linux-kernel - Re: [PATCH v6] coccinelle: semantic code search for missing put

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Date:   Sun, 17 Feb 2019 12:42:59 +0100
From:   Markus Elfring <Markus.Elfring@....de>
To:     Julia Lawall <julia.lawall@...6.fr>,
        Wen Yang <yellowriver2010@...mail.com>
Cc:     Gilles Muller <Gilles.Muller@...6.fr>,
        Nicolas Palix <nicolas.palix@...g.fr>,
        Michal Marek <michal.lkml@...kovi.net>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Wen Yang <wen.yang99@....com.cn>,
        Cheng Shengyu <cheng.shengyu@....com.cn>,
        kernel-janitors@...r.kernel.org,
        LKML <linux-kernel@...r.kernel.org>,
        Coccinelle <cocci@...teme.lip6.fr>
Subject: Re: [PATCH v6] coccinelle: semantic code search for missing
 put_device()

>>> +@...rch exists@
>>> +local idexpression id;
>>> +expression x,e,e1;
>>> +position p1,p2;
>>> +type T,T1,T2;
>>> +@@
>>> +
>>> +id = of_find_device_by_node@p1(x)
>>> +... when != e = id
>>
>> I suggest to increase your software development attention also for
>> another implementation detail.
>> Source code analysis triggers challenges for safe data flow handling.
>> the semantic patch language supports search specifications for
>> the exclusion of specific assignments.
>>
>> Does this SmPL code contain a questionable order for the source
>> and target metavariables?
>> Can the following variant be more appropriate?
>>
>> + ... when != id = e
>
> This is possible, but I think unlikely.

Would you dare to interpret my update suggestion (reordering of two identifiers)
as a required SmPL script correction?

Regards,
Markus