linux-kernel - Re: bug list: assigning negative values to unsigned variables

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Message-ID: <1264590586.9749.2.camel@localhost>
Date:	Wed, 27 Jan 2010 12:09:46 +0100
From:	Bernd Petrovitsch <bernd@...rovitsch.priv.at>
To:	Julia Lawall <julia@...u.dk>
Cc:	Dan Carpenter <error27@...il.com>, kernel-janitors@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: bug list: assigning negative values to unsigned variables

On Mit, 2010-01-27 at 11:57 +0100, Julia Lawall wrote:
> On Wed, 27 Jan 2010, Dan Carpenter wrote:
> 
> > Fixing the places which assign negative values to unsigned variables is a good janitor task.
> 
> I had the impression that assignment to -1 was done sometimes as a 
> portable way to initialize the variable to 0xffff (for any number of f's).  
> So perhaps it is not so trivial to fix.
Any particular reason that ~0U, ~0UL, and ~0ULL shouldn't do the same
(without relying on conversion from signed to unsigned)?

	Bernd
-- 
Bernd Petrovitsch                  Email : bernd@...rovitsch.priv.at
                     LUGA : http://www.luga.at

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