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Re: [Xen-devel] [PATCH v2 12/13] x86/sysctl: Implement XEN_SYSCTL_get_cpu_policy
- To: Roger Pau Monné <roger.pau@xxxxxxxxxx>
- From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- Date: Mon, 16 Jul 2018 11:58:04 +0100
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- Cc: Sergey Dyasli <sergey.dyasli@xxxxxxxxxx>, Wei Liu <wei.liu2@xxxxxxxxxx>, Ian Jackson <Ian.Jackson@xxxxxxxxxxxxx>, Xen-devel <xen-devel@xxxxxxxxxxxxx>, Jan Beulich <JBeulich@xxxxxxxx>, Daniel De Graaf <dgdegra@xxxxxxxxxxxxx>
- Delivery-date: Mon, 16 Jul 2018 10:58:15 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
- Openpgp: preference=signencrypt
On 16/07/18 11:16, Roger Pau Monné wrote:
>
>> +
>> + sysctl.cmd = XEN_SYSCTL_get_cpu_policy;
>> + sysctl.u.cpu_policy.index = index;
>> + sysctl.u.cpu_policy.nr_leaves = *nr_leaves;
>> + set_xen_guest_handle(sysctl.u.cpu_policy.cpuid_policy, leaves);
>> + sysctl.u.cpu_policy.nr_msrs = *nr_msrs;
>> + set_xen_guest_handle(sysctl.u.cpu_policy.msr_policy, msrs);
> sysctl can be initialized at declaration time instead of zeroing it
> and then setting the fields:
>
> struct xen_sysctl sysctl = {
> .cmd = XEN_SYSCTL_get_cpu_policy;
> .u.cpu_policy.index = index;
> .u.cpu_policy.nr_leaves = *nr_leaves;
> ...
> };
This doesn't compile in a CentOS 6 era GCC. It can't cope with
initialisers of anonymous unions, and is the reason why a lot of the
toolstack logic is in the form presented in this patch, rather than the
cleaner option you present.
~Andrew
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