linux-kernel - Re: [PATCH] ptrdiff_t is not uintptr

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Message-ID: <20070820005246.GX21089@ftp.linux.org.uk>
Date:	Mon, 20 Aug 2007 01:52:46 +0100
From:	Al Viro <viro@....linux.org.uk>
To:	Anton Altaparmakov <aia21@....ac.uk>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	dbrownell@...rs.sourceforge.net, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ptrdiff_t is not uintptr_t, damnit

On Mon, Aug 20, 2007 at 01:27:13AM +0100, Anton Altaparmakov wrote:

> And what the cast was doing I can't remember.  I may well have just  
> copied it from the VFS or I was perhaps trying to silence a warning  
> and this happened to work...

... due to sparse bug (it miscalculated address space of pointed to,
picking top-level qualifiers for some reason; __user pointer to char
and pointer to __user char gave the same result and so did __user long).
That cast still made no sense...
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