linux-kernel - Re: [PATCH v2 RESEND 05/18] x86, ACPICA: Split acpi_boot_table

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Date:	Mon, 05 Aug 2013 11:21:51 +0800
From:	Tang Chen <tangchen@...fujitsu.com>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
CC:	robert.moore@...el.com, lv.zheng@...el.com, lenb@...nel.org,
	tglx@...utronix.de, mingo@...e.hu, hpa@...or.com,
	akpm@...ux-foundation.org, tj@...nel.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 v2 RESEND 05/18] x86, ACPICA: Split acpi_boot_table_init()
 into two parts.

Hi Rafael,

On 08/02/2013 09:00 PM, Rafael J. Wysocki wrote:
......
>> This patch splits acpi_boot_table_init() into two steps:
>> 1. Parse RSDT, which cannot be overrided, and initialize
>>     acpi_gbl_root_table_list. (step 1 + 2 above)
>> 2. Install all ACPI tables into acpi_gbl_root_table_list.
>>     (step 3 + 4 above)
>>
>> In later patches, we will do step 1 + 2 earlier.
>
> Please note that Linux is not the only user of the code you're modifying, so
> you need to make it possible to use the existing functions.
>
> In particular, acpi_tb_parse_root_table() can't be modified the way you did it,
> because that would require all of the users of ACPICA to be modified.

OK, I understand it. Then how about acpi_tb_install_table() ?

acpi_tb_install_table() is also an ACPICA API. But can we split the
acpi_initrd_table_override part out ? Like the following:

1. Initialize acpi_gbl_root_table_list earlier, and install all tables
    provided by firmware.
2. Find SRAT in initrd. If no overridden SRAT, get the SRAT in 
acpi_gbl_root_table_list
    directly. And mark hotpluggable memory. (This the job I want to do.)
3. DO acpi_initrd_table_override job.

Finally it will work like the current kernel. The only difference is:
Before the patch-set, it try to do override first, and then install 
firmware tables.
After the patch-set, it installs firmware tables, and then do the override.

Thanks.

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