netdev - [PATCH bpf-next 17/19] bpf: Remove migrate_{disable|enable} from bpf_local_storage

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Message-Id: <20250106081900.1665573-18-houtao@huaweicloud.com>
Date: Mon,  6 Jan 2025 16:18:58 +0800
From: Hou Tao <houtao@...weicloud.com>
To: bpf@...r.kernel.org,
	netdev@...r.kernel.org
Cc: Martin KaFai Lau <martin.lau@...ux.dev>,
	Alexei Starovoitov <alexei.starovoitov@...il.com>,
	Andrii Nakryiko <andrii@...nel.org>,
	Eduard Zingerman <eddyz87@...il.com>,
	Song Liu <song@...nel.org>,
	Hao Luo <haoluo@...gle.com>,
	Yonghong Song <yonghong.song@...ux.dev>,
	Daniel Borkmann <daniel@...earbox.net>,
	KP Singh <kpsingh@...nel.org>,
	Stanislav Fomichev <sdf@...ichev.me>,
	Jiri Olsa <jolsa@...nel.org>,
	John Fastabend <john.fastabend@...il.com>,
	houtao1@...wei.com,
	xukuohai@...wei.com
Subject: [PATCH bpf-next 17/19] bpf: Remove migrate_{disable|enable} from bpf_local_storage_alloc()

From: Hou Tao <houtao1@...wei.com>

These two callers of bpf_local_storage_alloc() are the same as
bpf_selem_alloc(): bpf_sk_storage_clone() and
bpf_local_storage_update(). The running contexts of these two callers
have already disabled migration, therefore, there is no need to add
extra migrate_{disable|enable} pair in bpf_local_storage_alloc(). Also
add a cant_migrate() check in bpf_local_storage_alloc() to ensure such
guarantee will not be broken.

Signed-off-by: Hou Tao <houtao1@...wei.com>
---
 kernel/bpf/bpf_local_storage.c | 10 ++++------
 1 file changed, 4 insertions(+), 6 deletions(-)

diff --git a/kernel/bpf/bpf_local_storage.c b/kernel/bpf/bpf_local_storage.c
index fd48a2a17ccd..0970766278f7 100644
--- a/kernel/bpf/bpf_local_storage.c
+++ b/kernel/bpf/bpf_local_storage.c
@@ -500,15 +500,13 @@ int bpf_local_storage_alloc(void *owner,
 	if (err)
 		return err;
 
-	if (smap->bpf_ma) {
-		migrate_disable();
+	cant_migrate();
+
+	if (smap->bpf_ma)
 		storage = bpf_mem_cache_alloc_flags(&smap->storage_ma, gfp_flags);
-		migrate_enable();
-	} else {
+	else
 		storage = bpf_map_kzalloc(&smap->map, sizeof(*storage),
 					  gfp_flags | __GFP_NOWARN);
-	}
-
 	if (!storage) {
 		err = -ENOMEM;
 		goto uncharge;
-- 
2.29.2