powerpc/mm/slice: remove radix calls to the slice code

This is a tidy up which removes radix MMU calls into the slice
code.
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

arch/powerpc/include/asm/hugetlb.h

@@ -89,17 +89,17 @@ pte_t *huge_pte_offset_and_shift(struct mm_struct *mm,
 
 void flush_dcache_icache_hugepage(struct page *page);
 
-#if defined(CONFIG_PPC_MM_SLICES)
-int is_hugepage_only_range(struct mm_struct *mm, unsigned long addr,
+int slice_is_hugepage_only_range(struct mm_struct *mm, unsigned long addr,
 			   unsigned long len);
-#else
+
 static inline int is_hugepage_only_range(struct mm_struct *mm,
 					 unsigned long addr,
 					 unsigned long len)
 {
+	if (IS_ENABLED(CONFIG_PPC_MM_SLICES) && !radix_enabled())
+		return slice_is_hugepage_only_range(mm, addr, len);
 	return 0;
 }
-#endif
 
 void book3e_hugetlb_preload(struct vm_area_struct *vma, unsigned long ea,
 			    pte_t pte);

arch/powerpc/mm/hugetlbpage.c

@@ -565,10 +565,12 @@ unsigned long hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
 unsigned long vma_mmu_pagesize(struct vm_area_struct *vma)
 {
 #ifdef CONFIG_PPC_MM_SLICES
-	unsigned int psize = get_slice_psize(vma->vm_mm, vma->vm_start);
 	/* With radix we don't use slice, so derive it from vma*/
-	if (!radix_enabled())
+	if (!radix_enabled()) {
+		unsigned int psize = get_slice_psize(vma->vm_mm, vma->vm_start);
+
 		return 1UL << mmu_psize_to_shift(psize);
+	}
 #endif
 	if (!is_vm_hugetlb_page(vma))
 		return PAGE_SIZE;

arch/powerpc/mm/slice.c

@@ -686,16 +686,8 @@ unsigned int get_slice_psize(struct mm_struct *mm, unsigned long addr)
 	unsigned char *psizes;
 	int index, mask_index;
 
-	/*
-	 * Radix doesn't use slice, but can get enabled along with MMU_SLICE
-	 */
-	if (radix_enabled()) {
-#ifdef CONFIG_PPC_64K_PAGES
-		return MMU_PAGE_64K;
-#else
-		return MMU_PAGE_4K;
-#endif
-	}
+	VM_BUG_ON(radix_enabled());
+
 	if (addr < SLICE_LOW_TOP) {
 		psizes = mm->context.low_slices_psize;
 		index = GET_LOW_SLICE_INDEX(addr);
@@ -778,14 +770,13 @@ void slice_set_range_psize(struct mm_struct *mm, unsigned long start,
  * for now as we only use slices with hugetlbfs enabled. This should
  * be fixed as the generic code gets fixed.
  */
-int is_hugepage_only_range(struct mm_struct *mm, unsigned long addr,
+int slice_is_hugepage_only_range(struct mm_struct *mm, unsigned long addr,
 			   unsigned long len)
 {
 	const struct slice_mask *maskp;
 	unsigned int psize = mm->context.user_psize;
 
-	if (radix_enabled())
-		return 0;
+	VM_BUG_ON(radix_enabled());
 
 	maskp = slice_mask_for_size(mm, psize);
 #ifdef CONFIG_PPC_64K_PAGES