From:   Matthew Wilcox <willy-AT-infradead.org>
    To:   Jeff Xu <jeffxu-AT-google.com>

    ...

    Yes, thank you for demonstrating that you have no idea what you need to
    block.

    > It is practical to keep syscall extentable, when the business logic is the same.

    I concur with Theo & Linus.  You don't know what you're doing.  I think
    the underlying idea of mimmutable() is good, but how you've split it up
    and how you've implemented it is terrible.

    ...