linux-kernel - Re: [PATCH 13/21] x86, acpi: Try to find SRAT in firmware earlier.

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Message-ID: <20130724155546.GB20377@mtj.dyndns.org>
Date:	Wed, 24 Jul 2013 11:55:46 -0400
From:	Tejun Heo <tj@...nel.org>
To:	Tang Chen <tangchen@...fujitsu.com>
Cc:	tglx@...utronix.de, mingo@...e.hu, hpa@...or.com,
	akpm@...ux-foundation.org, trenn@...e.de, yinghai@...nel.org,
	jiang.liu@...wei.com, wency@...fujitsu.com, laijs@...fujitsu.com,
	isimatu.yasuaki@...fujitsu.com, izumi.taku@...fujitsu.com,
	mgorman@...e.de, minchan@...nel.org, mina86@...a86.com,
	gong.chen@...ux.intel.com, vasilis.liaskovitis@...fitbricks.com,
	lwoodman@...hat.com, riel@...hat.com, jweiner@...hat.com,
	prarit@...hat.com, zhangyanfei@...fujitsu.com,
	yanghy@...fujitsu.com, x86@...nel.org, linux-doc@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	linux-acpi@...r.kernel.org
Subject: Re: [PATCH 13/21] x86, acpi: Try to find SRAT in firmware earlier.

On Wed, Jul 24, 2013 at 06:12:03PM +0800, Tang Chen wrote:
> Do you mean get the SRAT's address without touching any ACPI global
> variables, such as acpi_gbl_root_table_list ?
> 
> The physical addresses of all tables is stored in RSDT (Root System
> Description Table), which is the root table. We need to parse RSDT
> to get SRAT address.
> 
> Using acpi_gbl_root_table_list is very convenient. The initialization
> of acpi_gbl_root_table_list is using acpi_os_map_memory(), so it can be
> done before init_mem_mapping() and relocate_initrd().
> 
> With acpi_gbl_root_table_list initialized, we can iterate it and find
> SRAT easily. Otherwise, we have to do the same procedure to parse RSDT,
> and find SRAT, which I don't think could be any simpler. I think reuse
> the existing acpi_gbl_root_table_list code is better.

I see.  As long as ACPI people are fine with the modifications, I
don't mind either way.

Thanks.

-- 
tejun
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