linux-kernel - Re: Flaws with "UIO: Add the User IO core code" (with patch)

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Date:	Sat, 28 Apr 2007 23:08:51 +0200
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Hans-Jürgen Koch <hjk@...utronix.de>
Cc:	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Greg Kroah-Hartman <gregkh@...e.de>,
	linux-kernel@...r.kernel.org, torvalds@...l.org,
	Benedikt Spranger <b.spranger@...utronix.de>
Subject: Re: Flaws with "UIO: Add the User IO core code" (with patch)

On Sat, 2007-04-28 at 23:03 +0200, Hans-Jürgen Koch wrote:
> Am Samstag 28 April 2007 22:24 schrieb Alan Cox:
> > > > AFAIK we don't currently have any platform that runs binaries with
> > > > different sizes of "int" but this is a) an unsigned value anyway, and b)
> > > > should be a fixed type (eg u32)
> > > 
> > > I reviewed the code once more and find it OK. There is only one legal
> > > value for the parameter "count" of uio_read(), and that's sizeof(int).
> > 
> > If you are a box with multiple supported binary types how big is an
> > "int". We use explicit sizes to ensure that uio_read() will work when/if
> > we get platforms which support binaries with differing ideas of the size
> > of "int". Thus it should use s32 or s64 or similar.
> 
> Here's a fix to that effect:

Can you please add a matching paragraph to the documentation ?

	tglx


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