Re: [PATCH] sched: fix possible divide by zero in avg_atom calculation

On Sat, Jun 14, 2014 at 03:00:09PM +0200, Mateusz Guzik wrote: > proc_sched_show_task does: > if (nr_switches) > do_div(avg_atom, nr_switches); > > nr_switches is unsigned long and do_div truncates it to 32 bits, which > means it can test non-zero on e.g. x86-64 and be truncated to zero for

[PATCH] sched: fix possible divide by zero in avg_atom calculation

proc_sched_show_task does: if (nr_switches) do_div(avg_atom, nr_switches); nr_switches is unsigned long and do_div truncates it to 32 bits, which means it can test non-zero on e.g. x86-64 and be truncated to zero for division. Fix the problem by using div64_ul instead. As a side effect c