ftrace: Export some of hash related functions

We are going to use these functions in following changes.

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Reviewed-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Link: https://lore.kernel.org/bpf/20251230145010.103439-4-jolsa@kernel.org

diff --git a/include/linux/ftrace.h b/include/linux/ftrace.h
index cc869c59c1a68ad999cc3391c29b04005101d669..a77b57a4aba2c22b2d9f8a81f5bb75b57fb9f843 100644 (file)
--- a/include/linux/ftrace.h
+++ b/include/linux/ftrace.h
@@ -82,6 +82,7 @@ static inline void early_trace_init(void) { }
 
 struct module;
 struct ftrace_hash;
+struct ftrace_func_entry;
 
 #if defined(CONFIG_FUNCTION_TRACER) && defined(CONFIG_MODULES) && \
        defined(CONFIG_DYNAMIC_FTRACE)
@@ -405,6 +406,14 @@ enum ftrace_ops_cmd {
 typedef int (*ftrace_ops_func_t)(struct ftrace_ops *op, enum ftrace_ops_cmd cmd);
 
 #ifdef CONFIG_DYNAMIC_FTRACE
+
+#define FTRACE_HASH_DEFAULT_BITS 10
+
+struct ftrace_hash *alloc_ftrace_hash(int size_bits);
+void free_ftrace_hash(struct ftrace_hash *hash);
+struct ftrace_func_entry *add_ftrace_hash_entry_direct(struct ftrace_hash *hash,
+                                                      unsigned long ip, unsigned long direct);
+
 /* The hash used to know what functions callbacks trace */
 struct ftrace_ops_hash {
        struct ftrace_hash __rcu        *notrace_hash;

diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
index 2a63860c172e9fbd5c531560a8018c84769653ea..bf0ca563e91f1c4ce1d759dc1e1f58ee87d038f3 100644 (file)
--- a/kernel/trace/ftrace.c
+++ b/kernel/trace/ftrace.c
@@ -68,7 +68,6 @@
        })
 
 /* hash bits for specific function selection */
-#define FTRACE_HASH_DEFAULT_BITS 10
 #define FTRACE_HASH_MAX_BITS 12
 
 #ifdef CONFIG_DYNAMIC_FTRACE
@@ -1211,8 +1210,8 @@ static void __add_hash_entry(struct ftrace_hash *hash,
        hash->count++;
 }
 
-static struct ftrace_func_entry *
-add_hash_entry_direct(struct ftrace_hash *hash, unsigned long ip, unsigned long direct)
+struct ftrace_func_entry *
+add_ftrace_hash_entry_direct(struct ftrace_hash *hash, unsigned long ip, unsigned long direct)
 {
        struct ftrace_func_entry *entry;
 
@@ -1230,7 +1229,7 @@ add_hash_entry_direct(struct ftrace_hash *hash, unsigned long ip, unsigned long
 static struct ftrace_func_entry *
 add_hash_entry(struct ftrace_hash *hash, unsigned long ip)
 {
-       return add_hash_entry_direct(hash, ip, 0);
+       return add_ftrace_hash_entry_direct(hash, ip, 0);
 }
 
 static void
@@ -1291,7 +1290,7 @@ static void clear_ftrace_mod_list(struct list_head *head)
        mutex_unlock(&ftrace_lock);
 }
 
-static void free_ftrace_hash(struct ftrace_hash *hash)
+void free_ftrace_hash(struct ftrace_hash *hash)
 {
        if (!hash || hash == EMPTY_HASH)
                return;
@@ -1331,7 +1330,7 @@ void ftrace_free_filter(struct ftrace_ops *ops)
 }
 EXPORT_SYMBOL_GPL(ftrace_free_filter);
 
-static struct ftrace_hash *alloc_ftrace_hash(int size_bits)
+struct ftrace_hash *alloc_ftrace_hash(int size_bits)
 {
        struct ftrace_hash *hash;
        int size;
@@ -1405,7 +1404,7 @@ alloc_and_copy_ftrace_hash(int size_bits, struct ftrace_hash *hash)
        size = 1 << hash->size_bits;
        for (i = 0; i < size; i++) {
                hlist_for_each_entry(entry, &hash->buckets[i], hlist) {
-                       if (add_hash_entry_direct(new_hash, entry->ip, entry->direct) == NULL)
+                       if (add_ftrace_hash_entry_direct(new_hash, entry->ip, entry->direct) == NULL)
                                goto free_hash;
                }
        }