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    Subject[PATCH 2/2] ACPI / OSL: add a wrapper function to return OSI version
    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@nebula.com>, which
    is again based on a patch by Seth Forshee <seth.forshee@canonical.com>.

    Changelog-by: Matthew Garrett <matthew.garrett@nebula.com>
    Signed-off-by: Aaron Lu <aaron.lu@intel.com>
    Cc: Matthew Garrett <matthew.garrett@nebula.com>
    Cc: Seth Forshee <seth.forshee@canonical.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;
    +}
    +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*/
    --
    1.8.3.2.10.g43d11f4

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