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

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Message-ID: <Pine.LNX.4.64.1001271329460.20256@ask.diku.dk>
Date:	Wed, 27 Jan 2010 13:30:20 +0100 (CET)
From:	Julia Lawall <julia@...u.dk>
To:	Bernd Petrovitsch <bernd@...rovitsch.priv.at>
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 Wed, 27 Jan 2010, Bernd Petrovitsch wrote:

> 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)?

Then the constant specifies the type?

julia
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