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Re: [XEN PATCH][for-4.19 1/9] xen/include: add macro LOWEST_POW2
- To: Nicola Vetrini <nicola.vetrini@xxxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- From: andrew.cooper3@xxxxxxxxxx
- Date: Fri, 6 Oct 2023 17:35:51 +0100
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- Cc: sstabellini@xxxxxxxxxx, michal.orzel@xxxxxxx, xenia.ragiadakou@xxxxxxx, ayan.kumar.halder@xxxxxxx, consulting@xxxxxxxxxxx, jbeulich@xxxxxxxx, roger.pau@xxxxxxxxxx, Simone Ballarin <simone.ballarin@xxxxxxxxxxx>, Doug Goldstein <cardoe@xxxxxxxxxx>, George Dunlap <george.dunlap@xxxxxxxxxx>, Julien Grall <julien@xxxxxxx>, Wei Liu <wl@xxxxxxx>
- Delivery-date: Fri, 06 Oct 2023 16:36:04 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 06/10/2023 9:26 am, Nicola Vetrini wrote:
> diff --git a/xen/include/xen/macros.h b/xen/include/xen/macros.h
> index d0caae7db298..bb9a1c9a53d0 100644
> --- a/xen/include/xen/macros.h
> +++ b/xen/include/xen/macros.h
> @@ -8,8 +8,10 @@
> #define DIV_ROUND(n, d) (((n) + (d) / 2) / (d))
> #define DIV_ROUND_UP(n, d) (((n) + (d) - 1) / (d))
>
> -#define MASK_EXTR(v, m) (((v) & (m)) / ((m) & -(m)))
> -#define MASK_INSR(v, m) (((v) * ((m) & -(m))) & (m))
> +#define LOWEST_POW2(x) ((x) & -(x))
Naming wise, LOWEST_BIT() please.
The fact it's a power of two is incidental, and POW2 is ambiguous,
because it includes interpretations such as "calculate the lowest power
of two greater than x".
~Andrew
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