From: Hou Tao <houtao1@huawei.com>
Date: Fri, 8 Dec 2023 10:23:49 +0000 (+0800)
Subject: bpf: Remove unnecessary wait from bpf_map_copy_value()
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=c26f2a8901393c9f81909da0a4324587092bd3a3;p=linux.git

bpf: Remove unnecessary wait from bpf_map_copy_value()

Both map_lookup_elem() and generic_map_lookup_batch() use
bpf_map_copy_value() to lookup and copy the value, and there is no
update operation in bpf_map_copy_value(), so just remove the invocation
of maybe_wait_bpf_programs() from it.

Fixes: 15c14a3dca42 ("bpf: Add bpf_map_{value_size, update_value, map_copy_value} functions")
Signed-off-by: Hou Tao <houtao1@huawei.com>
Link: https://lore.kernel.org/r/20231208102355.2628918-2-houtao@huaweicloud.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
---

diff --git a/kernel/bpf/syscall.c b/kernel/bpf/syscall.c
index aff045eed375e..9ad3f527ab372 100644
--- a/kernel/bpf/syscall.c
+++ b/kernel/bpf/syscall.c
@@ -264,7 +264,6 @@ static int bpf_map_copy_value(struct bpf_map *map, void *key, void *value,
 	}
 
 	bpf_enable_instrumentation();
-	maybe_wait_bpf_programs(map);
 
 	return err;
 }