[PATCH v2 6/8] x86: Add hardware prefetch control support for x86

[tarumizu.kohei at fujitsu.com]

> > +static int broadwell_write_pfreg(enum pfctl_attr pattr, unsigned int cpu,
> > +				 unsigned int level, u64 val)
> > +{
> > +	int ret;
> > +	u64 reg;
> > +
> > +	ret = rdmsrl_on_cpu(cpu, MSR_MISC_FEATURE_CONTROL, &reg);
> > +	if (ret)
> > +		return ret;
> > +
> > +	ret = broadwell_modify_pfreg(pattr, &reg, level, val);
> > +	if (ret < 0)
> > +		return ret;
> > +
> > +	ret = wrmsrl_on_cpu(cpu, MSR_MISC_FEATURE_CONTROL, reg);
> > +	if (ret)
> > +		return ret;
> > +
> > +	return 0;
> > +}
> 
> This needs to integrate _somehow_ with the pseudo_lock.c code.  Right now, I
> suspect that code would just overwrite any MSR changes made by this code.

I lacked consideration for pseudo_lock.c code. I try to integration
with that code.