netdev - [PATCH bpf-next v1] bpf: Remove the unnecessary insn buffer comparison

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Date:   Sun,  8 Jan 2023 23:12:57 +0800
From:   Haiyue Wang <haiyue.wang@...el.com>
To:     bpf@...r.kernel.org
Cc:     Haiyue Wang <haiyue.wang@...el.com>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>,
        Martin KaFai Lau <martin.lau@...ux.dev>,
        Song Liu <song@...nel.org>, Yonghong Song <yhs@...com>,
        John Fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...nel.org>,
        Stanislav Fomichev <sdf@...gle.com>,
        Hao Luo <haoluo@...gle.com>, Jiri Olsa <jolsa@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        netdev@...r.kernel.org (open list:BPF [NETWORKING] (tc BPF, sock_addr)),
        linux-kernel@...r.kernel.org (open list)
Subject: [PATCH bpf-next v1] bpf: Remove the unnecessary insn buffer comparison

The variable 'insn' is initialized to 'insn_buf' without being changed,
only some helper macros are defined, so the insn buffer comparison is
unnecessary, just remove it.

Signed-off-by: Haiyue Wang <haiyue.wang@...el.com>
---
 net/core/filter.c | 6 ------
 1 file changed, 6 deletions(-)

diff --git a/net/core/filter.c b/net/core/filter.c
index ab811293ae5d..d9befa6ba04e 100644
--- a/net/core/filter.c
+++ b/net/core/filter.c
@@ -6847,9 +6847,6 @@ u32 bpf_tcp_sock_convert_ctx_access(enum bpf_access_type type,
 					FIELD));			\
 	} while (0)
 
-	if (insn > insn_buf)
-		return insn - insn_buf;
-
 	switch (si->off) {
 	case offsetof(struct bpf_tcp_sock, rtt_min):
 		BUILD_BUG_ON(sizeof_field(struct tcp_sock, rtt_min) !=
@@ -10147,9 +10144,6 @@ static u32 sock_ops_convert_ctx_access(enum bpf_access_type type,
 			SOCK_OPS_GET_FIELD(BPF_FIELD, OBJ_FIELD, OBJ);	      \
 	} while (0)
 
-	if (insn > insn_buf)
-		return insn - insn_buf;
-
 	switch (si->off) {
 	case offsetof(struct bpf_sock_ops, op):
 		*insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct bpf_sock_ops_kern,
-- 
2.39.0