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Subject[PATCH 0/8] mm: Preemptibility -v8
This series depends on the previous two series:
- mm: Simplify anon_vma lifetime rules
- mm: mmu_gather rework

These patches 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

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