microblaze: use asm-generic/mmu_context.h for no-op implementations

Wire asm-generic/mmu_context.h to provide generic empty hooks for arch
code simplification.
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Acked-by: Michal Simek <monstr@monstr.eu>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>

arch/microblaze/include/asm/mmu_context_mm.h

@@ -33,10 +33,6 @@
    to represent all kernel pages as shared among all contexts.
  */
 
-static inline void enter_lazy_tlb(struct mm_struct *mm, struct task_struct *tsk)
-{
-}
-
 # define NO_CONTEXT	256
 # define LAST_CONTEXT	255
 # define FIRST_CONTEXT	1
@@ -105,6 +101,7 @@ static inline void get_mmu_context(struct mm_struct *mm)
 /*
  * We're finished using the context for an address space.
  */
+#define destroy_context destroy_context
 static inline void destroy_context(struct mm_struct *mm)
 {
 	if (mm->context != NO_CONTEXT) {
@@ -126,6 +123,7 @@ static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
  * After we have set current->mm to a new value, this activates
  * the context for the new mm so we see the new mappings.
  */
+#define activate_mm activate_mm
 static inline void activate_mm(struct mm_struct *active_mm,
 			struct mm_struct *mm)
 {
@@ -136,5 +134,7 @@ static inline void activate_mm(struct mm_struct *active_mm,
 
 extern void mmu_context_init(void);
 
+#include <asm-generic/mmu_context.h>
+
 # endif /* __KERNEL__ */
 #endif /* _ASM_MICROBLAZE_MMU_CONTEXT_H */

arch/microblaze/include/asm/processor.h

@@ -122,9 +122,6 @@ unsigned long get_wchan(struct task_struct *p);
 #  define KSTK_EIP(task)	(task_pc(task))
 #  define KSTK_ESP(task)	(task_sp(task))
 
-/* FIXME */
-#  define deactivate_mm(tsk, mm)	do { } while (0)
-
 #  define STACK_TOP	TASK_SIZE
 #  define STACK_TOP_MAX	STACK_TOP