linux-kernel - Re: [PATCH v2 06/18] x86, acpi: Initialize ACPI root table list earlier.

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Date:	Fri, 02 Aug 2013 15:49:03 +0800
From:	Tang Chen <tangchen@...fujitsu.com>
To:	Toshi Kani <toshi.kani@...com>
CC:	rjw@...k.pl, 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 06/18] x86, acpi: Initialize ACPI root table list earlier.

On 08/02/2013 07:54 AM, Toshi Kani wrote:
......
>>   /*
>> + * acpi_root_table_init - Initialize acpi_gbl_root_table_list.
>> + *
>> + * This function will parse RSDT or XSDT, find all tables' phys addr,
>> + * initialize acpi_gbl_root_table_list, and record all tables' phys addr
>> + * in acpi_gbl_root_table_list.
>> + */
>> +void __init acpi_root_table_init(void)
>
> I think acpi_root_table_init() is a bit confusing with
> acpi_boot_table_init().  Perhaps, something like
> acpi_boot_table_pre_init() or early_acpi_boot_table_init() is better to
> indicate that this new function is called before acpi_boot_table_init().
>

OK, will change it to early_acpi_boot_table_init().

>> +{
>> +	dmi_check_system(acpi_dmi_table);
>> +
>> +	/* If acpi_disabled, bail out */
>> +	if (acpi_disabled)
>> +		return;
>> +
>> +	/* Initialize the ACPI boot-time table parser */
>> +	if (acpi_table_init()) {
>> +		disable_acpi();
>> +		return;
>> +	}
>> +}
>> +
>> +/*
>>    * acpi_boot_table_init() and acpi_boot_init()
>>    *  called from setup_arch(), always.
>>    *	1. checksums all tables
>> @@ -1511,21 +1533,7 @@ static struct dmi_system_id __initdata acpi_dmi_table_late[] = {
>>
>>   void __init acpi_boot_table_init(void)
>
> The comment of this function needs to be updated.  For instance, it
> describes acpi_table_init(), which you just relocated.
>
>   * acpi_table_init() is separate to allow reading SRAT without
>   * other side effects.
>   *

Sure. But I don't quite understand this comment. It seems that
acpi_table_init() has nothing to do with SRAT.

Do you know anything about this ?

>
>>   {
>> -	dmi_check_system(acpi_dmi_table);
>> -
>> -	/*
>> -	 * If acpi_disabled, bail out
>> -	 */
>> -	if (acpi_disabled)
>> -		return;
>
> I think this check is still necessary.
>

Yes. Will add it.

Thanks.
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