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Re: [PATCH v v2 1/7] x86: Remove x86 prefixed names from mcheck code
- To: Kevin Lampis <kevin.lampis@xxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Fri, 13 Mar 2026 08:04:58 +0100
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- Cc: roger.pau@xxxxxxxxxx, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Fri, 13 Mar 2026 07:05:24 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 13.03.2026 01:01, Andrew Cooper wrote:
> On 12/03/2026 8:43 pm, Kevin Lampis wrote:
>> diff --git a/xen/arch/x86/cpu/mcheck/mce_intel.c
>> b/xen/arch/x86/cpu/mcheck/mce_intel.c
>> index 839a0e5ba9..4d6b7d588e 100644
>> --- a/xen/arch/x86/cpu/mcheck/mce_intel.c
>> +++ b/xen/arch/x86/cpu/mcheck/mce_intel.c
>> @@ -711,10 +711,7 @@ static bool mce_is_broadcast(struct cpuinfo_x86 *c)
>> * DisplayFamily_DisplayModel encoding of 06H_EH and above,
>> * a MCA signal is broadcast to all logical processors in the system
>> */
>> - if ( c->x86_vendor == X86_VENDOR_INTEL && c->x86 == 6 &&
>> - c->x86_model >= 0xe )
>> - return true;
>> - return false;
>> + return c->vendor == X86_VENDOR_INTEL && c->vfm >= INTEL_CORE_YONAH;
>> }
>
> This breaks P4.
>
> It is not safe to write expressions like this, and I've already
> explained why.
Plus I had asked whether the comparison needs to stay at all, seeing how
Xen has been 64-bit only for a pretty long while.
Jan
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