Hi Alexandre,
On 25 December 2017 at 19:10, Baolin Wang <baolin.wang@xxxxxxxxxx> wrote:
> If we convert one large time values to rtc_time, in the original formula
> 'days * 86400' can be overflowed in 'unsigned int' type to make the formula
> get one incorrect remain seconds value. Thus we can use div_s64_rem()
> function to avoid this situation.
>
> Signed-off-by: Baolin Wang <baolin.wang@xxxxxxxxxx>
Could you apply this patch if there are no other comments? Thanks.
> ---
> drivers/rtc/rtc-lib.c | 6 ++----
> 1 file changed, 2 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/rtc/rtc-lib.c b/drivers/rtc/rtc-lib.c
> index 1ae7da5..ad5bb21 100644
> --- a/drivers/rtc/rtc-lib.c
> +++ b/drivers/rtc/rtc-lib.c
> @@ -52,13 +52,11 @@ int rtc_year_days(unsigned int day, unsigned int month, unsigned int year)
> */
> void rtc_time64_to_tm(time64_t time, struct rtc_time *tm)
> {
> - unsigned int month, year;
> - unsigned long secs;
> + unsigned int month, year, secs;
> int days;
>
> /* time must be positive */
> - days = div_s64(time, 86400);
> - secs = time - (unsigned int) days * 86400;
> + days = div_s64_rem(time, 86400, &secs);
>
> /* day of the week, 1970-01-01 was a Thursday */
> tm->tm_wday = (days + 4) % 7;
> --
> 1.7.9.5
>
--
Baolin.wang
Best Regards
