linux-kernel - Re: [PATCH] Introduce compat_u64 and compat

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Message-Id: <20070615.025522.36921451.davem@davemloft.net>
Date:	Fri, 15 Jun 2007 02:55:22 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	arnd@...db.de
Cc:	benh@...nel.crashing.org, dwmw2@...radead.org,
	linux-kernel@...r.kernel.org, airlied@...ux.ie,
	linux-arch@...r.kernel.org, akpm@...ux-foundation.org
Subject: Re: [PATCH] Introduce compat_u64 and compat_s64 types

From: Arnd Bergmann <arnd@...db.de>
Date: Fri, 15 Jun 2007 11:31:37 +0200

> One common problem with 32 bit system call and ioctl emulation
> is the different alignment rules between i386 and 64 bit machines.
> A number of drivers work around this by marking the compat
> structures as 'attribute((packed))', which is not the right
> solution because it breaks all the non-x86 architectures that
> want to use the same compat code.
> 
> Hopefully, this patch improves the situation, it introduces two
> new types, compat_u64 and compat_s64. These are defined on all
> architectures to have the same size and alignment as the 32 bit
> version of u64 and s64.
> 
> Signed-off-by: Arnd Bergmann <arnd@...db.de>

Acked-by: David S. Miller <davem@...emloft.net>
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