linux-kernel - Re: [PATCH 3/3] Coccinelle: pci_free_consistent: Extend when constraints for two SmPL ellipses

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Date:   Tue, 14 May 2019 21:50:52 +0200 (CEST)
From:   Julia Lawall <julia.lawall@...6.fr>
To:     Markus Elfring <Markus.Elfring@....de>
cc:     Gilles Muller <Gilles.Muller@...6.fr>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Michal Marek <michal.lkml@...kovi.net>,
        Nicolas Palix <nicolas.palix@...g.fr>,
        Wen Yang <wen.yang99@....com.cn>,
        Coccinelle <cocci@...teme.lip6.fr>,
        LKML <linux-kernel@...r.kernel.org>,
        Yi Wang <wang.yi59@....com.cn>
Subject: Re: [PATCH 3/3] Coccinelle: pci_free_consistent: Extend when
 constraints for two SmPL ellipses



On Tue, 14 May 2019, Markus Elfring wrote:

> From: Markus Elfring <elfring@...rs.sourceforge.net>
> Date: Tue, 14 May 2019 18:12:15 +0200
>
> A SmPL ellipsis was specified for a search approach so that additional
> source code would be tolerated between an assignment to a local variable
> and the corresponding null pointer check.
>
> But such code should be restricted.
> * The local variable must not be reassigned there.
> * It must also not be forwarded to an other assignment target.
>
> Take additional casts for these code exclusion specifications into account
> together with optional parentheses.

I leave this up to the ZTE people.

julia


>
> Fixes: f7b167113753e95ae61383e234f8d10142782ace ("scripts: Coccinelle script for pci_free_consistent()")
> Signed-off-by: Markus Elfring <elfring@...rs.sourceforge.net>
> ---
>  scripts/coccinelle/free/pci_free_consistent.cocci | 6 ++++--
>  1 file changed, 4 insertions(+), 2 deletions(-)
>
> diff --git a/scripts/coccinelle/free/pci_free_consistent.cocci b/scripts/coccinelle/free/pci_free_consistent.cocci
> index 45bc14ece151..48a36adfa3ce 100644
> --- a/scripts/coccinelle/free/pci_free_consistent.cocci
> +++ b/scripts/coccinelle/free/pci_free_consistent.cocci
> @@ -13,13 +13,15 @@ virtual org
>  local idexpression id;
>  expression x,y,z,e;
>  position p1,p2;
> -type T;
> +type T,T2,T3,T4;
>  @@
>
>  id = pci_alloc_consistent@p1(x,y,&z)
> -... when != e = id
> + ... when != id = (T2)(e)
> +     when != e = (T3)(id)
>  if (id == NULL || ...) { ... return ...; }
>  ... when != pci_free_consistent(x,y,id,z)
> +    when != id = (T4)(e)
>      when != if (id) { ... pci_free_consistent(x,y,id,z) ... }
>      when != if (y) { ... pci_free_consistent(x,y,id,z) ... }
>      when != e = (T)id
> --
> 2.21.0
>
>