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    Subject[patch 00/26] Dynamic kernel command-line
    This patch has already been posted by Alon Bar-Lev <>
    in 2nd Dec 2006. He didn't get any response. Because I think that this
    patch would be really useful being able to increase the command line, I
    post this patch again to get some response.

    This patches are against 2.6.20-rc4-mm1.

    Current implementation stores a static command-line buffer allocated to
    COMMAND_LINE_SIZE size. Most architectures stores two copies of this
    buffer, one for future reference and one for parameter parsing.

    Current kernel command-line size for most architecture is much too small
    for module parameters, video settings, initramfs parameters and much
    more. The problem is that setting COMMAND_LINE_SIZE to a grater value,
    allocates static buffers.

    In order to allow a greater command-line size, these buffers should be
    dynamically allocated or marked as init disposable buffers, so unused
    memory can be released.

    This patch renames the static saved_command_line variable into
    boot_command_line adding __initdata attribute, so that it can be
    disposed after initialization. This rename is required so applications
    that use saved_command_line will not be affected by this change.

    It reintroduces saved_command_line as dynamically allocated buffer to
    match the data in boot_command_line.

    It also mark secondary command-line buffer as __initdata, and copies it
    to dynamically allocated static_command_line buffer components may hold
    reference to it after initialization.

    This patch is for linux-2.6.19 and is divided to target each
    architecture. I could not check this in any architecture so please
    forgive me if I got it wrong.

    The per-architecture modification is very simple, use boot_command_line
    in place of saved_command_line. The common code is the change into
    dynamic command-line.

    Signed-off-by: Alon Bar-Lev <>

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      Last update: 2007-01-18 15:05    [W:0.023 / U:7.448 seconds]
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