numa: make "nr_node_ids" unsigned int

Number of NUMA nodes can't be negative.

This saves a few bytes on x86_64:

	add/remove: 0/0 grow/shrink: 4/21 up/down: 27/-265 (-238)
	Function                                     old     new   delta
	hv_synic_alloc.cold                           88     110     +22
	prealloc_shrinker                            260     262      +2
	bootstrap                                    249     251      +2
	sched_init_numa                             1566    1567      +1
	show_slab_objects                            778     777      -1
	s_show                                      1201    1200      -1
	kmem_cache_init                              346     345      -1
	__alloc_workqueue_key                       1146    1145      -1
	mem_cgroup_css_alloc                        1614    1612      -2
	__do_sys_swapon                             4702    4699      -3
	__list_lru_init                              655     651      -4
	nic_probe                                   2379    2374      -5
	store_user_store                             118     111      -7
	red_zone_store                               106      99      -7
	poison_store                                 106      99      -7
	wq_numa_init                                 348     338     -10
	__kmem_cache_empty                            75      65     -10
	task_numa_free                               186     173     -13
	merge_across_nodes_store                     351     336     -15
	irq_create_affinity_masks                   1261    1246     -15
	do_numa_crng_init                            343     321     -22
	task_numa_fault                             4760    4737     -23
	swapfile_init                                179     156     -23
	hv_synic_alloc                               536     492     -44
	apply_wqattrs_prepare                        746     695     -51

Link: http://lkml.kernel.org/r/20190201223029.GA15820@avx2
Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Reviewed-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

12 files changed, 14 insertions, 16 deletions

diff --git a/arch/arm64/mm/numa.c b/arch/arm64/mm/numa.c
index ae34e3a1cef1..7a0a555b366a 100644
--- a/arch/arm64/mm/numa.c
+++ b/arch/arm64/mm/numa.c
@@ -120,7 +120,7 @@ static void __init setup_node_to_cpumask_map(void)
         }
 
         /* cpumask_of_node() will now work */
-        pr_debug("Node to cpumask map for %d nodes\n", nr_node_ids);
+        pr_debug("Node to cpumask map for %u nodes\n", nr_node_ids);
 }
 
 /*
diff --git a/arch/powerpc/mm/numa.c b/arch/powerpc/mm/numa.c
index 270cefb75cca..df1e11ebbabb 100644
--- a/arch/powerpc/mm/numa.c
+++ b/arch/powerpc/mm/numa.c
@@ -84,7 +84,7 @@ static void __init setup_node_to_cpumask_map(void)
                 alloc_bootmem_cpumask_var(&node_to_cpumask_map[node]);
 
         /* cpumask_of_node() will now work */
-        dbg("Node to cpumask map for %d nodes\n", nr_node_ids);
+        dbg("Node to cpumask map for %u nodes\n", nr_node_ids);
 }
 
 static int __init fake_numa_create_new_node(unsigned long end_pfn,
diff --git a/arch/x86/kernel/setup_percpu.c b/arch/x86/kernel/setup_percpu.c
index e8796fcd7e5a..13af08827eef 100644
--- a/arch/x86/kernel/setup_percpu.c
+++ b/arch/x86/kernel/setup_percpu.c
@@ -171,7 +171,7 @@ void __init setup_per_cpu_areas(void)
         unsigned long delta;
         int rc;
 
-        pr_info("NR_CPUS:%d nr_cpumask_bits:%d nr_cpu_ids:%u nr_node_ids:%d\n",
+        pr_info("NR_CPUS:%d nr_cpumask_bits:%d nr_cpu_ids:%u nr_node_ids:%u\n",
                 NR_CPUS, nr_cpumask_bits, nr_cpu_ids, nr_node_ids);
 
         /*
diff --git a/arch/x86/mm/numa.c b/arch/x86/mm/numa.c
index 1308f5408bf7..12c1b7a83ed7 100644
--- a/arch/x86/mm/numa.c
+++ b/arch/x86/mm/numa.c
@@ -123,7 +123,7 @@ void __init setup_node_to_cpumask_map(void)
                 alloc_bootmem_cpumask_var(&node_to_cpumask_map[node]);
 
         /* cpumask_of_node() will now work */
-        pr_debug("Node to cpumask map for %d nodes\n", nr_node_ids);
+        pr_debug("Node to cpumask map for %u nodes\n", nr_node_ids);
 }
 
 static int __init numa_add_memblk_to(int nid, u64 start, u64 end,
@@ -866,7 +866,7 @@ const struct cpumask *cpumask_of_node(int node)
 {
         if (node >= nr_node_ids) {
                 printk(KERN_WARNING
-                        "cpumask_of_node(%d): node > nr_node_ids(%d)\n",
+                        "cpumask_of_node(%d): node > nr_node_ids(%u)\n",
                         node, nr_node_ids);
                 dump_stack();
                 return cpu_none_mask;
diff --git a/include/linux/nodemask.h b/include/linux/nodemask.h
index 5a30ad594ccc..962c5e783d50 100644
--- a/include/linux/nodemask.h
+++ b/include/linux/nodemask.h
@@ -444,7 +444,7 @@ static inline int next_memory_node(int nid)
         return next_node(nid, node_states[N_MEMORY]);
 }
 
-extern int nr_node_ids;
+extern unsigned int nr_node_ids;
 extern int nr_online_nodes;
 
 static inline void node_set_online(int nid)
@@ -485,7 +485,7 @@ static inline int num_node_state(enum node_states state)
 #define first_online_node       0
 #define first_memory_node       0
 #define next_online_node(nid)   (MAX_NUMNODES)
-#define nr_node_ids             1
+#define nr_node_ids             1U
 #define nr_online_nodes         1
 
 #define node_set_online(node)      node_set_state((node), N_ONLINE)
diff --git a/mm/list_lru.c b/mm/list_lru.c
index 5b30625fd365..0730bf8ff39f 100644
--- a/mm/list_lru.c
+++ b/mm/list_lru.c
@@ -601,7 +601,6 @@ int __list_lru_init(struct list_lru *lru, bool memcg_aware,
                     struct lock_class_key *key, struct shrinker *shrinker)
 {
         int i;
-        size_t size = sizeof(*lru->node) * nr_node_ids;
         int err = -ENOMEM;
 
 #ifdef CONFIG_MEMCG_KMEM
@@ -612,7 +611,7 @@ int __list_lru_init(struct list_lru *lru, bool memcg_aware,
 #endif
         memcg_get_cache_ids();
 
-        lru->node = kzalloc(size, GFP_KERNEL);
+        lru->node = kcalloc(nr_node_ids, sizeof(*lru->node), GFP_KERNEL);
         if (!lru->node)
                 goto out;
 
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 30bda8d7fb5c..45cd1f84268a 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -4429,7 +4429,7 @@ static void mem_cgroup_free(struct mem_cgroup *memcg)
 static struct mem_cgroup *mem_cgroup_alloc(void)
 {
         struct mem_cgroup *memcg;
-        size_t size;
+        unsigned int size;
         int node;
 
         size = sizeof(struct mem_cgroup);
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 11a5f50efd97..8df43caf2eb7 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -289,7 +289,7 @@ EXPORT_SYMBOL(movable_zone);
 #endif /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */
 
 #if MAX_NUMNODES > 1
-int nr_node_ids __read_mostly = MAX_NUMNODES;
+unsigned int nr_node_ids __read_mostly = MAX_NUMNODES;
 int nr_online_nodes __read_mostly = 1;
 EXPORT_SYMBOL(nr_node_ids);
 EXPORT_SYMBOL(nr_online_nodes);
diff --git a/mm/slab.c b/mm/slab.c
index 757e646baa5d..7510a1b489df 100644
--- a/mm/slab.c
+++ b/mm/slab.c
@@ -677,12 +677,11 @@ static struct alien_cache *__alloc_alien_cache(int node, int entries,
 static struct alien_cache **alloc_alien_cache(int node, int limit, gfp_t gfp)
 {
         struct alien_cache **alc_ptr;
-        size_t memsize = sizeof(void *) * nr_node_ids;
         int i;
 
         if (limit > 1)
                 limit = 12;
-        alc_ptr = kzalloc_node(memsize, gfp, node);
+        alc_ptr = kcalloc_node(nr_node_ids, sizeof(void *), gfp, node);
         if (!alc_ptr)
                 return NULL;
 
diff --git a/mm/slub.c b/mm/slub.c
index 017a2ce5ba23..1b08fbcb7e61 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -4262,7 +4262,7 @@ void __init kmem_cache_init(void)
         cpuhp_setup_state_nocalls(CPUHP_SLUB_DEAD, "slub:dead", NULL,
                                   slub_cpu_dead);
 
-        pr_info("SLUB: HWalign=%d, Order=%u-%u, MinObjects=%u, CPUs=%u, Nodes=%d\n",
+        pr_info("SLUB: HWalign=%d, Order=%u-%u, MinObjects=%u, CPUs=%u, Nodes=%u\n",
                 cache_line_size(),
                 slub_min_order, slub_max_order, slub_min_objects,
                 nr_cpu_ids, nr_node_ids);
diff --git a/mm/swapfile.c b/mm/swapfile.c
index 57e9b1b31d55..a14257ac0476 100644
--- a/mm/swapfile.c
+++ b/mm/swapfile.c
@@ -2713,7 +2713,7 @@ static struct swap_info_struct *alloc_swap_info(void)
         struct swap_info_struct *p;
         unsigned int type;
         int i;
-        int size = sizeof(*p) + nr_node_ids * sizeof(struct plist_node);
+        unsigned int size = sizeof(*p) + nr_node_ids * sizeof(struct plist_node);
 
         p = kvzalloc(size, GFP_KERNEL);
         if (!p)
diff --git a/mm/vmscan.c b/mm/vmscan.c
index 209c2c78a087..e1f7ccdc0a90 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -374,7 +374,7 @@ unsigned long lruvec_lru_size(struct lruvec *lruvec, enum lru_list lru, int zone
  */
 int prealloc_shrinker(struct shrinker *shrinker)
 {
-        size_t size = sizeof(*shrinker->nr_deferred);
+        unsigned int size = sizeof(*shrinker->nr_deferred);
 
         if (shrinker->flags & SHRINKER_NUMA_AWARE)
                 size *= nr_node_ids;