linux-kernel - Re: cocci script to convert linux-kernel allocs with BITS_TO_LONGS to bitmap

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Date:   Sat, 10 Jul 2021 21:50:04 +0200 (CEST)
From:   Julia Lawall <julia.lawall@...ia.fr>
To:     Joe Perches <joe@...ches.com>
cc:     cocci <cocci@...teme.lip6.fr>, LKML <linux-kernel@...r.kernel.org>,
        kernel-janitors@...r.kernel.org
Subject: Re: cocci script to convert linux-kernel allocs with BITS_TO_LONGS
 to bitmap_alloc



On Fri, 9 Jul 2021, Joe Perches wrote:

> Here is a cocci script to convert various types of bitmap allocations
> that use BITS_TO_LONGS to the more typical bitmap_alloc functions.
>
> Perhaps something like it could be added to scripts/coccinelle.
> The diff produced by the script is also below.
>
> $ cat bitmap_allocs.cocci
> // typical uses of bitmap allocations
>
> @@
> expression val;
> expression e1;
> expression e2;
> @@
>
> -	val = kcalloc(BITS_TO_LONGS(e1), sizeof(\(long\|unsigned long\)), e2)
> +	val = bitmap_zalloc(e1, e2)
>
> @@
> expression val;
> expression e1;
> expression e2;
> @@
>
> -	val = kcalloc(BITS_TO_LONGS(e1), sizeof(*val), e2)
> +	val = bitmap_zalloc(e1, e2)

Is there something that guarantees that val has a type that has a size that
is the same as a long?

julia