linux-kernel - Re: [PATCH 1/1] scripts/coccinelle: use BIT() macro if possible

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Date:	Sun, 27 Apr 2014 12:29:14 +0200 (CEST)
From:	Julia Lawall <julia.lawall@...6.fr>
To:	Javier Martinez Canillas <javier@...hile0.org>
cc:	Gilles Muller <Gilles.Muller@...6.fr>,
	Nicolas Palix <nicolas.palix@...g.fr>,
	Michal Marek <mmarek@...e.cz>, cocci@...teme.lip6.fr,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/1] scripts/coccinelle: use BIT() macro if possible



On Sun, 27 Apr 2014, Javier Martinez Canillas wrote:

> Using the BIT() macro instead of manually shifting bits
> makes the code less error prone and also more readable.
> 
> Signed-off-by: Javier Martinez Canillas <javier@...hile0.org>
> ---
> 
> An example of the patches that can be obtained with this spatch:
> 
> http://www.mail-archive.com/linux-gpio@vger.kernel.org/msg02722.html
> 
>  scripts/coccinelle/api/bit.cocci | 25 +++++++++++++++++++++++++
>  1 file changed, 25 insertions(+)
>  create mode 100644 scripts/coccinelle/api/bit.cocci
> 
> diff --git a/scripts/coccinelle/api/bit.cocci b/scripts/coccinelle/api/bit.cocci
> new file mode 100644
> index 0000000..a5df73a
> --- /dev/null
> +++ b/scripts/coccinelle/api/bit.cocci
> @@ -0,0 +1,25 @@
> +// Use the macro BIT() macro if possible
> +//
> +// Confidence: High
> +// Copyright (C) 2014 Javier Martinez Canillas.  GPLv2.
> +// URL: http://coccinelle.lip6.fr/
> +// Options: --include-headers
> +
> +@...bitops@
> +@@
> +
> +#include <linux/bitops.h>

Here you could say:

@usesbit@
@@
BIT(...)


> +@...ends on hasbitops@

and then here it would be

@depends on hasbitops && usesbit@

julia

> +expression E;
> +@@
> +
> +- 1 << E
> ++ BIT(E)
> +
> +@...ends on hasbitops@
> +expression E;
> +@@
> +
> +- BIT((E))
> ++ BIT(E)
> -- 
> 1.9.1
> 
> 
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