netdev - [RFC PATCH bpf-next v1 08/11] bpf: Remove unused percpu counter from bpf_local_storage_map

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20250729182550.185356-9-ameryhung@gmail.com>
Date: Tue, 29 Jul 2025 11:25:46 -0700
From: Amery Hung <ameryhung@...il.com>
To: bpf@...r.kernel.org
Cc: netdev@...r.kernel.org,
	alexei.starovoitov@...il.com,
	andrii@...nel.org,
	daniel@...earbox.net,
	memxor@...il.com,
	kpsingh@...nel.org,
	martin.lau@...nel.org,
	yonghong.song@...ux.dev,
	song@...nel.org,
	haoluo@...gle.com,
	ameryhung@...il.com,
	kernel-team@...a.com
Subject: [RFC PATCH bpf-next v1 08/11] bpf: Remove unused percpu counter from bpf_local_storage_map_free

Percpu locks have been removed from cgroup and task local storage. Now
that all local storage no longer use percpu variables as locks preventing
recursion, there is no need to pass them to bpf_local_storage_map_free().
Remove the argument from the function.

Signed-off-by: Amery Hung <ameryhung@...il.com>
---
 include/linux/bpf_local_storage.h | 3 +--
 kernel/bpf/bpf_cgrp_storage.c     | 2 +-
 kernel/bpf/bpf_inode_storage.c    | 2 +-
 kernel/bpf/bpf_local_storage.c    | 7 +------
 kernel/bpf/bpf_task_storage.c     | 2 +-
 net/core/bpf_sk_storage.c         | 2 +-
 6 files changed, 6 insertions(+), 12 deletions(-)

diff --git a/include/linux/bpf_local_storage.h b/include/linux/bpf_local_storage.h
index 2a0aae5168fa..5888e012dfe3 100644
--- a/include/linux/bpf_local_storage.h
+++ b/include/linux/bpf_local_storage.h
@@ -170,8 +170,7 @@ bpf_local_storage_lookup(struct bpf_local_storage *local_storage,
 void bpf_local_storage_destroy(struct bpf_local_storage *local_storage);
 
 void bpf_local_storage_map_free(struct bpf_map *map,
-				struct bpf_local_storage_cache *cache,
-				int __percpu *busy_counter);
+				struct bpf_local_storage_cache *cache);
 
 int bpf_local_storage_map_check_btf(const struct bpf_map *map,
 				    const struct btf *btf,
diff --git a/kernel/bpf/bpf_cgrp_storage.c b/kernel/bpf/bpf_cgrp_storage.c
index 4f9cfa032870..a57abb2956d5 100644
--- a/kernel/bpf/bpf_cgrp_storage.c
+++ b/kernel/bpf/bpf_cgrp_storage.c
@@ -119,7 +119,7 @@ static struct bpf_map *cgroup_storage_map_alloc(union bpf_attr *attr)
 
 static void cgroup_storage_map_free(struct bpf_map *map)
 {
-	bpf_local_storage_map_free(map, &cgroup_cache, NULL);
+	bpf_local_storage_map_free(map, &cgroup_cache);
 }
 
 /* *gfp_flags* is a hidden argument provided by the verifier */
diff --git a/kernel/bpf/bpf_inode_storage.c b/kernel/bpf/bpf_inode_storage.c
index e55c3e0f5bb9..46985acff0dd 100644
--- a/kernel/bpf/bpf_inode_storage.c
+++ b/kernel/bpf/bpf_inode_storage.c
@@ -186,7 +186,7 @@ static struct bpf_map *inode_storage_map_alloc(union bpf_attr *attr)
 
 static void inode_storage_map_free(struct bpf_map *map)
 {
-	bpf_local_storage_map_free(map, &inode_cache, NULL);
+	bpf_local_storage_map_free(map, &inode_cache);
 }
 
 const struct bpf_map_ops inode_storage_map_ops = {
diff --git a/kernel/bpf/bpf_local_storage.c b/kernel/bpf/bpf_local_storage.c
index 5faa1df4fc50..94d7e7f88572 100644
--- a/kernel/bpf/bpf_local_storage.c
+++ b/kernel/bpf/bpf_local_storage.c
@@ -935,8 +935,7 @@ bpf_local_storage_map_alloc(union bpf_attr *attr,
 }
 
 void bpf_local_storage_map_free(struct bpf_map *map,
-				struct bpf_local_storage_cache *cache,
-				int __percpu *busy_counter)
+				struct bpf_local_storage_cache *cache)
 {
 	struct bpf_local_storage_map_bucket *b;
 	struct bpf_local_storage_elem *selem;
@@ -969,11 +968,7 @@ void bpf_local_storage_map_free(struct bpf_map *map,
 		while ((selem = hlist_entry_safe(
 				rcu_dereference_raw(hlist_first_rcu(&b->list)),
 				struct bpf_local_storage_elem, map_node))) {
-			if (busy_counter)
-				this_cpu_inc(*busy_counter);
 			WARN_ON(bpf_selem_unlink(selem, true));
-			if (busy_counter)
-				this_cpu_dec(*busy_counter);
 			cond_resched_rcu();
 		}
 		rcu_read_unlock();
diff --git a/kernel/bpf/bpf_task_storage.c b/kernel/bpf/bpf_task_storage.c
index ff1e2e4cc5b5..b9d8c029c0e5 100644
--- a/kernel/bpf/bpf_task_storage.c
+++ b/kernel/bpf/bpf_task_storage.c
@@ -218,7 +218,7 @@ static struct bpf_map *task_storage_map_alloc(union bpf_attr *attr)
 
 static void task_storage_map_free(struct bpf_map *map)
 {
-	bpf_local_storage_map_free(map, &task_cache, NULL);
+	bpf_local_storage_map_free(map, &task_cache);
 }
 
 BTF_ID_LIST_GLOBAL_SINGLE(bpf_local_storage_map_btf_id, struct, bpf_local_storage_map)
diff --git a/net/core/bpf_sk_storage.c b/net/core/bpf_sk_storage.c
index 7b3d44667cee..7037b841cf11 100644
--- a/net/core/bpf_sk_storage.c
+++ b/net/core/bpf_sk_storage.c
@@ -62,7 +62,7 @@ void bpf_sk_storage_free(struct sock *sk)
 
 static void bpf_sk_storage_map_free(struct bpf_map *map)
 {
-	bpf_local_storage_map_free(map, &sk_cache, NULL);
+	bpf_local_storage_map_free(map, &sk_cache);
 }
 
 static struct bpf_map *bpf_sk_storage_map_alloc(union bpf_attr *attr)
-- 
2.47.3