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Commit48478b9f79("arm64/mm: Enable batched TLB flush in unmap_hotplug_range") inadvertently introduced redundant TLB invalidation when clearing a block entry, resulting in unnecessary broadcast invalidation on CPUs without support for range-based invalidation. Re-introduce the old behaviour, along with some expanded comments to help people working in this area next time around. Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Will Deacon <will@kernel.org> Cc: Ryan Roberts <ryan.roberts@arm.com> Cc: David Hildenbrand <david@kernel.org> Cc: linux-arm-kernel@lists.infradead.org Cc: linux-kernel@vger.kernel.org Reported-by: Ben Hutchings <ben@decadent.org.uk> Closes: https://lore.kernel.org/all/b0d5836032ce3135bfc473f6bff791306d086925.camel@decadent.org.uk/ Fixes:48478b9f79("arm64/mm: Enable batched TLB flush in unmap_hotplug_range()") Signed-off-by: Anshuman Khandual <anshuman.khandual@arm.com> Reviewed-by: David Hildenbrand (Arm) <david@kernel.org> Reviewed-by: Catalin Marinas <catalin.marinas@arm.com> [will: Reword comments and commit message] Signed-off-by: Will Deacon <will@kernel.org>