powerpc/mm: cleanup remaining ifdef mess in hugetlbpage.c

Only 3 subarches support huge pages. So when it is either 2 of them,
it is not the third one.

And mmu_has_feature() is known by all subarches so IS_ENABLED() can
be used instead of #ifdef

Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

arch/powerpc/mm/hugetlbpage.c

@@ -226,7 +226,7 @@ int __init alloc_bootmem_huge_page(struct hstate *h)
 	return __alloc_bootmem_huge_page(h);
 }
 
-#if defined(CONFIG_PPC_FSL_BOOK3E) || defined(CONFIG_PPC_8xx)
+#ifndef CONFIG_PPC_BOOK3S_64
 #define HUGEPD_FREELIST_SIZE \
 	((PAGE_SIZE - sizeof(struct hugepd_freelist)) / sizeof(pte_t))
 
@@ -595,10 +595,10 @@ static int __init hugetlbpage_init(void)
 		return 0;
 	}
 
-#if !defined(CONFIG_PPC_FSL_BOOK3E) && !defined(CONFIG_PPC_8xx)
-	if (!radix_enabled() && !mmu_has_feature(MMU_FTR_16M_PAGE))
+	if (IS_ENABLED(CONFIG_PPC_BOOK3S_64) && !radix_enabled() &&
+	    !mmu_has_feature(MMU_FTR_16M_PAGE))
 		return -ENODEV;
-#endif
+
 	for (psize = 0; psize < MMU_PAGE_COUNT; ++psize) {
 		unsigned shift;
 		unsigned pdshift;
@@ -636,10 +636,8 @@ static int __init hugetlbpage_init(void)
 			pgtable_cache_add(PTE_INDEX_SIZE);
 		else if (pdshift > shift)
 			pgtable_cache_add(pdshift - shift);
-#if defined(CONFIG_PPC_FSL_BOOK3E) || defined(CONFIG_PPC_8xx)
-		else
+		else if (IS_ENABLED(CONFIG_PPC_FSL_BOOK3E) || IS_ENABLED(CONFIG_PPC_8xx))
 			pgtable_cache_add(PTE_T_ORDER);
-#endif
 	}
 
 	if (IS_ENABLED(HUGETLB_PAGE_SIZE_VARIABLE))