netdev - [PATCH] bpf: hide do_bpf_send

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Date:   Mon, 17 Jun 2019 14:57:07 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     Steven Rostedt <rostedt@...dmis.org>,
        Ingo Molnar <mingo@...hat.com>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>
Cc:     Arnd Bergmann <arnd@...db.de>, Andrii Nakryiko <andriin@...com>,
        Yonghong Song <yhs@...com>, Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>,
        Matt Mullins <mmullins@...com>, netdev@...r.kernel.org,
        bpf@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] bpf: hide do_bpf_send_signal when unused

When CONFIG_MODULES is disabled, this function is never called:

kernel/trace/bpf_trace.c:581:13: error: 'do_bpf_send_signal' defined but not used [-Werror=unused-function]

Add another #ifdef around it.

Fixes: 8b401f9ed244 ("bpf: implement bpf_send_signal() helper")
Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
 kernel/trace/bpf_trace.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/kernel/trace/bpf_trace.c b/kernel/trace/bpf_trace.c
index c102c240bb0b..b1a814e2d451 100644
--- a/kernel/trace/bpf_trace.c
+++ b/kernel/trace/bpf_trace.c
@@ -602,6 +602,7 @@ struct send_signal_irq_work {
 
 static DEFINE_PER_CPU(struct send_signal_irq_work, send_signal_work);
 
+#ifdef CONFIG_MODULES
 static void do_bpf_send_signal(struct irq_work *entry)
 {
 	struct send_signal_irq_work *work;
@@ -609,6 +610,7 @@ static void do_bpf_send_signal(struct irq_work *entry)
 	work = container_of(entry, struct send_signal_irq_work, irq_work);
 	group_send_sig_info(work->sig, SEND_SIG_PRIV, work->task, PIDTYPE_TGID);
 }
+#endif
 
 BPF_CALL_1(bpf_send_signal, u32, sig)
 {
-- 
2.20.0