• Bernhard Walle's avatar
    [PATCH] x86: add command line length to boot protocol · 8f9aeca7
    Bernhard Walle authored
    Because the command line is increased to 2048 characters after 2.6.21, it's
    not possible for boot loaders and userspace tools to determine the length
    of the command line the kernel can understand.  The benefit of knowing the
    length is that users can be warned if the command line size is too long
    which prevents surprise if things don't work after bootup.
    
    This patch updates the boot protocol to contain a field called
    "cmdline_size" that contain the length of the command line (excluding the
    terminating zero).
    
    The patch also adds missing fields (of protocol version 2.05) to the x86_64
    setup code.
    Signed-off-by: default avatarBernhard Walle <bwalle@suse.de>
    Signed-off-by: default avatarAndi Kleen <ak@suse.de>
    Cc: Alon Bar-Lev <alon.barlev@gmail.com>
    Acked-by: default avatarH. Peter Anvin <hpa@zytor.com>
    Cc: Andi Kleen <ak@suse.de>
    Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
    8f9aeca7
setup.S 21.1 KB