linux-kernel - [PATCHv6 bpf-next 3/9] ftrace: Export some of hash related functions

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Message-ID: <20251230145010.103439-4-jolsa@kernel.org>
Date: Tue, 30 Dec 2025 15:50:04 +0100
From: Jiri Olsa <jolsa@...nel.org>
To: Steven Rostedt <rostedt@...nel.org>,
	Florent Revest <revest@...gle.com>,
	Mark Rutland <mark.rutland@....com>
Cc: bpf@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-trace-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	Alexei Starovoitov <ast@...nel.org>,
	Daniel Borkmann <daniel@...earbox.net>,
	Andrii Nakryiko <andrii@...nel.org>,
	Menglong Dong <menglong8.dong@...il.com>,
	Song Liu <song@...nel.org>
Subject: [PATCHv6 bpf-next 3/9] ftrace: Export some of hash related functions

We are going to use these functions in following changes.

Signed-off-by: Jiri Olsa <jolsa@...nel.org>
---
 include/linux/ftrace.h |  9 +++++++++
 kernel/trace/ftrace.c  | 13 ++++++-------
 2 files changed, 15 insertions(+), 7 deletions(-)

diff --git a/include/linux/ftrace.h b/include/linux/ftrace.h
index 41c9bb08d4e4..472f2d8a4c0f 100644
--- 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 409271aa8dad..3ca3aee5f886 100644
--- 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;
 		}
 	}
-- 
2.52.0