linux-kernel - Re: [RFC 8/8] x86_64: Support for new UV apic

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Date:	Sun, 30 Mar 2008 16:08:43 -0500
From:	Jack Steiner <steiner@....com>
To:	Yinghai Lu <yhlu.kernel@...il.com>
Cc:	mingo@...e.hu, tglx@...utronix.de, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [RFC 8/8] x86_64: Support for new UV apic

> >   unsigned int get_apic_id(void)
> >   {
> >  -       return (apic_read(APIC_ID) >> 24) & 0xFFu;
> >  +       unsigned int id;
> >  +
> >  +       preempt_disable();
> >  +       id = apic_read(APIC_ID);
> >  +       if (uv_system_type >= UV_X2APIC)
> >  +               id  |= __get_cpu_var(x2apic_extra_bits);
> >  +       else
> >  +               id = (id >> 24) & 0xFFu;;
> >  +       preempt_enable();
> >  +       return id;
> >
> 
> you can not shift id here.
> 
> GET_APIC_ID will shift that again.
> 
> you apic id will be 0 for all cpu
> 

I think this is fixed in the patch that I submitted on Friday. I
had to rework the GET_APIC_ID() changes because of the unification
of -32 & -64 apic code. I think the new code is much cleaner...


--- jack
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