linux-kernel - Re: [RFC 6/8] x86_64: Define the macros and tables for the basic UV infrastructure.

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Date:	25 Mar 2008 11:11:11 +0100
From:	Andi Kleen <andi@...stfloor.org>
To:	Jack Steiner <steiner@....com>
Cc:	mingo@...e.hu, tglx@...utronix.de, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [RFC 6/8] x86_64: Define the macros and tables for the basic UV infrastructure.

Jack Steiner <steiner@....com> writes:

> Define the macros and tables for the basic UV infrastructure.
> 
> 
> (NOTE: a work-in-progress. Pieces missing....)

Does the kernel really need all this information? You just want
to address the UV-APIC right? I suspect you could use a much stripped
down file.

> +DECLARE_PER_CPU(struct uv_hub_info_s, __uv_hub_info);
> +#define uv_hub_info 		(&__get_cpu_var(__uv_hub_info))
> +#define uv_cpu_hub_info(cpu)	(&per_cpu(__uv_hub_info, cpu))
> +
> +/* This header file is used in BIOS code that runs in physical mode */

Not sure what physical mode is.

> +#ifdef __BIOS__
> +#define UV_ADDR(x)		((unsigned long *)(x))
> +#else
> +#define UV_ADDR(x)		((unsigned long *)__va(x))
> +#endif

But it it would be cleaner if your BIOS just supplied a suitable __va()
and then you remove these macros.

-Andi
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