cpumask: Use mm_cpumask() wrapper instead of cpu_vm_mask

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: Benjamin Herrenschmidt <benh@kernel.crashing.org>

arch/powerpc/include/asm/mmu_context.h

@@ -31,7 +31,7 @@ static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
 			     struct task_struct *tsk)
 {
 	/* Mark this context has been used on the new CPU */
-	cpu_set(smp_processor_id(), next->cpu_vm_mask);
+	cpumask_set_cpu(smp_processor_id(), mm_cpumask(next));
 
 	/* 32-bit keeps track of the current PGDIR in the thread struct */
 #ifdef CONFIG_PPC32

arch/powerpc/mm/hash_utils_64.c

@@ -859,7 +859,7 @@ int hash_page(unsigned long ea, unsigned long access, unsigned long trap)
 	unsigned long vsid;
 	struct mm_struct *mm;
 	pte_t *ptep;
-	cpumask_t tmp;
+	const struct cpumask *tmp;
 	int rc, user_region = 0, local = 0;
 	int psize, ssize;
 
@@ -907,8 +907,8 @@ int hash_page(unsigned long ea, unsigned long access, unsigned long trap)
 		return 1;
 
 	/* Check CPU locality */
-	tmp = cpumask_of_cpu(smp_processor_id());
-	if (user_region && cpus_equal(mm->cpu_vm_mask, tmp))
+	tmp = cpumask_of(smp_processor_id());
+	if (user_region && cpumask_equal(mm_cpumask(mm), tmp))
 		local = 1;
 
 #ifdef CONFIG_HUGETLB_PAGE
@@ -1024,7 +1024,6 @@ void hash_preload(struct mm_struct *mm, unsigned long ea,
 	unsigned long vsid;
 	void *pgdir;
 	pte_t *ptep;
-	cpumask_t mask;
 	unsigned long flags;
 	int local = 0;
 	int ssize;
@@ -1067,8 +1066,7 @@ void hash_preload(struct mm_struct *mm, unsigned long ea,
 	local_irq_save(flags);
 
 	/* Is that local to this CPU ? */
-	mask = cpumask_of_cpu(smp_processor_id());
-	if (cpus_equal(mm->cpu_vm_mask, mask))
+	if (cpumask_equal(mm_cpumask(mm), cpumask_of(smp_processor_id())))
 		local = 1;
 
 	/* Hash it in */

arch/powerpc/mm/mmu_context_nohash.c

@@ -97,7 +97,7 @@ static unsigned int steal_context_smp(unsigned int id)
 		mm->context.id = MMU_NO_CONTEXT;
 
 		/* Mark it stale on all CPUs that used this mm */
-		for_each_cpu_mask_nr(cpu, mm->cpu_vm_mask)
+		for_each_cpu(cpu, mm_cpumask(mm))
 			__set_bit(id, stale_map[cpu]);
 		return id;
 	}

arch/powerpc/mm/pgtable.c

@@ -82,11 +82,10 @@ static void pte_free_submit(struct pte_freelist_batch *batch)
 void pgtable_free_tlb(struct mmu_gather *tlb, pgtable_free_t pgf)
 {
 	/* This is safe since tlb_gather_mmu has disabled preemption */
-        cpumask_t local_cpumask = cpumask_of_cpu(smp_processor_id());
 	struct pte_freelist_batch **batchp = &__get_cpu_var(pte_freelist_cur);
 
 	if (atomic_read(&tlb->mm->mm_users) < 2 ||
-	    cpus_equal(tlb->mm->cpu_vm_mask, local_cpumask)) {
+	    cpumask_equal(mm_cpumask(tlb->mm), cpumask_of(smp_processor_id()))){
 		pgtable_free(pgf);
 		return;
 	}

arch/powerpc/mm/tlb_hash64.c

@@ -139,12 +139,12 @@ void hpte_need_flush(struct mm_struct *mm, unsigned long addr,
  */
 void __flush_tlb_pending(struct ppc64_tlb_batch *batch)
 {
-	cpumask_t tmp;
+	const struct cpumask *tmp;
 	int i, local = 0;
 
 	i = batch->index;
-	tmp = cpumask_of_cpu(smp_processor_id());
-	if (cpus_equal(batch->mm->cpu_vm_mask, tmp))
+	tmp = cpumask_of(smp_processor_id());
+	if (cpumask_equal(mm_cpumask(batch->mm), tmp))
 		local = 1;
 	if (i == 1)
 		flush_hash_page(batch->vaddr[0], batch->pte[0],

arch/powerpc/mm/tlb_nohash.c

@@ -132,11 +132,11 @@ void flush_tlb_mm(struct mm_struct *mm)
 	pid = mm->context.id;
 	if (unlikely(pid == MMU_NO_CONTEXT))
 		goto no_context;
-	cpu_mask = mm->cpu_vm_mask;
-	cpu_clear(smp_processor_id(), cpu_mask);
-	if (!cpus_empty(cpu_mask)) {
+	if (!cpumask_equal(mm_cpumask(mm), cpumask_of(smp_processor_id()))) {
 		struct tlb_flush_param p = { .pid = pid };
-		smp_call_function_mask(cpu_mask, do_flush_tlb_mm_ipi, &p, 1);
+		/* Ignores smp_processor_id() even if set. */
+		smp_call_function_many(mm_cpumask(mm),
+				       do_flush_tlb_mm_ipi, &p, 1);
 	}
 	_tlbil_pid(pid);
  no_context:
@@ -146,16 +146,15 @@ EXPORT_SYMBOL(flush_tlb_mm);
 
 void flush_tlb_page(struct vm_area_struct *vma, unsigned long vmaddr)
 {
-	cpumask_t cpu_mask;
+	struct cpumask *cpu_mask;
 	unsigned int pid;
 
 	preempt_disable();
 	pid = vma ? vma->vm_mm->context.id : 0;
 	if (unlikely(pid == MMU_NO_CONTEXT))
 		goto bail;
-	cpu_mask = vma->vm_mm->cpu_vm_mask;
-	cpu_clear(smp_processor_id(), cpu_mask);
-	if (!cpus_empty(cpu_mask)) {
+	cpu_mask = mm_cpumask(vma->vm_mm);
+	if (!cpumask_equal(cpu_mask, cpumask_of(smp_processor_id()))) {
 		/* If broadcast tlbivax is supported, use it */
 		if (mmu_has_feature(MMU_FTR_USE_TLBIVAX_BCAST)) {
 			int lock = mmu_has_feature(MMU_FTR_LOCK_BCAST_INVAL);
@@ -167,7 +166,8 @@ void flush_tlb_page(struct vm_area_struct *vma, unsigned long vmaddr)
 			goto bail;
 		} else {
 			struct tlb_flush_param p = { .pid = pid, .addr = vmaddr };
-			smp_call_function_mask(cpu_mask,
+			/* Ignores smp_processor_id() even if set in cpu_mask */
+			smp_call_function_many(cpu_mask,
 					       do_flush_tlb_page_ipi, &p, 1);
 		}
 	}

arch/powerpc/platforms/cell/spu_base.c

@@ -114,7 +114,7 @@ static inline void mm_needs_global_tlbie(struct mm_struct *mm)
 	int nr = (NR_CPUS > 1) ? NR_CPUS : NR_CPUS + 1;
 
 	/* Global TLBIE broadcast required with SPEs. */
-	__cpus_setall(&mm->cpu_vm_mask, nr);
+	bitmap_fill(cpumask_bits(mm_cpumask(mm)), nr);
 }
 
 void spu_associate_mm(struct spu *spu, struct mm_struct *mm)