[S390] cpumask: use mm_cpumask() wrapper

Makes code futureproof against the impending change to mm->cpu_vm_mask.

It's also a chance to use the new cpumask_ ops which take a pointer
(the older ones are deprecated, but there's no hurry for arch code).
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

arch/s390/include/asm/mmu_context.h

@@ -74,7 +74,7 @@ static inline void update_mm(struct mm_struct *mm, struct task_struct *tsk)
 static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
 			     struct task_struct *tsk)
 {
-	cpu_set(smp_processor_id(), next->cpu_vm_mask);
+	cpumask_set_cpu(smp_processor_id(), mm_cpumask(next));
 	update_mm(next, tsk);
 }
 

arch/s390/include/asm/tlbflush.h

@@ -51,7 +51,7 @@ static inline void __tlb_flush_full(struct mm_struct *mm)
 	 * If the process only ran on the local cpu, do a local flush.
 	 */
 	local_cpumask = cpumask_of_cpu(smp_processor_id());
-	if (cpus_equal(mm->cpu_vm_mask, local_cpumask))
+	if (cpumask_equal(mm_cpumask(mm), &local_cpumask))
 		__tlb_flush_local();
 	else
 		__tlb_flush_global();
@@ -73,7 +73,7 @@ static inline void __tlb_flush_idte(unsigned long asce)
 
 static inline void __tlb_flush_mm(struct mm_struct * mm)
 {
-	if (unlikely(cpus_empty(mm->cpu_vm_mask)))
+	if (unlikely(cpumask_empty(mm_cpumask(mm))))
 		return;
 	/*
 	 * If the machine has IDTE we prefer to do a per mm flush

arch/s390/mm/pgtable.c

@@ -296,7 +296,7 @@ int s390_enable_sie(void)
 	tsk->mm = tsk->active_mm = mm;
 	preempt_disable();
 	update_mm(mm, tsk);
-	cpu_set(smp_processor_id(), mm->cpu_vm_mask);
+	cpumask_set_cpu(smp_processor_id(), mm_cpumask(mm));
 	preempt_enable();
 	task_unlock(tsk);
 	mmput(old_mm);