powerpc/mm/book3s: Rename hash specific PTE bits to carry H_ prefix

This helps to make following hash only pte bits easier.

We have kept _PAGE_CHG_MASK, _HPAGE_CHG_MASK and _PAGE_PROT_BITS as it
is in this patch eventhough they use hash specific bits. Using them in
radix as it is should be ok, because with radix we expect those bit
positions to be zero.

Only renames in this patch, no change in functionality.

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

arch/powerpc/mm/hash64_4k.c

@@ -34,7 +34,7 @@ int __hash_page_4K(unsigned long ea, unsigned long access, unsigned long vsid,
 
 		old_pte = pte_val(pte);
 		/* If PTE busy, retry the access */
-		if (unlikely(old_pte & _PAGE_BUSY))
+		if (unlikely(old_pte & H_PAGE_BUSY))
 			return 0;
 		/* If PTE permissions don't match, take page fault */
 		if (unlikely(!check_pte_access(access, old_pte)))
@@ -42,9 +42,9 @@ int __hash_page_4K(unsigned long ea, unsigned long access, unsigned long vsid,
 		/*
 		 * Try to lock the PTE, add ACCESSED and DIRTY if it was
 		 * a write access. Since this is 4K insert of 64K page size
-		 * also add _PAGE_COMBO
+		 * also add H_PAGE_COMBO
 		 */
-		new_pte = old_pte | _PAGE_BUSY | _PAGE_ACCESSED;
+		new_pte = old_pte | H_PAGE_BUSY | _PAGE_ACCESSED;
 		if (access & _PAGE_WRITE)
 			new_pte |= _PAGE_DIRTY;
 	} while (!pte_xchg(ptep, __pte(old_pte), __pte(new_pte)));
@@ -60,22 +60,22 @@ int __hash_page_4K(unsigned long ea, unsigned long access, unsigned long vsid,
 		rflags = hash_page_do_lazy_icache(rflags, __pte(old_pte), trap);
 
 	vpn  = hpt_vpn(ea, vsid, ssize);
-	if (unlikely(old_pte & _PAGE_HASHPTE)) {
+	if (unlikely(old_pte & H_PAGE_HASHPTE)) {
 		/*
 		 * There MIGHT be an HPTE for this pte
 		 */
 		hash = hpt_hash(vpn, shift, ssize);
-		if (old_pte & _PAGE_F_SECOND)
+		if (old_pte & H_PAGE_F_SECOND)
 			hash = ~hash;
 		slot = (hash & htab_hash_mask) * HPTES_PER_GROUP;
-		slot += (old_pte & _PAGE_F_GIX) >> _PAGE_F_GIX_SHIFT;
+		slot += (old_pte & H_PAGE_F_GIX) >> H_PAGE_F_GIX_SHIFT;
 
 		if (ppc_md.hpte_updatepp(slot, rflags, vpn, MMU_PAGE_4K,
 					 MMU_PAGE_4K, ssize, flags) == -1)
 			old_pte &= ~_PAGE_HPTEFLAGS;
 	}
 
-	if (likely(!(old_pte & _PAGE_HASHPTE))) {
+	if (likely(!(old_pte & H_PAGE_HASHPTE))) {
 
 		pa = pte_pfn(__pte(old_pte)) << PAGE_SHIFT;
 		hash = hpt_hash(vpn, shift, ssize);
@@ -115,9 +115,10 @@ repeat:
 					   MMU_PAGE_4K, MMU_PAGE_4K, old_pte);
 			return -1;
 		}
-		new_pte = (new_pte & ~_PAGE_HPTEFLAGS) | _PAGE_HASHPTE;
-		new_pte |= (slot << _PAGE_F_GIX_SHIFT) & (_PAGE_F_SECOND | _PAGE_F_GIX);
+		new_pte = (new_pte & ~_PAGE_HPTEFLAGS) | H_PAGE_HASHPTE;
+		new_pte |= (slot << H_PAGE_F_GIX_SHIFT) &
+			(H_PAGE_F_SECOND | H_PAGE_F_GIX);
 	}
-	*ptep = __pte(new_pte & ~_PAGE_BUSY);
+	*ptep = __pte(new_pte & ~H_PAGE_BUSY);
 	return 0;
 }