linux-kernel - Re: [PATCH 1/5] lguest host feedback tidyups

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Message-ID: <20070513184750.GA4095@ftp.linux.org.uk>
Date:	Sun, 13 May 2007 19:47:50 +0100
From:	Al Viro <viro@....linux.org.uk>
To:	Rusty Russell <rusty@...tcorp.com.au>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	lkml - Kernel Mailing List <linux-kernel@...r.kernel.org>,
	virtualization <virtualization@...ts.linux-foundation.org>,
	hch <hch@...radead.org>
Subject: Re: [PATCH 1/5] lguest host feedback tidyups

On Sun, May 13, 2007 at 02:07:25PM +1000, Rusty Russell wrote:
> Most importantly, I now realize that Christoph's incorrect ranting
> about lgread_u32 et al was in fact a subtle ploy to make me diagnose
> the real issue: sparse 0.3 complains about casting a __user pointer
> to/from u32, but not an "unsigned long".  They are (currently)
> equivalent for lguest, but this is a much better solution than __force.

The real fix would be to declare it with u32 __user * as argument and deal
with callers.
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