linux-kernel - Re: [PATCH 2/2] kernel: Move arches to use common unaligned access

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Message-Id: <20080411.031642.193716019.davem@davemloft.net>
Date:	Fri, 11 Apr 2008 03:16:42 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	dhowells@...hat.com
Cc:	harvey.harrison@...il.com, akpm@...ux-foundation.org,
	linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
	torvalds@...ux-foundation.org
Subject: Re: [PATCH 2/2] kernel: Move arches to use common unaligned access

From: David Howells <dhowells@...hat.com>
Date: Fri, 11 Apr 2008 11:11:28 +0100

> Harvey Harrison <harvey.harrison@...il.com> wrote:
> 
> > - * impractical.  So, now we fall back to using memcpy.
> > + * impractical.  So, now we fall back to using memmov.
> 
> That's memmove, not memmov.  Any why memmove, not memcpy?  Is __tmp likely to
> overlap with *ptr?

No, I think it has something to do with what cases GCC is allowed to
optimize the call inline and what cases it cannot wrt.  alignment of
datums.
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