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Re: [PATCH v2 2/2] xen: move per-cpu area management into common code
- To: Oleksii Kurochko <oleksii.kurochko@xxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Wed, 25 Sep 2024 17:12:27 +0200
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- Cc: Stefano Stabellini <sstabellini@xxxxxxxxxx>, Julien Grall <julien@xxxxxxx>, Bertrand Marquis <bertrand.marquis@xxxxxxx>, Michal Orzel <michal.orzel@xxxxxxx>, Volodymyr Babchuk <Volodymyr_Babchuk@xxxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Shawn Anastasio <sanastasio@xxxxxxxxxxxxxxxxxxxxx>, Alistair Francis <alistair.francis@xxxxxxx>, Bob Eshleman <bobbyeshleman@xxxxxxxxx>, Connor Davis <connojdavis@xxxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Wed, 25 Sep 2024 15:12:40 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 24.09.2024 18:42, Oleksii Kurochko wrote:
> --- a/xen/include/asm-generic/percpu.h
> +++ b/xen/include/asm-generic/percpu.h
> @@ -10,7 +10,14 @@
> extern char __per_cpu_start[];
> extern const char __per_cpu_data_end[];
Afaics the only users of these two are in the new common/percpu.c. These
decls want to mover there then, I think, to limit exposure.
> extern unsigned long __per_cpu_offset[NR_CPUS];
The definition for this moves to the new common/percpu.c. Hence this
declaration wants to move to xen/percpu.c.
Overall with the generalization you do I'd expect asm-generic/percpu.h
to go away altogether. That is, ...
> -void percpu_init_areas(void);
> +
> +#ifndef PARK_OFFLINE_CPUS
> +/*
> + * Do we, for platform reasons, need to actually keep CPUs online when we
> + * would otherwise prefer them to be off?
> + */
> +#define park_offline_cpus false
> +#endif
... this, for example, would likely also better be put in xen/percpu.h in
the new model.
Jan
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