nodemask: use new node_to_cpumask_ptr function

  * Use new node_to_cpumask_ptr.  This creates a pointer to the
    cpumask for a given node.  This definition is in mm patch:

	asm-generic-add-node_to_cpumask_ptr-macro.patch

  * Use new set_cpus_allowed_ptr function.

Depends on:
	[mm-patch]: asm-generic-add-node_to_cpumask_ptr-macro.patch
	[sched-devel]: sched: add new set_cpus_allowed_ptr function
	[x86/latest]: x86: add cpus_scnprintf function

Cc: Greg Kroah-Hartman <gregkh@suse.de>
Cc: Greg Banks <gnb@melbourne.sgi.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Signed-off-by: Mike Travis <travis@sgi.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

3 files changed, 13 insertions, 16 deletions

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 402a504f1228..32e796af12a1 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -2029,6 +2029,7 @@ static int find_next_best_node(int node, nodemask_t *used_node_mask)
         int n, val;
         int min_val = INT_MAX;
         int best_node = -1;
+        node_to_cpumask_ptr(tmp, 0);
 
         /* Use the local node if we haven't already */
         if (!node_isset(node, *used_node_mask)) {
@@ -2037,7 +2038,6 @@ static int find_next_best_node(int node, nodemask_t *used_node_mask)
         }
 
         for_each_node_state(n, N_HIGH_MEMORY) {
-                cpumask_t tmp;
 
                 /* Don't want a node to appear more than once */
                 if (node_isset(n, *used_node_mask))
@@ -2050,8 +2050,8 @@ static int find_next_best_node(int node, nodemask_t *used_node_mask)
                 val += (n < node);
 
                 /* Give preference to headless and unused nodes */
-                tmp = node_to_cpumask(n);
-                if (!cpus_empty(tmp))
+                node_to_cpumask_ptr_next(tmp, n);
+                if (!cpus_empty(*tmp))
                         val += PENALTY_FOR_NODE_WITH_CPUS;
 
                 /* Slight preference for less loaded node */
diff --git a/mm/slab.c b/mm/slab.c
index 04b308c3bc54..03927cb5ec9e 100644
--- a/mm/slab.c
+++ b/mm/slab.c
@@ -1160,14 +1160,13 @@ static void __cpuinit cpuup_canceled(long cpu)
         struct kmem_cache *cachep;
         struct kmem_list3 *l3 = NULL;
         int node = cpu_to_node(cpu);
+        node_to_cpumask_ptr(mask, node);
 
         list_for_each_entry(cachep, &cache_chain, next) {
                 struct array_cache *nc;
                 struct array_cache *shared;
                 struct array_cache **alien;
-                cpumask_t mask;
 
-                mask = node_to_cpumask(node);
                 /* cpu is dead; no one can alloc from it. */
                 nc = cachep->array[cpu];
                 cachep->array[cpu] = NULL;
@@ -1183,7 +1182,7 @@ static void __cpuinit cpuup_canceled(long cpu)
                 if (nc)
                         free_block(cachep, nc->entry, nc->avail, node);
 
-                if (!cpus_empty(mask)) {
+                if (!cpus_empty(*mask)) {
                         spin_unlock_irq(&l3->list_lock);
                         goto free_array_cache;
                 }
diff --git a/mm/vmscan.c b/mm/vmscan.c
index 4046434046e6..f80a5b7c057f 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -1647,11 +1647,10 @@ static int kswapd(void *p)
         struct reclaim_state reclaim_state = {
                 .reclaimed_slab = 0,
         };
-        cpumask_t cpumask;
+        node_to_cpumask_ptr(cpumask, pgdat->node_id);
 
-        cpumask = node_to_cpumask(pgdat->node_id);
-        if (!cpus_empty(cpumask))
-                set_cpus_allowed(tsk, cpumask);
+        if (!cpus_empty(*cpumask))
+                set_cpus_allowed_ptr(tsk, cpumask);
         current->reclaim_state = &reclaim_state;
 
         /*
@@ -1880,17 +1879,16 @@ out:
 static int __devinit cpu_callback(struct notifier_block *nfb,
                                   unsigned long action, void *hcpu)
 {
-        pg_data_t *pgdat;
-        cpumask_t mask;
         int nid;
 
         if (action == CPU_ONLINE || action == CPU_ONLINE_FROZEN) {
                 for_each_node_state(nid, N_HIGH_MEMORY) {
-                        pgdat = NODE_DATA(nid);
-                        mask = node_to_cpumask(pgdat->node_id);
-                        if (any_online_cpu(mask) != NR_CPUS)
+                        pg_data_t *pgdat = NODE_DATA(nid);
+                        node_to_cpumask_ptr(mask, pgdat->node_id);
+
+                        if (any_online_cpu(*mask) < nr_cpu_ids)
                                 /* One of our CPUs online: restore mask */
-                                set_cpus_allowed(pgdat->kswapd, mask);
+                                set_cpus_allowed_ptr(pgdat->kswapd, mask);
                 }
         }
         return NOTIFY_OK;