linux-kernel - [PATCH bpf-next v3 3/5] bpf: Use 0 instead of NOT_INIT for btf_struct

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Message-Id: <919843fbb5b3488f2b5f66edbb49d54ef29e3bf6.1660951028.git.dxu@dxuuu.xyz>
Date:   Fri, 19 Aug 2022 17:23:32 -0600
From:   Daniel Xu <dxu@...uu.xyz>
To:     bpf@...r.kernel.org, ast@...nel.org, daniel@...earbox.net,
        andrii@...nel.org, memxor@...il.com
Cc:     Daniel Xu <dxu@...uu.xyz>, pablo@...filter.org, fw@...len.de,
        toke@...nel.org, martin.lau@...ux.dev,
        netfilter-devel@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH bpf-next v3 3/5] bpf: Use 0 instead of NOT_INIT for btf_struct_access() writes

Returning a bpf_reg_type only makes sense in the context of a BPF_READ.
For writes, prefer to explicitly return 0 for clarity.

Note that is non-functional change as it just so happened that NOT_INIT
== 0.

Signed-off-by: Daniel Xu <dxu@...uu.xyz>
---
 net/ipv4/bpf_tcp_ca.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/ipv4/bpf_tcp_ca.c b/net/ipv4/bpf_tcp_ca.c
index 85a9e500c42d..6da16ae6a962 100644
--- a/net/ipv4/bpf_tcp_ca.c
+++ b/net/ipv4/bpf_tcp_ca.c
@@ -124,7 +124,7 @@ static int bpf_tcp_ca_btf_struct_access(struct bpf_verifier_log *log,
 		return -EACCES;
 	}
 
-	return NOT_INIT;
+	return 0;
 }
 
 BPF_CALL_2(bpf_tcp_send_ack, struct tcp_sock *, tp, u32, rcv_nxt)
-- 
2.37.1