On Wed, 24 Sep, at 10:39:37PM, Andi Kleen wrote:
> On Wed, Sep 24, 2014 at 09:27:39PM +0100, Matt Fleming wrote:
> > > > +static int __init intel_cqm_init(void)
> > > > +{
> > > > + int i, cpu, ret;
> > > > +
> > > > + if (!cpu_has(&boot_cpu_data, X86_FEATURE_CQM_OCCUP_LLC))
> > > > + return -ENODEV;
> > >
> > > This should use cpufeature.h
> >
> > What? Please be more explicit.
>
> Using x86_match_cpu and friends, then it would work for module
> auto loading too.
OK, I'll take a look at that, thanks.
> > > But in fact what good is the test then if you only
> > > every likely check cpu #0?
> >
> > We don't, we check every online cpu, not just cpu 0.
>
> There are no other cpus online at this point?
There are definitely other cpus online at this point, smp_init() gets
called before do_initcalls().
--
Matt Fleming, Intel Open Source Technology Center
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