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SubjectRE: [PATCH] ACPICA: make acpi_load_table() return table index
Bob,

On Thu, 12 Sep 2019, Moore, Robert wrote:
> The ability to unload an ACPI table (especially AML tables such as
> SSDTs) is in the process of being deprecated in ACPICA -- since it is
> also deprecated in the current ACPI specification. This is being done
> because of the difficulty of deleting the namespace entries for the
> table. FYI, Windows does not properly support this function either.

ok, I see it can be a problem to unload an AML table with all it's
consequences e.g. with respect to driver unregistering in setups with
complex dependencies. It will only work properly under certain conditions
- nevertheless acpi_tb_unload_table() is still exported in ACPICA and we
should get this working as it worked before.

The API change I request is not directly related to table unloading, it's
just that the index of the loaded table is returned for future reference:

[...]

>> diff --git a/include/acpi/acpixf.h b/include/acpi/acpixf.h index 3845c8fcc94e5..c90bbdc4146a6 100644
>> --- a/include/acpi/acpixf.h
>> +++ b/include/acpi/acpixf.h
>> @@ -452,7 +452,8 @@ ACPI_EXTERNAL_RETURN_STATUS(acpi_status ACPI_INIT_FUNCTION
>> u8 physical))
>>
>> ACPI_EXTERNAL_RETURN_STATUS(acpi_status
>> - acpi_load_table(struct acpi_table_header *table))
>> + acpi_load_table(struct acpi_table_header *table,
>> + u32 *table_idx))
>>
>> ACPI_EXTERNAL_RETURN_STATUS(acpi_status
>> acpi_unload_parent_table(acpi_handle object))
>> --
>> 2.17.1
>>

This allows for a simple fix of the regression and doesn't imply future
support for table unloading. Would this be acceptable?

Niko

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