linux-kernel - Re: [PATCH] coccinelle: tests: unsigned value cannot be lesser than zero

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Date:	Tue, 15 Sep 2015 15:31:58 +0200 (CEST)
From:	Julia Lawall <julia.lawall@...6.fr>
To:	SF Markus Elfring <elfring@...rs.sourceforge.net>
cc:	Julia Lawall <julia.lawall@...6.fr>,
	Andrzej Hajda <a.hajda@...sung.com>,
	Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
	Gilles Muller <Gilles.Muller@...6.fr>,
	Joe Perches <joe@...ches.com>,
	Nicolas Palix <nicolas.palix@...g.fr>,
	Michal Marek <mmarek@...e.com>, linux-kernel@...r.kernel.org,
	kernel-janitors@...r.kernel.org, cocci@...teme.lip6.fr
Subject: Re: [PATCH] coccinelle: tests: unsigned value cannot be lesser than
 zero

On Tue, 15 Sep 2015, SF Markus Elfring wrote:

> >>  v@p
> >> (
> >> *< 0
> >> |
> >> *<= 0
> >> )
> >
> > It does not, and is not intended to, work.  The branches of a disjunction
> > should be complete expressions.
>
> Will the following SmPL approach be more appropriate then?
>
> (
> *v@p < 0
> |
> *v@p <= 0
> )

Actually, all of

v < 0 (never true)
v <= 0 (same as v == 0)
v >= 0 (always true)

would seem to merit attention.  Andrzej, what do you think?

julia


>
> Regards,
> Markus
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