linux-kernel - Re: [PATCH v2] coccinelle: misc: add excluded

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Date:   Mon, 21 Sep 2020 19:47:02 +0200 (CEST)
From:   Julia Lawall <julia.lawall@...ia.fr>
To:     Denis Efremov <efremov@...ux.com>
cc:     cocci@...teme.lip6.fr, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] coccinelle: misc: add excluded_middle.cocci script



On Mon, 21 Sep 2020, Denis Efremov wrote:

> Check for !A || A && B condition. It's equivalent to !A || B.
>
> Signed-off-by: Denis Efremov <efremov@...ux.com>

Applied, thanks.

> ---
> Changes in v2:
>  - spelling mistake fixed
>  - position variable moved on the && operator
>  - patch pattern changed to - (A && B)
>  - word "condition" removed from warning message
>
>  scripts/coccinelle/misc/excluded_middle.cocci | 39 +++++++++++++++++++
>  1 file changed, 39 insertions(+)
>  create mode 100644 scripts/coccinelle/misc/excluded_middle.cocci
>
> diff --git a/scripts/coccinelle/misc/excluded_middle.cocci b/scripts/coccinelle/misc/excluded_middle.cocci
> new file mode 100644
> index 000000000000..ab28393e4843
> --- /dev/null
> +++ b/scripts/coccinelle/misc/excluded_middle.cocci
> @@ -0,0 +1,39 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +///
> +/// Condition !A || A && B is equivalent to !A || B.
> +///
> +// Confidence: High
> +// Copyright: (C) 2020 Denis Efremov ISPRAS
> +// Options: --no-includes --include-headers
> +
> +virtual patch
> +virtual context
> +virtual org
> +virtual report
> +
> +@r depends on !patch@
> +expression A, B;
> +position p;
> +@@
> +
> +* !A || (A &&@p B)
> +
> +@...ends on patch@
> +expression A, B;
> +@@
> +
> +  !A ||
> +-       (A && B)
> ++       B
> +
> +@...ipt:python depends on report@
> +p << r.p;
> +@@
> +
> +coccilib.report.print_report(p[0], "WARNING !A || A && B is equivalent to !A || B")
> +
> +@...ipt:python depends on org@
> +p << r.p;
> +@@
> +
> +coccilib.org.print_todo(p[0], "WARNING !A || A && B is equivalent to !A || B")
> --
> 2.26.2
>
>