linux-kernel - Re: [GIT PULL] Btrfs

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Date:	Fri, 13 Sep 2013 13:15:29 +0100
From:	Russell King <rmk@....linux.org.uk>
To:	Josh Boyer <jwboyer@...oraproject.org>
Cc:	Geert Uytterhoeven <geert@...ux-m68k.org>,
	Chris Mason <chris.mason@...ionio.com>,
	Mark Fasheh <mfasheh@...e.de>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-btrfs <linux-btrfs@...r.kernel.org>,
	"Linux-Kernel@...r. Kernel. Org" <linux-kernel@...r.kernel.org>,
	Linux-Arch <linux-arch@...r.kernel.org>
Subject: Re: [GIT PULL] Btrfs

On Fri, Sep 13, 2013 at 07:53:21AM -0400, Josh Boyer wrote:
> I'm not an ARM expert, so I don't know if ARM should use the
> asm-generic implementations, or just use __get_user/__put_user in all
> cases.  I've CC'd rmk.

Why do we have uaccess-unaligned.h ?  Normally, these kinds of things
are spawned by architectures which have problems with unaligned accesses,
ARM being one of them, but afaik we've never need this.

With the kernel-side trapping of unaligned accesses on older hardware,
we've always dealt with the normal accessor faulting.

>From what I can tell in the git history, these unaligned put_user and
get_user have existed all the way back to the dawn of git use.

Can someone enlighten me why we have them?

-- 
Russell King
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