From 2c4c2a71bd6f75c3982ac09407889b110673ac83 Mon Sep 17 00:00:00 2001
From: Randy Dunlap <rdunlap@infradead.org>
Date: Sat, 7 Jul 2018 08:25:01 -0700
Subject: [PATCH] ACPI / button: fix defined but not used warning

Fix a build warning in the ACPI button driver when CONFIG_PROC_FS
is not enabled by marking the unused function as __maybe_unused.

../drivers/acpi/button.c:252:12: warning: 'acpi_button_state_seq_show' defined but not used [-Wunused-function]

Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
---
 drivers/acpi/button.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/acpi/button.c b/drivers/acpi/button.c
index 40ed3ec9fc94..a19ff3977ac4 100644
--- a/drivers/acpi/button.c
+++ b/drivers/acpi/button.c
@@ -21,6 +21,7 @@
 
 #define pr_fmt(fmt) "ACPI: button: " fmt
 
+#include <linux/compiler.h>
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/init.h>
@@ -249,7 +250,8 @@ static int acpi_lid_notify_state(struct acpi_device *device, int state)
 	return ret;
 }
 
-static int acpi_button_state_seq_show(struct seq_file *seq, void *offset)
+static int __maybe_unused acpi_button_state_seq_show(struct seq_file *seq,
+						     void *offset)
 {
 	struct acpi_device *device = seq->private;
 	int state;
-- 
2.39.5