From: Andrzej Hajda <a.hajda@samsung.com>
To: Julia Lawall <julia.lawall@lip6.fr>
Cc: SF Markus Elfring <elfring@users.sourceforge.net>,
Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>,
Gilles Muller <Gilles.Muller@lip6.fr>,
Joe Perches <joe@perches.com>,
Nicolas Palix <nicolas.palix@imag.fr>,
Michal Marek <mmarek@suse.com>,
linux-kernel@vger.kernel.org, kernel-janitors@vger.kernel.org,
cocci@systeme.lip6.fr
Subject: Re: [PATCH] coccinelle: tests: unsigned value cannot be lesser than zero
Date: Wed, 16 Sep 2015 11:11:45 +0200 [thread overview]
Message-ID: <55F93251.4010706@samsung.com> (raw)
In-Reply-To: <alpine.DEB.2.10.1509151557040.2537@hadrien>
On 09/15/2015 03:57 PM, Julia Lawall wrote:
>
>
> On Tue, 15 Sep 2015, Andrzej Hajda wrote:
>
>> On 09/15/2015 03:31 PM, Julia Lawall wrote:
>>> 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?
>>
>> You are right, the 2nd case should be also addressed,
>> such code is misleading.
>> I will prepare then 2nd version of the patch.
>
> It could be reasonable to change the options to --all-includes? Although
> it could be somewhat slow.
I have tested the patch with 'v <= 0', it spotted hundreds places with this
check. It seems to be quite common practice to use such checks with counters,
iterators, quantities, range checking. In fact it is negation of 'v > 0' which
seems to be acceptable even if it really means 'v != 0'. So maybe we should not
warn about it? What do you think?
On the other side it spotted also real bugs, but maybe I can make separate, more
specific test for such cases.
Regards
Andrzej
>
> julia
>
>>
>> Regards
>> Andrzej
>>
>>>
>>> julia
>>>
>>>
>>>> Regards,
>>>> Markus
>>>> --
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>>>>
>>
>>
> --
> To unsubscribe from this list: send the line "unsubscribe kernel-janitors" in
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>
next prev parent reply other threads:[~2015-09-16 9:12 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-09-15 9:27 [PATCH] coccinelle: tests: unsigned value cannot be lesser than zero Andrzej Hajda
2015-09-15 13:01 ` SF Markus Elfring
2015-09-15 13:07 ` Julia Lawall
2015-09-15 13:16 ` SF Markus Elfring
2015-09-15 13:31 ` Julia Lawall
2015-09-15 13:51 ` Andrzej Hajda
2015-09-15 13:57 ` Julia Lawall
2015-09-16 9:11 ` Andrzej Hajda [this message]
2015-09-16 9:25 ` Julia Lawall
2015-09-16 13:22 ` [PATCH v2] " Andrzej Hajda
2015-09-16 13:33 ` Julia Lawall
2015-09-16 18:56 ` SF Markus Elfring
2015-09-15 13:42 ` [PATCH] " Andrzej Hajda
2015-09-15 14:36 ` SF Markus Elfring
2015-09-15 14:43 ` [Cocci] " Julia Lawall
2015-09-15 14:53 ` SF Markus Elfring
2015-09-18 5:35 ` Julia Lawall
2015-09-21 10:37 ` [PATCH v3] " Andrzej Hajda
2015-09-21 13:02 ` SF Markus Elfring
2015-09-21 13:34 ` Andrzej Hajda
2015-09-21 14:06 ` SF Markus Elfring
2015-09-22 15:27 ` SF Markus Elfring
2015-09-23 7:34 ` Andrzej Hajda
2015-09-23 15:17 ` SF Markus Elfring
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