Hi Peter, On Wed, Jul 15, 2020 at 10:38:00AM +0200, Peter Zijlstra wrote: > On Wed, Jul 15, 2020 at 10:05:08AM +0800, Leo Yan wrote: > > > [leoyan: Use quot/rem to convert cyc to ns to avoid overflow] > > > + quot = rd->epoch_cyc >> rd->shift; > > + rem = rd->epoch_cyc & (((u64)1 << rd->shift) - 1); > > + ns = quot * rd->mult + ((rem * rd->mult) >> rd->shift); > > + userpg->time_zero -= ns; > > I think we have mul_u64_u32_shr() for that.
Will fix it in next spin. Thanks for suggestion, Leo
