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Re: [PATCH v3 04/15] xen/cpufreq: move XEN_PROCESSOR_PM_xxx to internal header


  • To: Penny Zheng <Penny.Zheng@xxxxxxx>
  • From: Jan Beulich <jbeulich@xxxxxxxx>
  • Date: Mon, 24 Mar 2025 16:11:57 +0100
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  • Cc: ray.huang@xxxxxxx, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, Anthony PERARD <anthony.perard@xxxxxxxxxx>, Michal Orzel <michal.orzel@xxxxxxx>, Julien Grall <julien@xxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
  • Delivery-date: Mon, 24 Mar 2025 15:12:04 +0000
  • List-id: Xen developer discussion <xen-devel.lists.xenproject.org>

On 06.03.2025 09:39, Penny Zheng wrote:
> XEN_PROCESSOR_PM_xxx are used to set xen_processor_pmbits only, which is
> a Xen-internal variable only. Although PV Dom0 passed these bits in si->flags,
> they haven't been used anywhere.

Please be careful with "not used anywhere". See e.g.
https://xenbits.xen.org/gitweb/?p=legacy/linux-2.6.18-xen.git;a=blob;f=arch/i386/kernel/acpi/processor_extcntl_xen.c;h=eb6a53e9572c137da505a7d4970b1a5b7e1c522d;hb=HEAD#l193

> So this commit moves XEN_PROCESSOR_PM_xxx back to internal header
> "acpi/cpufreq/processor_perf.h"

Essentially you're again altering the stable public ABI in a way that's not
acceptable.

Jan



 


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