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    Subject[PATCH v3 3/7] ACPI / osi: Add acpi_osi=!! to allow reverting acpi_osi=!
    Date
    This patch introduces acpi_osi=!! so that quirks may use it to revert
    acpi_osi=!.

    Reported-and-tested-by: Lukas Wunner <lukas@wunner.de>
    Tested-by: Chen Yu <yu.c.chen@intel.com>
    Signed-off-by: Lv Zheng <lv.zheng@intel.com>
    ---
    Documentation/kernel-parameters.txt | 2 ++
    drivers/acpi/osl.c | 3 +++
    2 files changed, 5 insertions(+)

    diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
    index 0b3de80..c48f387 100644
    --- a/Documentation/kernel-parameters.txt
    +++ b/Documentation/kernel-parameters.txt
    @@ -312,6 +312,8 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
    acpi_osi=!* # remove all strings
    acpi_osi=! # disable all built-in OS vendor
    strings
    + acpi_osi=!! # enable all built-in OS vendor
    + strings
    acpi_osi= # disable all strings

    'acpi_osi=!' can be used in combination with single or
    diff --git a/drivers/acpi/osl.c b/drivers/acpi/osl.c
    index cd9667f..fbedea7 100644
    --- a/drivers/acpi/osl.c
    +++ b/drivers/acpi/osl.c
    @@ -1489,6 +1489,9 @@ void __init acpi_osi_setup(char *str)
    osi->enable = false;
    }
    return;
    + } else if (*str == '!') {
    + osi_config.default_disabling = 0;
    + return;
    }
    enable = false;
    }
    --
    1.7.10
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