linux-kernel - RE: [PATCHv2 01/12] acpi: Create subtable parsing infrastructure

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Date:   Wed, 19 Dec 2018 23:19:30 +0000
From:   "Schmauss, Erik" <erik.schmauss@...el.com>
To:     "Rafael J. Wysocki" <rafael@...nel.org>,
        "Busch, Keith" <keith.busch@...el.com>,
        "Moore, Robert" <robert.moore@...el.com>
CC:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        "ACPI Devel Maling List" <linux-acpi@...r.kernel.org>,
        Linux Memory Management List <linux-mm@...ck.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Hansen, Dave" <dave.hansen@...el.com>,
        "Williams, Dan J" <dan.j.williams@...el.com>
Subject: RE: [PATCHv2 01/12] acpi: Create subtable parsing infrastructure



> -----Original Message-----
> From: linux-acpi-owner@...r.kernel.org [mailto:linux-acpi-
> owner@...r.kernel.org] On Behalf Of Rafael J. Wysocki
> Sent: Tuesday, December 11, 2018 1:45 AM
> To: Busch, Keith <keith.busch@...el.com>
> Cc: Linux Kernel Mailing List <linux-kernel@...r.kernel.org>; ACPI Devel
> Maling List <linux-acpi@...r.kernel.org>; Linux Memory Management List
> <linux-mm@...ck.org>; Greg Kroah-Hartman
> <gregkh@...uxfoundation.org>; Rafael J. Wysocki <rafael@...nel.org>;
> Hansen, Dave <dave.hansen@...el.com>; Williams, Dan J
> <dan.j.williams@...el.com>
> Subject: Re: [PATCHv2 01/12] acpi: Create subtable parsing infrastructure
> 
> On Tue, Dec 11, 2018 at 2:05 AM Keith Busch <keith.busch@...el.com>
> wrote:
> >

Hi Rafael and Bob,

> > Parsing entries in an ACPI table had assumed a generic header
> > structure that is most common. There is no standard ACPI header,
> > though, so less common types would need custom parsers if they want go
> > through their sub-table entry list.
> 
> It looks like the problem at hand is that acpi_hmat_structure is incompatible
> with acpi_subtable_header because of the different layout and field sizes.

Just out of curiosity, why don't we use ACPICA code to parse static ACPI tables
in Linux?

We have a disassembler for static tables that parses all supported tables. This
seems like a duplication of code/effort...

Erik
> 
> If so, please state that clearly here.
> 
> With that, please feel free to add
> 
> Reviewed-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
> 
> to this patch.