Re: [PATCH 5/5] writeback: IO-less balance_dirty_pages()

[Wu Fengguang]

> > +             bw = (u64)base_bw * bw >> BANDWIDTH_CALC_SHIFT;
> > +             pause = (HZ * pages_dirtied + bw / 2) / (bw | 1);
> > +             pause = min(pause, MAX_PAUSE);
> 
> Fix this build warning:
> 
>  mm/page-writeback.c: In function âbalance_dirty_pagesâ:
>  mm/page-writeback.c:889:11: warning: comparison of distinct pointer types lacks a cast

Thanks! I'll fix it by changing `pause' to "long", since we'll have
negative pause time anyway when considering think time compensation.

Thanks,
Fengguang
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