powerpc/nohash: Refactor pte_clear()

pte_clear() are doing the same on nohash/32 and nohash/64,

Keep the static inline version of nohash/64, make it common and
remove the macro version of nohash/32.
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/818f7df83d7e9e18f55e274cd3c44f2871ade4dd.1695659959.git.christophe.leroy@csgroup.eu

arch/powerpc/include/asm/nohash/32/pgtable.h

@@ -153,9 +153,6 @@
 
 #ifndef __ASSEMBLY__
 
-#define pte_clear(mm, addr, ptep) \
-	do { pte_update(mm, addr, ptep, ~0, 0, 0); } while (0)
-
 #define pmd_none(pmd)		(!pmd_val(pmd))
 #define	pmd_bad(pmd)		(pmd_val(pmd) & _PMD_BAD)
 #define	pmd_present(pmd)	(pmd_val(pmd) & _PMD_PRESENT_MASK)

arch/powerpc/include/asm/nohash/64/pgtable.h

@@ -159,13 +159,6 @@ static inline void huge_ptep_set_wrprotect(struct mm_struct *mm,
 	__young;							\
 })
 
-static inline void pte_clear(struct mm_struct *mm, unsigned long addr,
-			     pte_t * ptep)
-{
-	pte_update(mm, addr, ptep, ~0UL, 0, 0);
-}
-
-
 /* Set the dirty and/or accessed bits atomically in a linux PTE */
 static inline void __ptep_set_access_flags(struct vm_area_struct *vma,
 					   pte_t *ptep, pte_t entry,

arch/powerpc/include/asm/nohash/pgtable.h

@@ -96,6 +96,11 @@ static inline pte_t ptep_get_and_clear(struct mm_struct *mm, unsigned long addr,
 }
 #define __HAVE_ARCH_PTEP_GET_AND_CLEAR
 
+static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
+{
+	pte_update(mm, addr, ptep, ~0UL, 0, 0);
+}
+
 /* Generic accessors to PTE bits */
 #ifndef pte_mkwrite_novma
 static inline pte_t pte_mkwrite_novma(pte_t pte)