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Message-Id: <20221103150303.974028-1-rabenstein@cs.fau.de>
Date: Thu, 3 Nov 2022 16:03:03 +0100
From: Jonas Rabenstein <rabenstein@...fau.de>
To: Jiri Olsa <jolsa@...nel.org>
Cc: Jonas Rabenstein <rabenstein@...fau.de>,
Song Liu <song@...nel.org>,
Alexei Starovoitov <ast@...nel.org>,
Daniel Borkmann <daniel@...earbox.net>,
Andrii Nakryiko <andrii@...nel.org>,
Martin KaFai Lau <martin.lau@...ux.dev>,
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>,
Steven Rostedt <rostedt@...dmis.org>,
Masami Hiramatsu <mhiramat@...nel.org>, bpf@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: [PATCH] bpf: mark get_entry_ip as __maybe_unused
Commit c09eb2e578eb1668bbc ("bpf: Adjust kprobe_multi entry_ip
for CONFIG_X86_KERNEL_IBT") introduced the get_entry_ip() function.
Depending on CONFIG_X86_KERNEL_IBT it is a static function or only
a macro definition. The only user of this symbol so far is in
kprobe_multi_link_handler() if CONFIG_FPROBE is enabled.
If CONFIG_FROBE is not set, the symbol is not used and - depending
on CONFIG_X86_KERNEL_IBT - a warning for get_entry_ip() is emitted.
To solve this, the function should be marked as __maybe_unused.
Signed-off-by: Jonas Rabenstein <rabenstein@...fau.de>
---
kernel/trace/bpf_trace.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/kernel/trace/bpf_trace.c b/kernel/trace/bpf_trace.c
index f2d8d070d024..19131aae0bc3 100644
--- a/kernel/trace/bpf_trace.c
+++ b/kernel/trace/bpf_trace.c
@@ -1032,7 +1032,7 @@ static const struct bpf_func_proto bpf_get_func_ip_proto_tracing = {
};
#ifdef CONFIG_X86_KERNEL_IBT
-static unsigned long get_entry_ip(unsigned long fentry_ip)
+static unsigned long __maybe_unused get_entry_ip(unsigned long fentry_ip)
{
u32 instr;
--
2.37.4
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