powerpc/mm: define an empty slice_init_new_context_exec()

Define slice_init_new_context_exec() at all time to avoid
Signed-off-by: NChristophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: NMichael Ellerman <mpe@ellerman.id.au>

arch/powerpc/include/asm/slice.h

@@ -10,6 +10,10 @@
 #include <asm/nohash/32/slice.h>
 #endif
 
+#ifndef __ASSEMBLY__
+
+struct mm_struct;
+
 #ifdef CONFIG_PPC_MM_SLICES
 
 #ifdef CONFIG_HUGETLB_PAGE
@@ -18,10 +22,6 @@
 #define HAVE_ARCH_UNMAPPED_AREA
 #define HAVE_ARCH_UNMAPPED_AREA_TOPDOWN
 
-#ifndef __ASSEMBLY__
-
-struct mm_struct;
-
 unsigned long slice_get_unmapped_area(unsigned long addr, unsigned long len,
 				      unsigned long flags, unsigned int psize,
 				      int topdown);
@@ -34,8 +34,12 @@ void slice_set_range_psize(struct mm_struct *mm, unsigned long start,
 void slice_init_new_context_exec(struct mm_struct *mm);
 void slice_setup_new_exec(void);
 
-#endif /* __ASSEMBLY__ */
+#else /* CONFIG_PPC_MM_SLICES */
+
+static inline void slice_init_new_context_exec(struct mm_struct *mm) {}
 
 #endif /* CONFIG_PPC_MM_SLICES */
 
+#endif /* __ASSEMBLY__ */
+
 #endif /* _ASM_POWERPC_SLICE_H */

arch/powerpc/mm/mmu_context_nohash.c

@@ -372,7 +372,6 @@ int init_new_context(struct task_struct *t, struct mm_struct *mm)
 {
 	pr_hard("initing context for mm @%p\n", mm);
 
-#ifdef	CONFIG_PPC_MM_SLICES
 	/*
 	 * We have MMU_NO_CONTEXT set to be ~0. Hence check
 	 * explicitly against context.id == 0. This ensures that we properly
@@ -382,7 +381,6 @@ int init_new_context(struct task_struct *t, struct mm_struct *mm)
 	 */
 	if (mm->context.id == 0)
 		slice_init_new_context_exec(mm);
-#endif
 	mm->context.id = MMU_NO_CONTEXT;
 	mm->context.active = 0;
 	pte_frag_set(&mm->context, NULL);