linux-kernel - [PATCH bpf-next 5/7] bpf: use rcu_migrate_* for bpf_task_storage

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Message-ID: <20250815061824.765906-6-dongml2@chinatelecom.cn>
Date: Fri, 15 Aug 2025 14:18:22 +0800
From: Menglong Dong <menglong8.dong@...il.com>
To: ast@...nel.org
Cc: daniel@...earbox.net,
	john.fastabend@...il.com,
	andrii@...nel.org,
	martin.lau@...ux.dev,
	eddyz87@...il.com,
	song@...nel.org,
	yonghong.song@...ux.dev,
	kpsingh@...nel.org,
	sdf@...ichev.me,
	haoluo@...gle.com,
	jolsa@...nel.org,
	bpf@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH bpf-next 5/7] bpf: use rcu_migrate_* for bpf_task_storage_free()

Replace the migrate_disable/migrate_enable with
rcu_migrate_disable/rcu_migrate_enable in bpf_task_storage_free to obtain
better performance when PREEMPT_RCU is not enabled.

Signed-off-by: Menglong Dong <dongml2@...natelecom.cn>
---
 kernel/bpf/bpf_task_storage.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/kernel/bpf/bpf_task_storage.c b/kernel/bpf/bpf_task_storage.c
index 1109475953c0..cbbf1b72eece 100644
--- a/kernel/bpf/bpf_task_storage.c
+++ b/kernel/bpf/bpf_task_storage.c
@@ -70,7 +70,7 @@ void bpf_task_storage_free(struct task_struct *task)
 {
 	struct bpf_local_storage *local_storage;
 
-	migrate_disable();
+	rcu_migrate_disable();
 	rcu_read_lock();
 
 	local_storage = rcu_dereference(task->bpf_storage);
@@ -82,7 +82,7 @@ void bpf_task_storage_free(struct task_struct *task)
 	bpf_task_storage_unlock();
 out:
 	rcu_read_unlock();
-	migrate_enable();
+	rcu_migrate_enable();
 }
 
 static void *bpf_pid_task_storage_lookup_elem(struct bpf_map *map, void *key)
-- 
2.50.1