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Message-Id: <20200429153549.006661686@infradead.org>
Date: Wed, 29 Apr 2020 17:32:59 +0200
From: Peter Zijlstra <peterz@...radead.org>
To: linux-kernel@...r.kernel.org
Cc: walken@...gle.com, dave@...olabs.net, mingo@...nel.org,
tglx@...utronix.de, oleg@...hat.com, irogers@...gle.com,
juri.lelli@...hat.com, vincent.guittot@...aro.org,
peterz@...radead.org
Subject: [RFC][PATCH 1/7] rbtree: Add generic add and find helpers
I've always been bothered by the endless (fragile) boilerplate for
rbtree, and I recently wrote some rbtree helpers for objtool and
figured I should lift them into the kernel and use them more widely.
Provide:
partial-order; less() based:
- rb_add(): add a new entry to the rbtree
- rb_add_cached(): like rb_add(), but for a rb_root_cached
total-order; cmp() based:
- rb_find(): find an entry in an rbtree
- rb_find_first(): find the first (leftmost) matching entry
- rb_next_match(): continue from rb_find_first()
- rb_for_each(): for loop with rb_find_first() / rb_next_match()
Also make rb_add_cached() / rb_erase_cached() return true when
leftmost.
Inlining and constant propagation should see the compiler inline the
whole thing, including the various compare functions.
Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
---
include/linux/rbtree.h | 127 +++++++++++++++++++++++++++++++++++++++++-
tools/include/linux/rbtree.h | 129 ++++++++++++++++++++++++++++++++++++++++++-
tools/objtool/elf.c | 63 ++-------------------
3 files changed, 257 insertions(+), 62 deletions(-)
--- a/include/linux/rbtree.h
+++ b/include/linux/rbtree.h
@@ -141,12 +141,18 @@ static inline void rb_insert_color_cache
rb_insert_color(node, &root->rb_root);
}
-static inline void rb_erase_cached(struct rb_node *node,
+static inline bool rb_erase_cached(struct rb_node *node,
struct rb_root_cached *root)
{
- if (root->rb_leftmost == node)
+ bool leftmost = false;
+
+ if (root->rb_leftmost == node) {
root->rb_leftmost = rb_next(node);
+ leftmost = true;
+ }
rb_erase(node, &root->rb_root);
+
+ return leftmost;
}
static inline void rb_replace_node_cached(struct rb_node *victim,
@@ -158,4 +164,121 @@ static inline void rb_replace_node_cache
rb_replace_node(victim, new, &root->rb_root);
}
+static inline bool rb_add_cached(struct rb_root_cached *tree, struct rb_node *node,
+ bool (*less)(struct rb_node *, const struct rb_node *))
+{
+ struct rb_node **link = &tree->rb_root.rb_node;
+ struct rb_node *parent = NULL;
+ bool leftmost = true;
+
+ while (*link) {
+ parent = *link;
+ if (less(node, parent)) {
+ link = &parent->rb_left;
+ } else {
+ link = &parent->rb_right;
+ leftmost = false;
+ }
+ }
+
+ rb_link_node(node, parent, link);
+ rb_insert_color_cached(node, tree, leftmost);
+
+ return leftmost;
+}
+
+static inline void rb_add(struct rb_root *tree, struct rb_node *node,
+ bool (*less)(struct rb_node *, const struct rb_node *))
+{
+ struct rb_node **link = &tree->rb_node;
+ struct rb_node *parent = NULL;
+
+ while (*link) {
+ parent = *link;
+ if (less(node, parent))
+ link = &parent->rb_left;
+ else
+ link = &parent->rb_right;
+ }
+
+ rb_link_node(node, parent, link);
+ rb_insert_color(node, tree);
+}
+
+static inline struct rb_node *rb_find_add(struct rb_root *tree, struct rb_node *node,
+ int (*cmp)(struct rb_node *, const struct rb_node *))
+{
+ struct rb_node **link = &tree->rb_node;
+ struct rb_node *parent = NULL;
+ int c;
+
+ while (*link) {
+ parent = *link;
+ c = cmp(node, parent);
+
+ if (c < 0)
+ link = &parent->rb_left;
+ else if (c > 0)
+ link = &parent->rb_right;
+ else
+ return parent;
+ }
+
+ rb_link_node(node, parent, link);
+ rb_insert_color(node, tree);
+ return NULL;
+}
+
+static inline struct rb_node *rb_find(struct rb_root *tree, const void *key,
+ int (*cmp)(const void *key, const struct rb_node *))
+{
+ struct rb_node *node = tree->rb_node;
+
+ while (node) {
+ int c = cmp(key, node);
+ if (c < 0) {
+ node = node->rb_left;
+ } else if (c > 0) {
+ node = node->rb_right;
+ } else
+ return node;
+ }
+
+ return NULL;
+}
+
+static inline struct rb_node *rb_find_first(struct rb_root *tree, const void *key,
+ int (*cmp)(const void *key, const struct rb_node *))
+{
+ struct rb_node *node = tree->rb_node;
+ struct rb_node *match = NULL;
+
+ while (node) {
+ int c = cmp(key, node);
+ if (c <= 0) {
+ if (!c)
+ match = node;
+ node = node->rb_left;
+ } else if (c > 0) {
+ node = node->rb_right;
+ }
+ }
+
+ return match;
+}
+
+static inline struct rb_node *rb_next_match(struct rb_node *node, const void *key,
+ int (*cmp)(const void *key, const struct rb_node *))
+{
+ node = rb_next(node);
+ if (node && cmp(key, node))
+ node = NULL;
+ return node;
+}
+
+#define rb_for_each(tree, node, key, cmp) \
+ for ((node) = rb_find_first((tree), (key), (cmp)); \
+ (node); (node) = rb_next_match((node), (key), (cmp)))
+
+
#endif /* _LINUX_RBTREE_H */
--- a/tools/include/linux/rbtree.h
+++ b/tools/include/linux/rbtree.h
@@ -135,12 +135,18 @@ static inline void rb_insert_color_cache
rb_insert_color(node, &root->rb_root);
}
-static inline void rb_erase_cached(struct rb_node *node,
+static inline bool rb_erase_cached(struct rb_node *node,
struct rb_root_cached *root)
{
- if (root->rb_leftmost == node)
+ bool leftmost = false;
+
+ if (root->rb_leftmost == node) {
root->rb_leftmost = rb_next(node);
+ leftmost = true;
+ }
rb_erase(node, &root->rb_root);
+
+ return leftmost;
}
static inline void rb_replace_node_cached(struct rb_node *victim,
@@ -152,4 +158,121 @@ static inline void rb_replace_node_cache
rb_replace_node(victim, new, &root->rb_root);
}
-#endif /* __TOOLS_LINUX_PERF_RBTREE_H */
+static inline bool rb_add_cached(struct rb_root_cached *tree, struct rb_node *node,
+ bool (*less)(struct rb_node *, const struct rb_node *))
+{
+ struct rb_node **link = &tree->rb_root.rb_node;
+ struct rb_node *parent = NULL;
+ bool leftmost = true;
+
+ while (*link) {
+ parent = *link;
+ if (less(node, parent)) {
+ link = &parent->rb_left;
+ } else {
+ link = &parent->rb_right;
+ leftmost = false;
+ }
+ }
+
+ rb_link_node(node, parent, link);
+ rb_insert_color_cached(node, tree, leftmost);
+
+ return leftmost;
+}
+
+static inline void rb_add(struct rb_root *tree, struct rb_node *node,
+ bool (*less)(struct rb_node *, const struct rb_node *))
+{
+ struct rb_node **link = &tree->rb_node;
+ struct rb_node *parent = NULL;
+
+ while (*link) {
+ parent = *link;
+ if (less(node, parent))
+ link = &parent->rb_left;
+ else
+ link = &parent->rb_right;
+ }
+
+ rb_link_node(node, parent, link);
+ rb_insert_color(node, tree);
+}
+
+static inline struct rb_node *rb_find_add(struct rb_root *tree, struct rb_node *node,
+ int (*cmp)(struct rb_node *, const struct rb_node *))
+{
+ struct rb_node **link = &tree->rb_node;
+ struct rb_node *parent = NULL;
+ int c;
+
+ while (*link) {
+ parent = *link;
+ c = cmp(node, parent);
+
+ if (c < 0)
+ link = &parent->rb_left;
+ else if (c > 0)
+ link = &parent->rb_right;
+ else
+ return parent;
+ }
+
+ rb_link_node(node, parent, link);
+ rb_insert_color(node, tree);
+ return NULL;
+}
+
+static inline struct rb_node *rb_find(struct rb_root *tree, const void *key,
+ int (*cmp)(const void *key, const struct rb_node *))
+{
+ struct rb_node *node = tree->rb_node;
+
+ while (node) {
+ int c = cmp(key, node);
+ if (c < 0) {
+ node = node->rb_left;
+ } else if (c > 0) {
+ node = node->rb_right;
+ } else
+ return node;
+ }
+
+ return NULL;
+}
+
+static inline struct rb_node *rb_find_first(struct rb_root *tree, const void *key,
+ int (*cmp)(const void *key, const struct rb_node *))
+{
+ struct rb_node *node = tree->rb_node;
+ struct rb_node *match = NULL;
+
+ while (node) {
+ int c = cmp(key, node);
+ if (c <= 0) {
+ if (!c)
+ match = node;
+ node = node->rb_left;
+ } else if (c > 0) {
+ node = node->rb_right;
+ }
+ }
+
+ return match;
+}
+
+static inline struct rb_node *rb_next_match(struct rb_node *node, const void *key,
+ int (*cmp)(const void *key, const struct rb_node *))
+{
+ node = rb_next(node);
+ if (node && cmp(key, node))
+ node = NULL;
+ return node;
+}
+
+#define rb_for_each(tree, node, key, cmp) \
+ for ((node) = rb_find_first((tree), (key), (cmp)); \
+ (node); (node) = rb_next_match((node), (key), (cmp)))
+
+
+#endif /* _LINUX_RBTREE_H */
--- a/tools/objtool/elf.c
+++ b/tools/objtool/elf.c
@@ -43,75 +43,24 @@ static void elf_hash_init(struct hlist_h
#define elf_hash_for_each_possible(name, obj, member, key) \
hlist_for_each_entry(obj, &name[hash_min(key, elf_hash_bits())], member)
-static void rb_add(struct rb_root *tree, struct rb_node *node,
- int (*cmp)(struct rb_node *, const struct rb_node *))
-{
- struct rb_node **link = &tree->rb_node;
- struct rb_node *parent = NULL;
-
- while (*link) {
- parent = *link;
- if (cmp(node, parent) < 0)
- link = &parent->rb_left;
- else
- link = &parent->rb_right;
- }
-
- rb_link_node(node, parent, link);
- rb_insert_color(node, tree);
-}
-
-static struct rb_node *rb_find_first(struct rb_root *tree, const void *key,
- int (*cmp)(const void *key, const struct rb_node *))
-{
- struct rb_node *node = tree->rb_node;
- struct rb_node *match = NULL;
-
- while (node) {
- int c = cmp(key, node);
- if (c <= 0) {
- if (!c)
- match = node;
- node = node->rb_left;
- } else if (c > 0) {
- node = node->rb_right;
- }
- }
-
- return match;
-}
-
-static struct rb_node *rb_next_match(struct rb_node *node, const void *key,
- int (*cmp)(const void *key, const struct rb_node *))
-{
- node = rb_next(node);
- if (node && cmp(key, node))
- node = NULL;
- return node;
-}
-
-#define rb_for_each(tree, node, key, cmp) \
- for ((node) = rb_find_first((tree), (key), (cmp)); \
- (node); (node) = rb_next_match((node), (key), (cmp)))
-
-static int symbol_to_offset(struct rb_node *a, const struct rb_node *b)
+static bool symbol_to_offset(struct rb_node *a, const struct rb_node *b)
{
struct symbol *sa = rb_entry(a, struct symbol, node);
struct symbol *sb = rb_entry(b, struct symbol, node);
if (sa->offset < sb->offset)
- return -1;
+ return true;
if (sa->offset > sb->offset)
- return 1;
+ return false;
if (sa->len < sb->len)
- return -1;
+ return true;
if (sa->len > sb->len)
- return 1;
+ return false;
sa->alias = sb;
- return 0;
+ return false;
}
static int symbol_by_offset(const void *key, const struct rb_node *node)
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