On Tue, Jul 26, 2011 at 12:09:40AM -0700, Linus Torvalds wrote:
> And it just looks unnecessarily complicated. Just a simple
>
> #define DIV_ROUND_UP_ULL(ll,d) \
> ({ unsigned long long _tmp = (ll)+(d)-1; do_div(_tmp, d); _tmp; })
>
> looks like it would work and be simpler. Avoid the conditional, do the
> same "add 'd-1' thing as the regular ROUND_UP().
>
> Untested. And not much thinking involved.
Overflow risk? Of course DIV_ROUND_UP has the same issue, and looks
slight easier to trigger, maybe.
OG.
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