Re: [PROBLEM] possible divide by 0 in kernel/sched/cputime.cscale_stime()

[Stanislaw Gruszka]

On Mon, Nov 18, 2013 at 06:27:06PM +0100, Peter Zijlstra wrote:
> The below is a compile tested only attempt to deal with both these
> problems. Comments?

Just two nits as I don't understand vast of the patch.

> +	delta_exec = now - curr->exec_start;
> +	if ((s64)delta_exec < 0)
>  		return;

Check here should probably use <= and also unlikely() would be
reasonable. 

> +	schedstat_set(curr->statistics.exec_max,
> +		      max((u64)delta_exec, curr->statistics.exec_max));

(u64) cast not needed.

Stanislaw
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