linux-kernel - Re: [PATCH v5 03/34] ACPI / PPTT: Add acpi_pptt_cache_v1

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Message-ID: <9f2e9fdb-0101-48c4-83cc-66b291299498@redhat.com>
Date: Wed, 19 Nov 2025 13:44:03 +1000
From: Gavin Shan <gshan@...hat.com>
To: Ben Horgan <ben.horgan@....com>, james.morse@....com
Cc: amitsinght@...vell.com, baisheng.gao@...soc.com,
 baolin.wang@...ux.alibaba.com, bobo.shaobowang@...wei.com,
 carl@...amperecomputing.com, catalin.marinas@....com, dakr@...nel.org,
 dave.martin@....com, david@...hat.com, dfustini@...libre.com,
 fenghuay@...dia.com, gregkh@...uxfoundation.org, guohanjun@...wei.com,
 jeremy.linton@....com, jonathan.cameron@...wei.com, kobak@...dia.com,
 lcherian@...vell.com, lenb@...nel.org, linux-acpi@...r.kernel.org,
 linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
 lpieralisi@...nel.org, peternewman@...gle.com, quic_jiles@...cinc.com,
 rafael@...nel.org, robh@...nel.org, rohit.mathew@....com,
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 tan.shaopeng@...itsu.com, will@...nel.org, xhao@...ux.alibaba.com
Subject: Re: [PATCH v5 03/34] ACPI / PPTT: Add acpi_pptt_cache_v1_full to use
 pptt cache as one structure

On 11/18/25 2:59 AM, Ben Horgan wrote:
> In actbl2.h, acpi_pptt_cache describes the fields in the original
> Cache Type Structure. In PPTT table version 3 a new field was added at the
> end, cache_id. This is described in acpi_pptt_cache_v1 but rather than
> including all v1 fields it just includes this one.
> 
> In lieu of this being fixed in acpica, introduce acpi_pptt_cache_v1_full to
> contain all the fields of the Cache Type Structure . Update the existing
> code to use this new struct. This simplifies the code and removes a
> non-standard use of ACPI_ADD_PTR.
> 
> Signed-off-by: Ben Horgan <ben.horgan@....com>
> ---
> I have opened a pull request to acpica to update acpi_pptt_cache_v1 to
> include all fields. https://github.com/acpica/acpica/pull/1059
> 
> Change since v4:
> Use fields directly in acpi_pptt_cache_v1_full
> Delay the casting
> 
> Changes since v3:
> New patch
> ---
>   drivers/acpi/pptt.c | 47 +++++++++++++++++++++++++++++++++++----------
>   1 file changed, 37 insertions(+), 10 deletions(-)
> 

With '__packed' added as pointed by Fenghua, LKTM.

Reviewed-by: Gavin Shan <gshan@...hat.com>