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ftrace: Add ftrace_hash_remove function

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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>
Link: https://lore.kernel.org/r/20260606123955.345967-3-jolsa@kernel.org
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Jiri Olsa
2026-06-06 14:39:27 +02:00
committed by Alexei Starovoitov
parent e57f13eaab
commit af7c323650
2 changed files with 20 additions and 0 deletions
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1
include/linux/ftrace.h
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@@ -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 {

19
kernel/trace/ftrace.c
View File

@@ -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;