arm64/mm: dplit __flush_tlb_range() to elide trailing DSB

Split __flush_tlb_range() into __flush_tlb_range_nosync() +
__flush_tlb_range(), in the same way as the existing flush_tlb_page()
arrangement.  This allows calling __flush_tlb_range_nosync() to elide the
trailing DSB.  Forthcoming "contpte" code will take advantage of this when
clearing the young bit from a contiguous range of ptes.

Ordering between dsb and mmu_notifier_arch_invalidate_secondary_tlbs() has
changed, but now aligns with the ordering of __flush_tlb_page().  It has
been discussed that __flush_tlb_page() may be wrong though.  Regardless,
both will be resolved separately if needed.

Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: Ryan Roberts <[email protected]>
Reviewed-by: David Hildenbrand <[email protected]>
Tested-by: John Hubbard <[email protected]>
Acked-by: Mark Rutland <[email protected]>
Acked-by: Catalin Marinas <[email protected]>
Cc: Alistair Popple <[email protected]>
Cc: Andrey Ryabinin <[email protected]>
Cc: Ard Biesheuvel <[email protected]>
Cc: Barry Song <[email protected]>
Cc: Borislav Petkov (AMD) <[email protected]>
Cc: Dave Hansen <[email protected]>
Cc: "H. Peter Anvin" <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: James Morse <[email protected]>
Cc: Kefeng Wang <[email protected]>
Cc: Marc Zyngier <[email protected]>
Cc: Matthew Wilcox (Oracle) <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Cc: Will Deacon <[email protected]>
Cc: Yang Shi <[email protected]>
Cc: Zi Yan <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

0 files changed, 0 insertions, 0 deletions