mm/madvise: batch tlb flushes for MADV_DONTNEED[_LOCKED]

MADV_DONTNEED[_LOCKED] handling for [process_]madvise() flushes tlb for
each vma of each address range.  Update the logic to do tlb flushes in a
batched way.  Initialize an mmu_gather object from do_madvise() and
vector_madvise(), which are the entry level functions for
[process_]madvise(), respectively.  And pass those objects to the function
for per-vma work, via madvise_behavior struct.  Make the per-vma logic not
flushes tlb on their own but just saves the tlb entries to the received
mmu_gather object.  For this internal logic change, make
zap_page_range_single_batched() non-static and use it directly from
madvise_dontneed_single_vma().  Finally, the entry level functions flush
the tlb entries that gathered for the entire user request, at once.

Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: SeongJae Park <[email protected]>
Reviewed-by: Lorenzo Stoakes <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

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