linux-kernel - Re: [PATCH] coccinelle: api: add kvfree script

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Date:   Sat, 6 Jun 2020 16:04:48 +0200
From:   Markus Elfring <Markus.Elfring@....de>
To:     Denis Efremov <efremov@...ux.com>,
        Coccinelle <cocci@...teme.lip6.fr>,
        Gilles Muller <Gilles.Muller@...6.fr>,
        Julia Lawall <julia.lawall@...6.fr>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Michal Marek <michal.lkml@...kovi.net>,
        Nicolas Palix <nicolas.palix@...g.fr>
Cc:     linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: Re: [PATCH] coccinelle: api: add kvfree script

> +@...ice@
> +expression E, E1;
> +position kok, vok;
> +@@
> +
> +(
> +  if (...) {
> +    ...
> +    E = \(kmalloc@kok\|…\)(...)

Further implementation details from this SmPL script caught my software
development attention.

* Is there a need to add the specification “when any” to the SmPL ellipses
  before such assignment statements?

* A limited search approach was expressed. Will additional source code variations
  become relevant?
  + switch statement
  + if branches with single statements
  + conditional operator


> +@...ortunity depends on !patch …@
…
> +  E = \(kmalloc\|…\)(..., size, ...)
> +  ... when != E = E1
> +      when != size = E1

I wonder that two assignments should be excluded here according to
the same expression metavariable.


+@...ree depends on patch exists@
…
+- \(kfree\|kvfree\)(E)
++ vfree(E)

Would you like to use a SmPL code variant like the following
at any more places?
(Is it occasionally helpful to increase the change precision?)

+-\(kfree\|kvfree\)
++vfree
+      (E)


Regards,
Markus