Re: [PATCH v7 015/120] x86/cpu: Use parsed CPUID(0x80000002) to CPUID(0x80000004)

[Ahmed S. Darwish]

On Thu, 11 Jun 2026, David Laight wrote:
>
> "Ahmed S. Darwish" <darwi@xxxxxxxxxxxxx> wrote:
> >
> > -	v = (unsigned int *)c->x86_model_id;
> > -	cpuid(0x80000002, &v[0], &v[1], &v[2], &v[3]);
> > -	cpuid(0x80000003, &v[4], &v[5], &v[6], &v[7]);
> > -	cpuid(0x80000004, &v[8], &v[9], &v[10], &v[11]);
> > +	*(struct leaf_0x80000002_0 *)&c->x86_model_id[0]  = *l2;
> > +	*(struct leaf_0x80000003_0 *)&c->x86_model_id[16] = *l3;
> > +	*(struct leaf_0x80000004_0 *)&c->x86_model_id[32] = *l4;
>
> Those assignment are nasty.
> You could probably use an anon union to do:
> 	c->x86_model_id_leaf_2 = *l2;
>

I appreciate the feedback, but I'm not gonna modify a central data
structure like 'cpuinfo_x86' for the sake of this single call site.

A memcpy() can make things look nicer, but IMHO there are more important
things to do at this stage.

All the best,
Ahmed