linux-kernel - Re: [PATCH 2/2] ACPI / OSL: add a wrapper function to return OSI version

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Date:	Wed, 03 Jul 2013 23:57:52 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Aaron Lu <aaron.lu@...el.com>
Cc:	Matthew Garrett <matthew.garrett@...ula.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
	"seth.forshee@...onical.com" <seth.forshee@...onical.com>,
	"joeyli.kernel@...il.com" <joeyli.kernel@...il.com>,
	"daniel.vetter@...ll.ch" <daniel.vetter@...ll.ch>,
	"lenb@...nel.org" <lenb@...nel.org>,
	Bob Moore <robert.moore@...el.com>
Subject: Re: [PATCH 2/2] ACPI / OSL: add a wrapper function to return OSI version

On Tuesday, July 02, 2013 10:01:27 PM Aaron Lu wrote:
> Drivers may need to make policy decisions based on the OS that the firmware
> believes it's interacting with. ACPI firmware will make a series of _OSI
> calls, starting from the oldest OS version they support and ending with the
> most recent. This patchset adds a function in ACPI OSL layer to return the
> last successful call so that drivers know what the firmware's expecting.
> 
> Based on a patch by Matthew Garrett <matthew.garrett@...ula.com>, which
> is again based on a patch by Seth Forshee <seth.forshee@...onical.com>.
> 
> Changelog-by: Matthew Garrett <matthew.garrett@...ula.com>
> Signed-off-by: Aaron Lu <aaron.lu@...el.com>
> Cc: Matthew Garrett <matthew.garrett@...ula.com>
> Cc: Seth Forshee <seth.forshee@...onical.com>
> ---
>  drivers/acpi/osl.c   | 6 ++++++
>  include/linux/acpi.h | 6 ++++++
>  2 files changed, 12 insertions(+)
> 
> diff --git a/drivers/acpi/osl.c b/drivers/acpi/osl.c
> index 6ab2c35..7ebf07d 100644
> --- a/drivers/acpi/osl.c
> +++ b/drivers/acpi/osl.c
> @@ -1799,3 +1799,9 @@ void alloc_acpi_hp_work(acpi_handle handle, u32 type, void *context,
>  		kfree(hp_work);
>  }
>  EXPORT_SYMBOL_GPL(alloc_acpi_hp_work);
> +
> +u8 acpi_osi_version(void)
> +{
> +	return acpi_gbl_osi_data;
> +}

Actually, is there a reason not to make this static inline and put it into
the header?

Rafael


> +EXPORT_SYMBOL_GPL(acpi_osi_version);
> diff --git a/include/linux/acpi.h b/include/linux/acpi.h
> index 353ba25..fc3b5c2 100644
> --- a/include/linux/acpi.h
> +++ b/include/linux/acpi.h
> @@ -578,4 +578,10 @@ acpi_handle_printk(const char *level, void *handle, const char *fmt, ...) {}
>  })
>  #endif
>  
> +#ifdef CONFIG_ACPI
> +u8 acpi_osi_version(void);
> +#else
> +static inline u8 acpi_osi_version(void) { return 0; }
> +#endif
> +
>  #endif	/*_LINUX_ACPI_H*/
> 
-- 
I speak only for myself.
Rafael J. Wysocki, Intel Open Source Technology Center.
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