linux-kernel - Re: [PATCH 1/3] ACPI: PRM: Add acpi_prm_handler

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Message-ID: <CAJZ5v0gvn21FeMNpJDWOZ0ZH5CZzDt0zEuXjHEpWxHjq9vHqyw@mail.gmail.com>
Date: Thu, 16 Oct 2025 18:09:12 +0200
From: "Rafael J. Wysocki" <rafael@...nel.org>
To: Borislav Petkov <bp@...en8.de>
Cc: "Rafael J. Wysocki" <rafael@...nel.org>, Yazen Ghannam <yazen.ghannam@....com>, 
	Len Brown <lenb@...nel.org>, Tony Luck <tony.luck@...el.com>, linux-acpi@...r.kernel.org, 
	linux-kernel@...r.kernel.org, linux-edac@...r.kernel.org, 
	Avadhut Naik <avadhut.naik@....com>, John Allen <john.allen@....com>, 
	Mario Limonciello <mario.limonciello@....com>
Subject: Re: [PATCH 1/3] ACPI: PRM: Add acpi_prm_handler_available()

On Thu, Oct 16, 2025 at 6:02 PM Borislav Petkov <bp@...en8.de> wrote:
>
> On Mon, Oct 06, 2025 at 03:10:25PM +0000, Yazen Ghannam wrote:
> > Add a helper function to check if a PRM handler/module is present.
> >
> > This can be used during init time by code that depends on a particular
> > handler. If the handler is not present, then the code does not need to
> > be loaded.
> >
> > Signed-off-by: Yazen Ghannam <yazen.ghannam@....com>
> > ---
> >  drivers/acpi/prmt.c  | 6 ++++++
> >  include/linux/prmt.h | 2 ++
> >  2 files changed, 8 insertions(+)
> >
> > diff --git a/drivers/acpi/prmt.c b/drivers/acpi/prmt.c
> > index 6792d4385eee..7b8b5d2015ec 100644
> > --- a/drivers/acpi/prmt.c
> > +++ b/drivers/acpi/prmt.c
> > @@ -244,6 +244,12 @@ static struct prm_handler_info *find_prm_handler(const guid_t *guid)
> >       return (struct prm_handler_info *) find_guid_info(guid, GET_HANDLER);
> >  }
> >
> > +bool acpi_prm_handler_available(const guid_t *guid)
> > +{
> > +     return find_prm_handler(guid) && find_prm_module(guid);
> > +}
> > +EXPORT_SYMBOL_GPL(acpi_prm_handler_available);
> > +
> >  /* In-coming PRM commands */
> >
> >  #define PRM_CMD_RUN_SERVICE          0
> > diff --git a/include/linux/prmt.h b/include/linux/prmt.h
> > index c53ab287e932..8cdc987de963 100644
> > --- a/include/linux/prmt.h
> > +++ b/include/linux/prmt.h
> > @@ -4,9 +4,11 @@
> >
> >  #ifdef CONFIG_ACPI_PRMT
> >  void init_prmt(void);
> > +bool acpi_prm_handler_available(const guid_t *handler_guid);
> >  int acpi_call_prm_handler(guid_t handler_guid, void *param_buffer);
> >  #else
> >  static inline void init_prmt(void) { }
> > +static inline bool acpi_prm_handler_available(const guid_t *handler_guid) { return false; }
> >  static inline int acpi_call_prm_handler(guid_t handler_guid, void *param_buffer)
> >  {
> >       return -EOPNOTSUPP;
> >
> > --
>
> Rafael?

I've seen it.  Are you asking for anything in particular?