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Re: [PATCH v1 03/11] xen/x86: introduce "cpufreq=amd-pstate" xen cmdline
- To: "Penny, Zheng" <penny.zheng@xxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Wed, 15 Jan 2025 09:32:26 +0100
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- Cc: "Stabellini, Stefano" <stefano.stabellini@xxxxxxx>, "Huang, Ray" <Ray.Huang@xxxxxxx>, "Ragiadakou, Xenia" <Xenia.Ragiadakou@xxxxxxx>, "Andryuk, Jason" <Jason.Andryuk@xxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Julien Grall <julien@xxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- Delivery-date: Wed, 15 Jan 2025 08:32:37 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 15.01.2025 09:18, Penny, Zheng wrote:
>> -----Original Message-----
>> From: Jan Beulich <jbeulich@xxxxxxxx>
>> Sent: Thursday, January 9, 2025 5:59 PM
>>
>> On 03.12.2024 09:11, Penny Zheng wrote:
>>> --- a/xen/arch/x86/platform_hypercall.c
>>> +++ b/xen/arch/x86/platform_hypercall.c
>>> @@ -574,6 +574,12 @@ ret_t do_platform_op(
>>>
>>> case XEN_PM_CPPC:
>>> {
>>> + if ( !(xen_processor_pmbits & XEN_PROCESSOR_PM_CPPC) )
>>> + {
>>> + ret = -ENOSYS;
>>
>> ENOSYS isn't appropriate for such a situation.
>
> I've mirrored the return value, so maybe -EINVAL is better?
Generally most wrong uses of ENOSYS want replacing by EOPNOTSUPP.
Jan
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