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

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Message-ID: <468850260.110326.1413317889395.open-xchange@webmail.nmp.skynet.be>
Date:	Tue, 14 Oct 2014 22:18:09 +0200 (CEST)
From:	Fabian Frederick <fabf@...net.be>
To:	Zach Brown <zab@...bo.net>
Cc:	Josef Bacik <jbacik@...com>, linux-kernel@...r.kernel.org,
	linux-btrfs@...r.kernel.org, Chris Mason <clm@...com>
Subject: Re: [RFC 1/1 linux-next] btrfs: don't opencode zero_user_segment



> On 14 October 2014 at 21:15 Zach Brown <zab@...bo.net> 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 ?

Fabian
>
> - z
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