Re: [RFC 1/1 linux-next] btrfs: don't opencode zero_user_segment

[Zach Brown]

On Tue, Oct 14, 2014 at 10:18:09PM +0200, Fabian Frederick wrote:
> 
> 
> > On 14 October 2014 at 21:15 Zach Brown <zab@xxxxxxxxx> wrote:
> >
> >
> > On Tue, Oct 14, 2014 at 07:46:14PM +0200, Fabian Frederick wrote:
> > > use function defined in include/linux/highmem.h
> > > Note that this reverts 2 last function call order
> >
> > And adds a BUG_ON(PAGE_CACHE_SIZE > PAGE_SIZE).  We can take bets on
> > whether that will ever trigger.
> 
> There are 36 zero_user_segment with PAGE_CACHE_SIZE callsites.
> Maybe we could add some specific function to avoid BUG_ON tests ?

Nah, I wouldn't bother.

A lot of us have long rolled our eyes at the distinction between
PAGE_SIZE and PAGE_CACHE_SIZE given how much will break if they're ever
actually different.  That's what I was referencing there :).

- z 
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