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Re: [PATCH v7 13/13] xen/cpufreq: Adapt SET/GET_CPUFREQ_CPPC xen_sysctl_pm_op for amd-cppc driver
- To: Anthony PERARD <anthony@xxxxxxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Wed, 27 Aug 2025 18:08:12 +0200
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- Cc: xen-devel@xxxxxxxxxxxxxxxxxxxx, ray.huang@xxxxxxx, Anthony PERARD <anthony.perard@xxxxxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Michal Orzel <michal.orzel@xxxxxxx>, Julien Grall <julien@xxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Penny Zheng <Penny.Zheng@xxxxxxx>
- Delivery-date: Wed, 27 Aug 2025 16:08:17 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 27.08.2025 17:58, Anthony PERARD wrote:
> On Fri, Aug 22, 2025 at 06:52:18PM +0800, Penny Zheng wrote:
>> diff --git a/tools/misc/xenpm.c b/tools/misc/xenpm.c
>> index 02981c4583..eedb745a46 100644
>> --- a/tools/misc/xenpm.c
>> +++ b/tools/misc/xenpm.c
>> @@ -38,6 +38,13 @@
>> static xc_interface *xc_handle;
>> static unsigned int max_cpu_nr;
>>
>> +static const char cpufreq_policy_str[][12] = {
>
> Is it necessary to hard-code an hand calculated size of the literal
> strings? Can't we let the compiler do that for us? With this as type:
>
> static const char *cpufreq_policy_str[] = {
I think it was me to request this. Your approach has an extra level of
indirection (perhaps not a big problem here), and requires runtime
relocations when building as PIE (maybe also not a big problem here).
The 2nd const that's wanted is also, as can be seen, frequently
omitted. Overall I'm generally striving towards using more efficient
code also where efficiency isn't of primary concern, simply because
code is being copied, often without looking very closely.
What we may want to do is bump to 12 to 16, adding some leeway and
making calculations a little easier.
Jan
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