linux-kernel - [PATCH bpf-next 6/7] bpf: use rcu_migrate_* for bpf_prog_run_array

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Message-ID: <20250815061824.765906-7-dongml2@chinatelecom.cn>
Date: Fri, 15 Aug 2025 14:18:23 +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 6/7] bpf: use rcu_migrate_* for bpf_prog_run_array_cg()

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

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

diff --git a/kernel/bpf/cgroup.c b/kernel/bpf/cgroup.c
index 180b630279b9..694635699d46 100644
--- a/kernel/bpf/cgroup.c
+++ b/kernel/bpf/cgroup.c
@@ -71,7 +71,7 @@ bpf_prog_run_array_cg(const struct cgroup_bpf *cgrp,
 	u32 func_ret;
 
 	run_ctx.retval = retval;
-	migrate_disable();
+	rcu_migrate_disable();
 	rcu_read_lock();
 	array = rcu_dereference(cgrp->effective[atype]);
 	item = &array->items[0];
@@ -89,7 +89,7 @@ bpf_prog_run_array_cg(const struct cgroup_bpf *cgrp,
 	}
 	bpf_reset_run_ctx(old_run_ctx);
 	rcu_read_unlock();
-	migrate_enable();
+	rcu_migrate_enable();
 	return run_ctx.retval;
 }
 
-- 
2.50.1