[PATCH] bpf: hide do_bpf_send_signal when unused

[Arnd Bergmann]

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 <a...@arndb.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