RFC mm: mmu_gather changes to support explicit paging

The first 3 patches in this series are some generic mm changes I would like to make, including a possible fix which may(?) be needed for ARM64. Other than the bugfix, these first 3 patches should not change anything so hopefully they aren't too controversial.

The powerpc patch is also there for reference.

Thanks,
Nick

Nicholas Piggin (4):
mm: move tlb_table_flush to tlb_flush_mmu_free
mm: mmu_notifier fix for tlb_end_vma
mm: allow arch to have tlb_flush caled on an empty TLB range powerpc/64s/radix: optimise TLB flush with precise TLB ranges in
mmu_gather

 arch/powerpc/include/asm/tlb.h | 34 +++++++++++++++++++++++++++++++++
 arch/powerpc/mm/tlb-radix.c    | 10 ++++++++++
 include/asm-generic/tlb.h      | 35 ++++++++++++++++++++++++++++++----
 mm/memory.c                    | 14 ++------------
 4 files changed, 77 insertions(+), 16 deletions(-)

2.17.0