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    SubjectRe: [PATCH, take4] FUTEX : new PRIVATE futexes
    Eric Dumazet wrote:
    > Hi all
    > Updates on this take4 :
    > - All remarks from Nick were addressed I hope

    Yeah looks very nice. Thanks for doing that.

    > - Current mm code have a problem with 64bit futexes, as spoted by Nick :
    > get_futex_key() does a check against sizeof(u32) regardless of futex being 64bits or not.
    > So it is possible a 64bit futex spans two pages of memory...
    > I had to change get_futex_key() prototype to be able to do a correct test.

    I wonder if it should be encfocing alignment to keep in on 1 page?

    Acked-by: Nick Piggin <>

    I'll be away for a couple of days, but I'll look at running some performance
    tests when I get back.


    SUSE Labs, Novell Inc.
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