char: nwbutton: avoid unused variable warning

When CONFIG_NWBUTTON_REBOOT is disabled, we get a warning about
an unused variable:

drivers/char/nwbutton.c:37:12: warning: 'reboot_count' defined but not used [-Wunused-variable]
 static int reboot_count = NUM_PRESSES_REBOOT; /* Number of presses to reboot */

Using if(IS_ENABLED()) instead of #ifdef around the user makes the
code nicer to read and avoids the warning.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/char/nwbutton.c b/drivers/char/nwbutton.c
index 76c490f..0e18442 100644 (file)
--- a/drivers/char/nwbutton.c
+++ b/drivers/char/nwbutton.c
@@ -129,10 +129,9 @@ static void button_consume_callbacks (int bpcount)
 
 static void button_sequence_finished (unsigned long parameters)
 {
-#ifdef CONFIG_NWBUTTON_REBOOT          /* Reboot using button is enabled */
-       if (button_press_count == reboot_count)
+       if (IS_ENABLED(CONFIG_NWBUTTON_REBOOT) &&
+           button_press_count == reboot_count)
                kill_cad_pid(SIGINT, 1);        /* Ask init to reboot us */
-#endif /* CONFIG_NWBUTTON_REBOOT */
        button_consume_callbacks (button_press_count);
        bcount = sprintf (button_output_buffer, "%d\n", button_press_count);
        button_press_count = 0;         /* Reset the button press counter */