We get 1 warning when building kernel with W=1: drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_8192e.c:1557:6: warning: no previous prototype for 'rtl8192eu_power_off' [-Wmissing-prototypes] In fact, this function is only used in the file in which it is declared and don't need a declaration, but can be made static. so this patch marks this function with 'static'. Signed-off-by: Baoyou Xie <baoyou.xie@xxxxxxxxxx> --- drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_8192e.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_8192e.c b/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_8192e.c index df54d27..7b5128a 100644 --- a/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_8192e.c +++ b/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_8192e.c @@ -1554,7 +1554,7 @@ static int rtl8192eu_power_on(struct rtl8xxxu_priv *priv) return ret; } -void rtl8192eu_power_off(struct rtl8xxxu_priv *priv) +static void rtl8192eu_power_off(struct rtl8xxxu_priv *priv) { u8 val8; u16 val16; -- 2.7.4