linux-kernel - Re: [v2] coccinelle: semantic code search for missing of_node

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Message-ID: <5b75be65-a205-ecd6-8424-e0b3384b21b1@web.de>
Date:   Sat, 29 Jun 2019 10:35:56 +0200
From:   Markus Elfring <Markus.Elfring@....de>
To:     Julia Lawall <julia.lawall@...6.fr>, cocci@...teme.lip6.fr
Cc:     Wen Yang <wen.yang99@....com.cn>, linux-kernel@...r.kernel.org,
        Yi Wang <wang.yi59@....com.cn>,
        Gilles Muller <Gilles.Muller@...6.fr>,
        Nicolas Palix <nicolas.palix@...g.fr>,
        Michal Marek <michal.lkml@...kovi.net>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>
Subject: Re: [v2] coccinelle: semantic code search for missing of_node_put

>>>> +if (x == NULL || ...) S
>>>> +... when != e = (T)x
>>>> +    when != true x == NULL
…
> I assume that it was added because it was found to be useful.

We can get different software development opinions also on
this implementation detail.

> Please actually try things out before declaring them to be useless.

Further clarification of desirable software behaviour will help.
I dare to express doubts around the SmPL functionality “when != true x == NULL”.

Would any more contributors like to share additional insights for the safer
application of the semantic patch language?

Is a reassignment of such local variable an usual precondition for
the discussed programming concern?

Regards,
Markus