The clang build fails with rtc-rzn1.c:291:3: error: variable 'val' is uninitialized when used here [-Werror,-Wuninitialized] val |= RZN1_RTC_SUBU_DEV; ^~~ The val variable in rzn1_rtc_set_offset() is never initialized so the series of |= operations in the function will start with a garbage value. So initialize val to 0. Fixes: be4a11cf98af ("rtc: rzn1: Add oscillator offset support") Signed-off-by: Tom Rix <trix@xxxxxxxxxx> --- drivers/rtc/rtc-rzn1.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/rtc/rtc-rzn1.c b/drivers/rtc/rtc-rzn1.c index 980ade8c9601..0b4bf6e43464 100644 --- a/drivers/rtc/rtc-rzn1.c +++ b/drivers/rtc/rtc-rzn1.c @@ -272,7 +272,7 @@ static int rzn1_rtc_set_offset(struct device *dev, long offset) struct rzn1_rtc *rtc = dev_get_drvdata(dev); unsigned int steps; int stepsh, stepsl; - u32 val; + u32 val = 0; int ret; /* -- 2.27.0