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SubjectRe: [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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