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Re: [Xen-devel] [PATCH 1/2] xen: introduce a cpumask with all bits set
- To: Juergen Gross <jgross@xxxxxxxx>, <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- Date: Thu, 14 Mar 2019 10:04:36 +0000
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- Cc: Stefano Stabellini <sstabellini@xxxxxxxxxx>, Wei Liu <wei.liu2@xxxxxxxxxx>, Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>, George Dunlap <George.Dunlap@xxxxxxxxxxxxx>, Tim Deegan <tim@xxxxxxx>, Ian Jackson <ian.jackson@xxxxxxxxxxxxx>, Dario Faggioli <dfaggioli@xxxxxxxx>, Julien Grall <julien.grall@xxxxxxx>, Jan Beulich <jbeulich@xxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>
- Delivery-date: Thu, 14 Mar 2019 10:05:00 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
- Openpgp: preference=signencrypt
On 14/03/2019 09:59, Juergen Gross wrote:
> There are several places in Xen allocating a cpumask on the stack and
> setting all bits in it just to use it as an initial mask for allowing
> all cpus.
>
> Save the stack space and omit the need for runtime initialization by
> defining a globally accessible cpumask_all variable.
>
> Signed-off-by: Juergen Gross <jgross@xxxxxxxx>
Reviewed-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, with one minor
style suggestions which can be folded on commit.
> diff --git a/xen/arch/x86/io_apic.c b/xen/arch/x86/io_apic.c
> index daa5e9e5ff..a5344ed727 100644
> --- a/xen/arch/x86/io_apic.c
> +++ b/xen/arch/x86/io_apic.c
> @@ -1892,8 +1891,7 @@ static void __init check_timer(void)
> vector = IRQ0_VECTOR;
> clear_irq_vector(0);
>
> - cpumask_setall(&mask_all);
> - if ((ret = bind_irq_vector(0, vector, &mask_all)))
> + if ((ret = bind_irq_vector(0, vector, &cpumask_all)))
Spaces, seeing as we're modifying the line.
~Andrew
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