[POWERPC] Tidy up CONFIG_PPC_MM_SLICES code

This removes some of the #ifdefs from .c files.
Signed-off-by: NStephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: NPaul Mackerras <paulus@samba.org>

arch/powerpc/mm/hash_utils_64.c

@@ -601,13 +601,7 @@ static void demote_segment_4k(struct mm_struct *mm, unsigned long addr)
 {
 	if (mm->context.user_psize == MMU_PAGE_4K)
 		return;
-#ifdef CONFIG_PPC_MM_SLICES
 	slice_set_user_psize(mm, MMU_PAGE_4K);
-#else /* CONFIG_PPC_MM_SLICES */
-	mm->context.user_psize = MMU_PAGE_4K;
-	mm->context.sllp = SLB_VSID_USER | mmu_psize_defs[MMU_PAGE_4K].sllp;
-#endif /* CONFIG_PPC_MM_SLICES */
-
 #ifdef CONFIG_SPU_BASE
 	spu_flush_all_slbs(mm);
 #endif

arch/powerpc/mm/mmu_context_64.c

@@ -49,18 +49,12 @@ int init_new_context(struct task_struct *tsk, struct mm_struct *mm)
 		return -ENOMEM;
 	}
 
-#ifdef CONFIG_PPC_MM_SLICES
 	/* The old code would re-promote on fork, we don't do that
 	 * when using slices as it could cause problem promoting slices
 	 * that have been forced down to 4K
 	 */
-	if (mm->context.id == 0)
+	if (slice_mm_new_context(mm))
 		slice_set_user_psize(mm, mmu_virtual_psize);
-#else
-	mm->context.user_psize = mmu_virtual_psize;
-	mm->context.sllp = SLB_VSID_USER |
-		mmu_psize_defs[mmu_virtual_psize].sllp;
-#endif
 	mm->context.id = index;
 
 	return 0;

include/asm-powerpc/page_64.h

@@ -121,6 +121,7 @@ extern unsigned int get_slice_psize(struct mm_struct *mm,
 
 extern void slice_init_context(struct mm_struct *mm, unsigned int psize);
 extern void slice_set_user_psize(struct mm_struct *mm, unsigned int psize);
+#define slice_mm_new_context(mm)	((mm)->context.id == 0)
 
 #define ARCH_HAS_HUGEPAGE_ONLY_RANGE
 extern int is_hugepage_only_range(struct mm_struct *m,
@@ -130,6 +131,12 @@ extern int is_hugepage_only_range(struct mm_struct *m,
 #endif /* __ASSEMBLY__ */
 #else
 #define slice_init()
+#define slice_set_user_psize(mm, psize)		\
+do {						\
+	(mm)->context.user_psize = (psize);	\
+	(mm)->context.sllp = SLB_VSID_USER | mmu_psize_defs[(psize)].sllp; \
+} while (0)
+#define slice_mm_new_context(mm)	1
 #endif /* CONFIG_PPC_MM_SLICES */
 
 #ifdef CONFIG_HUGETLB_PAGE