linux-kernel - Re: [PATCH v2 03/44] Add CONFIG_HAVE_64BIT_ALIGNED

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Date:	Fri, 07 Dec 2012 19:43:13 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	James Hogan <james.hogan@...tec.com>
CC:	linux-arch@...r.kernel.org, linux-kernel@...r.kernel.org,
	Arnd Bergmann <arnd@...db.de>,
	Balbir Singh <bsingharora@...il.com>,
	Ingo Molnar <mingo@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Eric Paris <eparis@...hat.com>, Will Drewry <wad@...omium.org>,
	James Morris <james.l.morris@...cle.com>
Subject: Re: [PATCH v2 03/44] Add CONFIG_HAVE_64BIT_ALIGNED_STRUCT for taskstats

On 12/05/2012 08:08 AM, James Hogan wrote:
> On 64 bit architectures with no efficient unaligned access, taskstats
> has to add some padding to a reply to prevent unaligned access warnings.
> However this also needs to apply to 32 bit architectures with 64 bit
> struct alignment such as metag (which has 64 bit memory accesses).

Wait... 64-bit struct alignment on structures with only 32-bit members? 
  That might be... interesting... in a number of places...

	-hpa

-- 
H. Peter Anvin, Intel Open Source Technology Center
I work for Intel.  I don't speak on their behalf.

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