linux-kernel - [PATCH 1/2] bpf: hide unused bpf_patch_call

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Date:   Wed, 17 May 2023 14:56:08 +0200
From:   Arnd Bergmann <arnd@...nel.org>
To:     Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>
Cc:     Arnd Bergmann <arnd@...db.de>,
        John Fastabend <john.fastabend@...il.com>,
        Martin KaFai Lau <martin.lau@...ux.dev>,
        Song Liu <song@...nel.org>, Yonghong Song <yhs@...com>,
        KP Singh <kpsingh@...nel.org>,
        Stanislav Fomichev <sdf@...gle.com>,
        Hao Luo <haoluo@...gle.com>, Jiri Olsa <jolsa@...nel.org>,
        "Jason A. Donenfeld" <Jason@...c4.com>,
        Kumar Kartikeya Dwivedi <memxor@...il.com>,
        Delyan Kratunov <delyank@...com>,
        Ilya Leoshkevich <iii@...ux.ibm.com>,
        Menglong Dong <imagedong@...cent.com>,
        Yafang Shao <laoar.shao@...il.com>, bpf@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH 1/2] bpf: hide unused bpf_patch_call_args

From: Arnd Bergmann <arnd@...db.de>

This function has no callers and no declaration when CONFIG_BPF_JIT_ALWAYS_ON
is enabled:

kernel/bpf/core.c:2075:6: error: no previous prototype for 'bpf_patch_call_args' [-Werror=missing-prototypes]

Hide the definition as well.

Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
 kernel/bpf/core.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/kernel/bpf/core.c b/kernel/bpf/core.c
index 7421487422d4..6f5ede31e471 100644
--- a/kernel/bpf/core.c
+++ b/kernel/bpf/core.c
@@ -2064,7 +2064,7 @@ EVAL4(PROG_NAME_LIST, 416, 448, 480, 512)
 };
 #undef PROG_NAME_LIST
 #define PROG_NAME_LIST(stack_size) PROG_NAME_ARGS(stack_size),
-static u64 (*interpreters_args[])(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5,
+static __maybe_unused u64 (*interpreters_args[])(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5,
 				  const struct bpf_insn *insn) = {
 EVAL6(PROG_NAME_LIST, 32, 64, 96, 128, 160, 192)
 EVAL6(PROG_NAME_LIST, 224, 256, 288, 320, 352, 384)
@@ -2072,6 +2072,7 @@ EVAL4(PROG_NAME_LIST, 416, 448, 480, 512)
 };
 #undef PROG_NAME_LIST
 
+#ifdef CONFIG_BPF_SYSCALL
 void bpf_patch_call_args(struct bpf_insn *insn, u32 stack_depth)
 {
 	stack_depth = max_t(u32, stack_depth, 1);
@@ -2080,6 +2081,7 @@ void bpf_patch_call_args(struct bpf_insn *insn, u32 stack_depth)
 		__bpf_call_base_args;
 	insn->code = BPF_JMP | BPF_CALL_ARGS;
 }
+#endif
 
 #else
 static unsigned int __bpf_prog_ret0_warn(const void *ctx,
-- 
2.39.2