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    Subject[PATCH 00/20] mm: Preemptibility -v10
    Another -rc1, another posting.

    Rework the existing mmu_gather infrastructure.

    The direct purpose of these patches was to allow preemptible mmu_gather,
    but even without that I think these patches provide an improvement to the
    status quo.

    The first 9 patches rework the mmu_gather infrastructure. For review purpose
    I've split them into generic and per-arch patches with the last of those a
    generic cleanup.

    Also provided is a rollup of these patches, which is used as a commit in the
    git tree referenced below.

    The next patch provides generic RCU page-table freeing, and the follow up
    is a patch converting s390 to use this. I've also got 4 patches from
    DaveM lined up (not included in this series) that uses this to implement
    gup_fast() for sparc64.

    Then there is one patch that extends the generic mmu_gather batching.

    After that follow the mm preemptibility patches, these make part of the mm a
    lot more preemptible. It converts i_mmap_lock and anon_vma->lock to mutexes
    which together with the mmu_gather rework makes mmu_gather preemptible as well.

    Making i_mmap_lock a mutex also enables a clean-up of the truncate code.

    This also allows for preemptible mmu_notifiers, something that XPMEM I think

    Furthermore, it removes the new and universially detested unmap_mutex.


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