Re: [PATCH -tip] sched/cputime: do not scale when utime == 0

[Ingo Molnar]

* Stanislaw Gruszka <sgruszka@xxxxxxxxxx> wrote:

> scale_stime() silently assumes that stime < rtime, otherwise when
> stime == rtime and both values are big (operations on them do not fit
> in 32 bits), the resulting scaling stime can be bigger than rtime.
> In consequence utime = rtime - stime results in negative value.

Please also describe observed/expected symptoms of this bug in apps, so 
that we can later on redirect bugreporters to this fix and filter out new 
symptoms (if any).

Thanks,

	Ingo
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/