linux-kernel - [PATCH bpf-next v2] bpf: Replace get_next_cpu() with cpumask_next

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Message-ID: <20250818032344.23229-1-wangfushuai@baidu.com>
Date: Mon, 18 Aug 2025 11:23:44 +0800
From: Fushuai Wang <wangfushuai@...du.com>
To: <linux-kernel@...r.kernel.org>, <bpf@...r.kernel.org>,
	<martin.lau@...ux.dev>, <ast@...nel.org>, <daniel@...earbox.net>,
	<andrii@...nel.org>
CC: <eddyz87@...il.com>, <song@...nel.org>, <yonghong.song@...ux.dev>,
	<john.fastabend@...il.com>, <kpsingh@...nel.org>, <sdf@...ichev.me>,
	<haoluo@...gle.com>, <jolsa@...nel.org>, Fushuai Wang <wangfushuai@...du.com>
Subject: [PATCH bpf-next v2] bpf: Replace get_next_cpu() with cpumask_next_wrap()

The get_next_cpu() function was only used in one place to find
the next possible CPU, which can be replaced by cpumask_next_wrap().

Signed-off-by: Fushuai Wang <wangfushuai@...du.com>
---
 kernel/bpf/bpf_lru_list.c | 10 +---------
 1 file changed, 1 insertion(+), 9 deletions(-)

diff --git a/kernel/bpf/bpf_lru_list.c b/kernel/bpf/bpf_lru_list.c
index 2d6e1c98d8ad..e7a2fc60523f 100644
--- a/kernel/bpf/bpf_lru_list.c
+++ b/kernel/bpf/bpf_lru_list.c
@@ -19,14 +19,6 @@
 #define LOCAL_PENDING_LIST_IDX	LOCAL_LIST_IDX(BPF_LRU_LOCAL_LIST_T_PENDING)
 #define IS_LOCAL_LIST_TYPE(t)	((t) >= BPF_LOCAL_LIST_T_OFFSET)
 
-static int get_next_cpu(int cpu)
-{
-	cpu = cpumask_next(cpu, cpu_possible_mask);
-	if (cpu >= nr_cpu_ids)
-		cpu = cpumask_first(cpu_possible_mask);
-	return cpu;
-}
-
 /* Local list helpers */
 static struct list_head *local_free_list(struct bpf_lru_locallist *loc_l)
 {
@@ -482,7 +474,7 @@ static struct bpf_lru_node *bpf_common_lru_pop_free(struct bpf_lru *lru,
 
 		raw_spin_unlock_irqrestore(&steal_loc_l->lock, flags);
 
-		steal = get_next_cpu(steal);
+		steal = cpumask_next_wrap(steal, cpu_possible_mask);
 	} while (!node && steal != first_steal);
 
 	loc_l->next_steal = steal;
-- 
2.36.1