *new) {}
+static inline void dummy_rotate(struct rb_node *old, struct rb_node *new) {}
+
+static const struct rb_augment_callbacks dummy_callbacks = {
+       dummy_propagate, dummy_copy, dummy_rotate
+};
+
+void rb_insert_color(struct rb_node *node, struct rb_root *root)
+{
+       __rb_insert(node, root, dummy_rotate);
+}
+
+void rb_erase(struct rb_node *node, struct rb_root *root)
+{
+       struct rb_node *rebalance;
+       rebalance = __rb_erase_augmented(node, root, &dummy_callbacks);
+       if (rebalance)
+               ____rb_erase_color(rebalance, root, dummy_rotate);
+}
+
+/*
+ * Augmented rbtree manipulation functions.
+ *
+ * This instantiates the same __always_inline functions as in the non-augmented
+ * case, but this time with user-defined callbacks.
+ */
+
+void __rb_insert_augmented(struct rb_node *node, struct rb_root *root,
+       void (*augment_rotate)(struct rb_node *old, struct rb_node *new))
+{
+       __rb_insert(node, root, augment_rotate);
+}
+
+/*
+ * This function returns the first node (in sort order) of the tree.
+ */
+struct rb_node *rb_first(const 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;
+}
+
+struct rb_node *rb_last(const 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;
+}
+
+struct rb_node *rb_next(const struct rb_node *node)
+{
+       struct rb_node *parent;
+
+       if (RB_EMPTY_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 (struct rb_node *)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;
+}
+
+struct rb_node *rb_prev(const struct rb_node *node)
+{
+       struct rb_node *parent;
+
+       if (RB_EMPTY_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 (struct rb_node *)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;
+}
+
+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 */
+       __rb_change_child(victim, new, parent, root);
+       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;
+}
+
+static struct rb_node *rb_left_deepest_node(const struct rb_node *node)
+{
+       for (;;) {
+               if (node->rb_left)
+                       node = node->rb_left;
+               else if (node->rb_right)
+                       node = node->rb_right;
+               else
+                       return (struct rb_node *)node;
+       }
+}
+
+struct rb_node *rb_next_postorder(const struct rb_node *node)
+{
+       const struct rb_node *parent;
+       if (!node)
+               return NULL;
+       parent = rb_parent(node);
+
+       /* If we're sitting on node, we've already seen our children */
+       if (parent && node == parent->rb_left && parent->rb_right) {
+               /* If we are the parent's left node, go to the parent's right
+                * node then all the way down to the left */
+               return rb_left_deepest_node(parent->rb_right);
+       } else
+               /* Otherwise we are the parent's right node, and the parent
+                * should be next */
+               return (struct rb_node *)parent;
+}
+
+struct rb_node *rb_first_postorder(const struct rb_root *root)
+{
+       if (!root->rb_node)
+               return NULL;
+
+       return rb_left_deepest_node(root->rb_node);
+}
index 6504b727f4508092bbc851fc215d8a3037144680..ff667e36ca521af8c02cd9e8939b990cbfb04c5a 100644 (file)
@@ -18,6 +18,7 @@ tools/arch/x86/include/asm/atomic.h
 tools/arch/x86/include/asm/rmwcc.h
 tools/lib/traceevent
 tools/lib/api
+tools/lib/rbtree.c
 tools/lib/symbol/kallsyms.c
 tools/lib/symbol/kallsyms.h
 tools/lib/util/find_next_bit.c
@@ -55,7 +56,6 @@ include/linux/list.h
 include/linux/hash.h
 include/linux/stringify.h
 lib/hweight.c
-lib/rbtree.c
 include/linux/swab.h
 arch/*/include/asm/unistd*.h
 arch/*/include/uapi/asm/unistd*.h
index 586a59d46022a9fc8901807f5c02be4e2551db25..601d11440596dfd2b1d5244f56e972487d3fecff 100644 (file)
@@ -139,7 +139,7 @@ $(OUTPUT)util/find_next_bit.o: ../lib/util/find_next_bit.c FORCE
        $(call rule_mkdir)
        $(call if_changed_dep,cc_o_c)
 
-$(OUTPUT)util/rbtree.o: ../../lib/rbtree.c FORCE
+$(OUTPUT)util/rbtree.o: ../lib/rbtree.c FORCE
        $(call rule_mkdir)
        $(call if_changed_dep,cc_o_c)