From mboxrd@z Thu Jan 1 00:00:00 1970 From: eddie.huang@mediatek.com (Eddie Huang) Date: Sun, 17 May 2015 18:44:58 +0800 Subject: [PATCH] rtc: mt6397: fix build on some 32bits platforms In-Reply-To: <1431636678-29525-1-git-send-email-alexandre.belloni@free-electrons.com> References: <1431636678-29525-1-git-send-email-alexandre.belloni@free-electrons.com> Message-ID: <1431859498.31486.1.camel@mtksdaap41> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org On Thu, 2015-05-14 at 22:51 +0200, Alexandre Belloni wrote: > On some !ARM 32bits platforms, the following compilation error happens > because of the division on a 64bits value in mtk_rtc_read_time(): > > drivers/built-in.o: In function `mtk_rtc_read_time': > rtc-mt6397.c:(.text+0x265d13f): undefined reference to `__divdi3' > rtc-mt6397.c:(.text+0x265d150): undefined reference to `__moddi3' > > Use div_s64() as done in rtc_time64_to_tm() to solve that. > > Reported-by: kbuild test robot > Signed-off-by: Alexandre Belloni > --- > drivers/rtc/rtc-mt6397.c | 5 +++-- > 1 file changed, 3 insertions(+), 2 deletions(-) > > diff --git a/drivers/rtc/rtc-mt6397.c b/drivers/rtc/rtc-mt6397.c > index 8bed852e4961..c0090b698ff3 100644 > --- a/drivers/rtc/rtc-mt6397.c > +++ b/drivers/rtc/rtc-mt6397.c > @@ -150,7 +150,7 @@ static int mtk_rtc_read_time(struct device *dev, struct rtc_time *tm) > { > time64_t time; > struct mt6397_rtc *rtc = dev_get_drvdata(dev); > - int sec, ret; > + int days, sec, ret; > > do { > ret = __mtk_rtc_read_time(rtc, tm, &sec); > @@ -171,7 +171,8 @@ static int mtk_rtc_read_time(struct device *dev, struct rtc_time *tm) > /* rtc_tm_to_time64 covert Gregorian date to seconds since > * 01-01-1970 00:00:00, and this date is Thursday. > */ > - tm->tm_wday = (time / 86400 + 4) % 7; > + days = div_s64(time, 86400); > + tm->tm_wday = (days + 4) % 7; > > exit: > return ret; Acked-by: Eddie Huang