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

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Message-ID: <20080325143059.GB11323@elte.hu>
Date:	Tue, 25 Mar 2008 15:30:59 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Jack Steiner <steiner@....com>
Cc:	tglx@...utronix.de, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [RFC 8/8] x86_64: Support for new UV apic


* Jack Steiner <steiner@....com> wrote:

> Index: linux/arch/x86/kernel/genapic_64.c

> @@ -69,7 +73,16 @@ void send_IPI_self(int vector)
>  
>  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;

dont we want to put get_apic_id() into struct genapic instead? We 
already have ID management there.

also, we want to unify 32-bit and 64-bit genapic code and just have 
genapic all across x86.

	Ingo
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