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Re: [PATCH v1 03/29] xen/asm-generic: introduce stub header cpufeature.h
- To: Oleksii Kurochko <oleksii.kurochko@xxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Thu, 19 Oct 2023 11:11:21 +0200
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- Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, George Dunlap <george.dunlap@xxxxxxxxxx>, Julien Grall <julien@xxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Wei Liu <wl@xxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Thu, 19 Oct 2023 09:11:35 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 14.09.2023 16:56, Oleksii Kurochko wrote:
> --- /dev/null
> +++ b/xen/include/asm-generic/cpufeature.h
> @@ -0,0 +1,23 @@
> +/* SPDX-License-Identifier: GPL-2.0-only */
> +#ifndef __ASM_GENERIC_CPUFEATURE_H__
> +#define __ASM_GENERIC_CPUFEATURE_H__
> +
> +#ifndef __ASSEMBLY__
> +
> +static inline int cpu_nr_siblings(unsigned int cpu)
> +{
> + return 1;
> +}
> +
> +#endif
> +
> +#endif /* __ASM_GENERIC_CPUFEATURE_H__ */
I'm not convinced an arch can get away without such a header. Certainly
RISC-V and PPC can't, with all their ISA extensions that already exist
(part of which will want making use of, others may simply want exposing
to guests).
Jan
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