linux-kernel - Re: Process to push changes to include/linux/types.h

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Message-ID: <20101015142617.GB25620@basil.fritz.box>
Date:	Fri, 15 Oct 2010 16:26:17 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Andreas Gruenbacher <agruen@...e.de>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Andi Kleen <andi@...stfloor.org>,
	Jan Engelhardt <jengelh@...ozas.de>,
	Eric Paris <eparis@...hat.com>, linux-kernel@...r.kernel.org,
	torvalds@...ux-foundation.org, davem@...emloft.net
Subject: Re: Process to push changes to include/linux/types.h

> 64-bit values align to 4-byte boundaries on some 32-bit architectures like x86 
AFAIK it's only on x86, no other architecture made this mistake in their
32bit ABI. But of course x86 is kind of important ...

> and to 8-byte boundaries on 64-bit architetures.  The new __aligned_64 type 
> enforces 8-byte alignment and so structs containing __aligned_64 values have 
> the same alignment on 32-bit and 64-bit architectures.  No conversions are 
> necessary between 32-bit user-space and a 64-bit kernel.

Rest looks good and could be put into Andrew's comment.

-Andi

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