linux-kernel - Re: [PATCH] types.h: define __aligned

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Message-ID: <20101015084311.GA25620@basil.fritz.box>
Date:	Fri, 15 Oct 2010 10:43:11 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Eric Paris <eparis@...hat.com>
Cc:	linux-kernel@...r.kernel.org, akpm@...ux-foundation.org,
	jengelh@...ozas.de, davem@...emloft.net, andi@...stfloor.org
Subject: Re: [PATCH] types.h: define __aligned_u64 and expose to userspace

On Fri, Oct 15, 2010 at 12:24:55AM -0400, Eric Paris wrote:
> We currently have a kernel internal type called aligned_u64 which aligns
> __u64's on 8 bytes boundaries even on systems which would normally align
> them on 4 byte boundaries.  This patch creates a new type __aligned_u64
> which does the same thing but which is exposed to userspace rather than
> being kernel internal.
> 
> Based-on-patch-by: Andreas Gruenbacher <agruen@...e.de>
> Signed-off-by: Eric Paris <eparis@...hat.com>

Acked-by: Andi Kleen <ak@...ux.intel.com>

but only if you:

> +/* this is a special 64bit data type that is 8-byte aligned */

Expand this comment a bit that that using this type as a 
replacement for u64 is recommended
for any user visible 64bit value in a structure and that it 
avoids problem with the compat layer on x86-64.

-Andi

-- 
ak@...ux.intel.com -- Speaking for myself only.
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