linux-kernel - Re: [PATCH 0/4] platform/x86: wmi: Prepare for future changes

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Message-ID: <6dcc3eda-f06a-22b3-fff6-f4805f709f5f@linux.intel.com>
Date: Mon, 10 Nov 2025 13:00:20 +0200 (EET)
From: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
To: Armin Wolf <W_Armin@....de>
cc: Mario Limonciello <superm1@...nel.org>, viro@...iv.linux.org.uk, 
    brauner@...nel.org, Hans de Goede <hansg@...nel.org>, jack@...e.cz, 
    linux-fsdevel@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>, 
    platform-driver-x86@...r.kernel.org
Subject: Re: [PATCH 0/4] platform/x86: wmi: Prepare for future changes

On Wed, 5 Nov 2025, Armin Wolf wrote:

> Am 04.11.25 um 21:52 schrieb Mario Limonciello:
> 
> > On 11/4/25 2:45 PM, Armin Wolf wrote:
> > > After over a year of reverse engineering, i am finally ready to
> > > introduce support for WMI-ACPI marshalling inside the WMI driver core.
> > marshaling> Since the resulting patch series is quite large, i am planning
> > to
> > > submit the necessary patches as three separate patch series.
> > > 
> > > This is supposed to be the first of the three patch series. Its main
> > > purpose is to prepare the WMI driver core for the upcoming changes.
> > > The first patch fixes an issue inside the nls utf16 to utf8 conversion
> > > code, while the next two patches fix some minor issues inside the WMI
> > > driver core itself. The last patch finally moves the code of the WMI
> > > driver core into a separate repository to allow for future additions
> > > without cluttering the main directory.
> > 
> > One question I have here on the patch to move things.
> > 
> > Since Windows on ARM (WoA) laptops are a thing - is this still actually x86
> > specific?  I am wondering if this should be moving to a different subsystem
> > altogether like ACPI; especially now with this impending other large patch
> > series you have on your way.
> 
> I know of a few WoA laptops that contain ACPI-WMI devices, meaning this driver
> is indeed not x86-specific.
> However i need to make some changes to the WMI driver core (and actually tests
> it on a AArch64 VM) first
> before moving it out of drivers/platform/x86.
> 
> Once i am actually ready for this i would prefer to move the whole stuff to
> drivers/platform, as drivers/acpi
> IMHO is better suited for core ACPI drivers.

So no need to put it under drivers/platform/x86/wmi/ then at all. It 
can move directly to drivers/platform/wmi/ and you work there towards 
making it non-x86-specific.

-- 
 i.

> 
> Thanks,
> Armin Wolf
> 
> > > 
> > > Armin Wolf (4):
> > >    fs/nls: Fix utf16 to utf8 conversion
> > >    platform/x86: wmi: Use correct type when populating ACPI objects
> > >    platform/x86: wmi: Remove extern keyword from prototypes
> > >    platform/x86: wmi: Move WMI core code into a separate directory
> > > 
> > >   Documentation/driver-api/wmi.rst           |  2 +-
> > >   MAINTAINERS                                |  2 +-
> > >   drivers/platform/x86/Kconfig               | 30 +------------------
> > >   drivers/platform/x86/Makefile              |  2 +-
> > >   drivers/platform/x86/wmi/Kconfig           | 34 ++++++++++++++++++++++
> > >   drivers/platform/x86/wmi/Makefile          |  8 +++++
> > >   drivers/platform/x86/{wmi.c => wmi/core.c} | 34 +++++++++++++---------
> > >   fs/nls/nls_base.c                          | 16 +++++++---
> > >   include/linux/wmi.h                        | 15 ++++------
> > >   9 files changed, 84 insertions(+), 59 deletions(-)
> > >   create mode 100644 drivers/platform/x86/wmi/Kconfig
> > >   create mode 100644 drivers/platform/x86/wmi/Makefile
> > >   rename drivers/platform/x86/{wmi.c => wmi/core.c} (98%)
> > > 
> > 
> > Reviewed-by: Mario Limonciello (AMD) <superm1@...nel.org>
>