[PATCH 00/13] mm: mmu_gather rework -v2

[Peter Zijlstra]

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 10 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.

For the final commit I would provide a roll-up of these patches so as not
to wreck bisectability of non generic archs.

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.


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