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    Subject[PATCH] [10/12] x86_64: Add warning in Documentation that zero-page is not a stable ABI
    Date

    Some people writing boot loaders seem to falsely belief the 32bit zero page is a
    stable interface for out of tree code like the real mode boot protocol. Add a comment
    clarifying that is not true.

    Signed-off-by: Andi Kleen <ak@suse.de>

    ---
    Documentation/i386/zero-page.txt | 10 ++++++++++
    1 file changed, 10 insertions(+)

    Index: linux/Documentation/i386/zero-page.txt
    ===================================================================
    --- linux.orig/Documentation/i386/zero-page.txt
    +++ linux/Documentation/i386/zero-page.txt
    @@ -1,3 +1,13 @@
    +---------------------------------------------------------------------------
    +!!!!!!!!!!!!!!!WARNING!!!!!!!!
    +The zero page is a kernel internal data structure, not a stable ABI. It might change
    +without warning and the kernel has no way to detect old version of it.
    +If you're writing some external code like a boot loader you should only use
    +the stable versioned real mode boot protocol described in boot.txt. Otherwise the kernel
    +might break you at any time.
    +!!!!!!!!!!!!!WARNING!!!!!!!!!!!
    +----------------------------------------------------------------------------
    +
    Summary of boot_params layout (kernel point of view)
    ( collected by Hans Lermen and Martin Mares )

    -
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