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

[Julia Lawall <julia.lawall@inria.fr>]

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