powerpc/64s/radix: tlb do not flush on page size when fullmm

When the mm is being torn down there will be a full PID flush so
there is no need to flush the TLB on page size changes.

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Reviewed-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

arch/powerpc/include/asm/tlb.h

@@ -49,6 +49,9 @@ static inline void __tlb_remove_tlb_entry(struct mmu_gather *tlb, pte_t *ptep,
 static inline void tlb_remove_check_page_size_change(struct mmu_gather *tlb,
 						     unsigned int page_size)
 {
+	if (tlb->fullmm)
+		return;
+
 	if (!tlb->page_size)
 		tlb->page_size = page_size;
 	else if (tlb->page_size != page_size) {