[PATCHv8 bpf-next 02/29] ftrace: Add ftrace_hash_remove function
From: Jiri Olsa <jolsa@kernel.org>
Date: 2026-06-06 12:40:21
Also in:
bpf
Subsystem:
function hooks (ftrace), the rest, tracing · Maintainers:
Steven Rostedt, Masami Hiramatsu, Linus Torvalds
Adding ftrace_hash_remove function that removes all entries from struct ftrace_hash object without freeing them. It will be used in following changes where entries are allocated as part of another structure and are free-ed separately. Signed-off-by: Jiri Olsa <jolsa@kernel.org> --- include/linux/ftrace.h | 1 + kernel/trace/ftrace.c | 19 +++++++++++++++++++ 2 files changed, 20 insertions(+)
diff --git a/include/linux/ftrace.h b/include/linux/ftrace.h
index 02c24bf766ce..b55ec9b25bb3 100644
--- a/include/linux/ftrace.h
+++ b/include/linux/ftrace.h@@ -415,6 +415,7 @@ 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); +void ftrace_hash_remove(struct ftrace_hash *hash); /* The hash used to know what functions callbacks trace */ struct ftrace_ops_hash {
diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
index 57ab01fd00bd..45548b0200eb 100644
--- a/kernel/trace/ftrace.c
+++ b/kernel/trace/ftrace.c@@ -1249,6 +1249,25 @@ remove_hash_entry(struct ftrace_hash *hash, hash->count--; } +void ftrace_hash_remove(struct ftrace_hash *hash) +{ + struct ftrace_func_entry *entry; + struct hlist_head *hhd; + struct hlist_node *tn; + int size; + int i; + + if (!hash || !hash->count) + return; + size = 1 << hash->size_bits; + for (i = 0; i < size; i++) { + hhd = &hash->buckets[i]; + hlist_for_each_entry_safe(entry, tn, hhd, hlist) + remove_hash_entry(hash, entry); + } + FTRACE_WARN_ON(hash->count); +} + static void ftrace_hash_clear(struct ftrace_hash *hash) { struct hlist_head *hhd;
--
2.54.0