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    SubjectRe: [PATCH][RFC] __init and friends support for loadable modules
    Date
    On Wed, 8 May 2002 14:29:33 +0400, 
    Andrey Panin <pazke@orbita1.ru> wrote:
    >attached patch adds support for freeing .init sections of loadable modules
    >after init_module() function exits. Modutils have support for this since 19=
    >98,
    >but kernel support didn't exist.

    The main reason I have not done this myself is the interaction between
    freeing code areas and the exception and unwind tables. When you free
    code, you should remove or nullify the related unwind and exception
    entries. Another module could be loaded into the area that used to
    contain init code and it would then be mapped by the first module's
    tables, oops.

    Fixing exception tables is relatively easy, search_exception_table()
    can check if the address fits within the module (taking runsize into
    account) before running the exception table. Unwind data is harder, it
    is all architecture specific. Your patch will not be complete without
    fixing all tables that point at module code. Don't forget the MIPS DBE
    table.

    Rusty and I plan to completely redo module loading and unloading and
    the corresponding modutils support in 2.5. That will (hopefully)
    include additional features such as per-node replication of pure module
    areas for NUMA boxes. For me, the ability to free .init text and data
    from modules falls into the category of "would be nice but the gain is
    not worth the bother just for 2.4".

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