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    Subject[PATCH v2 6/7] cmdline: Gives architectures opportunity to use generically defined boot cmdline manipulation
    Date
    Most architectures have similar boot command line manipulation
    options. This patchs adds the definition in init/Kconfig, gated by
    CONFIG_HAVE_CMDLINE that the architectures can select to use them.

    In order to use this, a few architectures will have to change their
    CONFIG options:
    - riscv has to replace CMDLINE_FALLBACK by CMDLINE_FROM_BOOTLOADER
    - architectures using CONFIG_CMDLINE_OVERRIDE or
    CONFIG_CMDLINE_OVERWRITE have to replace them by CONFIG_CMDLINE_FORCE.

    Architectures also have to define CONFIG_DEFAULT_CMDLINE.

    Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
    ---
    init/Kconfig | 56 ++++++++++++++++++++++++++++++++++++++++++++++++++++
    1 file changed, 56 insertions(+)

    diff --git a/init/Kconfig b/init/Kconfig
    index 22946fe5ded9..a0f2ad9467df 100644
    --- a/init/Kconfig
    +++ b/init/Kconfig
    @@ -117,6 +117,62 @@ config INIT_ENV_ARG_LIMIT
    Maximum of each of the number of arguments and environment
    variables passed to init from the kernel command line.

    +config HAVE_CMDLINE
    + bool
    +
    +config CMDLINE_BOOL
    + bool "Default bootloader kernel arguments"
    + depends on HAVE_CMDLINE
    + help
    + On some platforms, there is currently no way for the boot loader to
    + pass arguments to the kernel. For these platforms, you can supply
    + some command-line options at build time by entering them here. In
    + most cases you will need to specify the root device here.
    +
    +config CMDLINE
    + string "Initial kernel command string"
    + depends on CMDLINE_BOOL
    + default DEFAULT_CMDLINE
    + help
    + On some platforms, there is currently no way for the boot loader to
    + pass arguments to the kernel. For these platforms, you can supply
    + some command-line options at build time by entering them here. In
    + most cases you will need to specify the root device here.
    +
    +choice
    + prompt "Kernel command line type" if CMDLINE != ""
    + default CMDLINE_FROM_BOOTLOADER
    + help
    + Selects the way you want to use the default kernel arguments.
    +
    +config CMDLINE_FROM_BOOTLOADER
    + bool "Use bootloader kernel arguments if available"
    + help
    + Uses the command-line options passed by the boot loader. If
    + the boot loader doesn't provide any, the default kernel command
    + string provided in CMDLINE will be used.
    +
    +config CMDLINE_EXTEND
    + bool "Extend bootloader kernel arguments"
    + help
    + The default kernel command string will be appended to the
    + command-line arguments provided during boot.
    +
    +config CMDLINE_PREPEND
    + bool "Prepend bootloader kernel arguments"
    + help
    + The default kernel command string will be prepend to the
    + command-line arguments provided during boot.
    +
    +config CMDLINE_FORCE
    + bool "Always use the default kernel command string"
    + help
    + Always use the default kernel command string, even if the boot
    + loader passes other arguments to the kernel.
    + This is useful if you cannot or don't want to change the
    + command-line options your boot loader passes to the kernel.
    +endchoice
    +
    config COMPILE_TEST
    bool "Compile also drivers which will not load"
    depends on !UML && !S390
    --
    2.25.0
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