mm/tlbbatch: introduce arch_flush_tlb_batched_pending()

Currently we'll flush the mm in flush_tlb_batched_pending() to avoid race
between reclaim unmaps pages by batched TLB flush and mprotect/munmap/etc.
Other architectures like arm64 may only need a synchronization
barrier(dsb) here rather than a full mm flush.  So add
arch_flush_tlb_batched_pending() to allow an arch-specific implementation
here.  This intends no functional changes on x86 since still a full mm
flush for x86.

Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: Yicong Yang <[email protected]>
Reviewed-by: Catalin Marinas <[email protected]>
Cc: Anshuman Khandual <[email protected]>
Cc: Anshuman Khandual <[email protected]>
Cc: Arnd Bergmann <[email protected]>
Cc: Barry Song <[email protected]>
Cc: Barry Song <[email protected]>
Cc: Darren Hart <[email protected]>
Cc: Jonathan Cameron <[email protected]>
Cc: Jonathan Corbet <[email protected]>
Cc: Kefeng Wang <[email protected]>
Cc: lipeifeng <[email protected]>
Cc: Mark Rutland <[email protected]>
Cc: Mel Gorman <[email protected]>
Cc: Nadav Amit <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Punit Agrawal <[email protected]>
Cc: Ryan Roberts <[email protected]>
Cc: Steven Miao <[email protected]>
Cc: Will Deacon <[email protected]>
Cc: Xin Hao <[email protected]>
Cc: Zeng Tao <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

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