linux-kernel - Re: [PATCH 45/49] ACPI: replace nodes__weight with nodes_weight

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Date:   Mon, 14 Feb 2022 20:18:27 +0100
From:   "Rafael J. Wysocki" <rafael@...nel.org>
To:     Yury Norov <yury.norov@...il.com>
Cc:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Rasmus Villemoes <linux@...musvillemoes.dk>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Michał Mirosław <mirq-linux@...e.qmqm.pl>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Peter Zijlstra <peterz@...radead.org>,
        David Laight <David.Laight@...lab.com>,
        Joe Perches <joe@...ches.com>, Dennis Zhou <dennis@...nel.org>,
        Emil Renner Berthing <kernel@...il.dk>,
        Nicholas Piggin <npiggin@...il.com>,
        Matti Vaittinen <matti.vaittinen@...rohmeurope.com>,
        Alexey Klimov <aklimov@...hat.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Len Brown <lenb@...nel.org>,
        Dan Williams <dan.j.williams@...el.com>,
        Huacai Chen <chenhuacai@...nel.org>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Alison Schofield <alison.schofield@...el.com>,
        ACPI Devel Maling List <linux-acpi@...r.kernel.org>
Subject: Re: [PATCH 45/49] ACPI: replace nodes__weight with nodes_weight_ge
 for numa

On Fri, Feb 11, 2022 at 1:31 AM Yury Norov <yury.norov@...il.com> wrote:
>
> acpi_map_pxm_to_node() calls nodes_weight() to compare the weight
> of nodemask with a given number. We can do it more efficiently with
> nodes_weight_eq() because conditional nodes_weight may stop
> traversing the nodemask earlier, as soon as condition is (or is not)
> met.
>
> Signed-off-by: Yury Norov <yury.norov@...il.com>
> ---
>  drivers/acpi/numa/srat.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/acpi/numa/srat.c b/drivers/acpi/numa/srat.c
> index 3b818ab186be..fe7a7996f553 100644
> --- a/drivers/acpi/numa/srat.c
> +++ b/drivers/acpi/numa/srat.c
> @@ -67,7 +67,7 @@ int acpi_map_pxm_to_node(int pxm)
>         node = pxm_to_node_map[pxm];
>
>         if (node == NUMA_NO_NODE) {
> -               if (nodes_weight(nodes_found_map) >= MAX_NUMNODES)
> +               if (nodes_weight_ge(nodes_found_map, MAX_NUMNODES))
>                         return NUMA_NO_NODE;
>                 node = first_unset_node(nodes_found_map);
>                 __acpi_map_pxm_to_node(pxm, node);
> --

Applied as 5.18 material, thanks!