arm64: mm: Add THP TLB entries to general mmu_gather

When arm64 moved over to the core mmu_gather, it lost the logic to
flush THP TLB entries (tlb_remove_pmd_tlb_entry was removed and the
core implementation only signals that the mmu_gather needs a flush).

This patch ensures that tlb_add_flush is called for THP TLB entries.
Signed-off-by: Steve Capper <steve.capper@linaro.org>
Acked-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>

arch/arm64/include/asm/tlb.h

@@ -19,6 +19,7 @@
 #ifndef __ASM_TLB_H
 #define __ASM_TLB_H
 
+#define  __tlb_remove_pmd_tlb_entry __tlb_remove_pmd_tlb_entry
 
 #include <asm-generic/tlb.h>
 
@@ -99,5 +100,10 @@ static inline void __pmd_free_tlb(struct mmu_gather *tlb, pmd_t *pmdp,
 }
 #endif
 
+static inline void __tlb_remove_pmd_tlb_entry(struct mmu_gather *tlb, pmd_t *pmdp,
+						unsigned long address)
+{
+	tlb_add_flush(tlb, address);
+}
 
 #endif