3 files changed, 77 insertions, 61 deletions

diff --git a/init/main.c b/init/main.c
index bb7dc57eee36..0ab82a453de5 100644
--- a/init/main.c
+++ b/init/main.c
@@ -574,6 +574,28 @@ asmlinkage void __init start_kernel(void)
         setup_nr_cpu_ids();
         smp_prepare_boot_cpu(); /* arch-specific boot-cpu hooks */
 
+        build_all_zonelists();
+        page_alloc_init();
+
+        printk(KERN_NOTICE "Kernel command line: %s\n", boot_command_line);
+        parse_early_param();
+        parse_args("Booting kernel", static_command_line, __start___param,
+                   __stop___param - __start___param,
+                   &unknown_bootoption);
+        /*
+         * These use large bootmem allocations and must precede
+         * kmem_cache_init()
+         */
+        pidhash_init();
+        vmalloc_init();
+        vfs_caches_init_early();
+        sort_main_extable();
+        trap_init();
+        /*
+         * Set up kernel memory allocators
+         */
+        mem_init();
+        kmem_cache_init();
         /*
          * Set up the scheduler prior starting any interrupts (such as the
          * timer interrupt). Full topology setup happens at smp_init()
@@ -585,25 +607,15 @@ asmlinkage void __init start_kernel(void)
          * fragile until we cpu_idle() for the first time.
          */
         preempt_disable();
-        build_all_zonelists();
-        page_alloc_init();
-        printk(KERN_NOTICE "Kernel command line: %s\n", boot_command_line);
-        parse_early_param();
-        parse_args("Booting kernel", static_command_line, __start___param,
-                   __stop___param - __start___param,
-                   &unknown_bootoption);
         if (!irqs_disabled()) {
                 printk(KERN_WARNING "start_kernel(): bug: interrupts were "
                                 "enabled *very* early, fixing it\n");
                 local_irq_disable();
         }
-        sort_main_extable();
-        trap_init();
         rcu_init();
         /* init some links before init_ISA_irqs() */
         early_irq_init();
         init_IRQ();
-        pidhash_init();
         init_timers();
         hrtimers_init();
         softirq_init();
@@ -645,14 +657,10 @@ asmlinkage void __init start_kernel(void)
                 initrd_start = 0;
         }
 #endif
-        vmalloc_init();
-        vfs_caches_init_early();
         cpuset_init_early();
         page_cgroup_init();
-        mem_init();
         enable_debug_pagealloc();
         cpu_hotplug_init();
-        kmem_cache_init();
         kmemtrace_init();
         debug_objects_mem_init();
         idr_init_cache();
diff --git a/mm/slab.c b/mm/slab.c
index f85831da9080..2bd611fa87bf 100644
--- a/mm/slab.c
+++ b/mm/slab.c
@@ -315,7 +315,7 @@ static int drain_freelist(struct kmem_cache *cache,
                         struct kmem_list3 *l3, int tofree);
 static void free_block(struct kmem_cache *cachep, void **objpp, int len,
                         int node);
-static int enable_cpucache(struct kmem_cache *cachep);
+static int enable_cpucache(struct kmem_cache *cachep, gfp_t gfp);
 static void cache_reap(struct work_struct *unused);
 
 /*
@@ -958,12 +958,12 @@ static void __cpuinit start_cpu_timer(int cpu)
 }
 
 static struct array_cache *alloc_arraycache(int node, int entries,
-                                            int batchcount)
+                                            int batchcount, gfp_t gfp)
 {
         int memsize = sizeof(void *) * entries + sizeof(struct array_cache);
         struct array_cache *nc = NULL;
 
-        nc = kmalloc_node(memsize, GFP_KERNEL, node);
+        nc = kmalloc_node(memsize, gfp, node);
         if (nc) {
                 nc->avail = 0;
                 nc->limit = entries;
@@ -1003,7 +1003,7 @@ static int transfer_objects(struct array_cache *to,
 #define drain_alien_cache(cachep, alien) do { } while (0)
 #define reap_alien(cachep, l3) do { } while (0)
 
-static inline struct array_cache **alloc_alien_cache(int node, int limit)
+static inline struct array_cache **alloc_alien_cache(int node, int limit, gfp_t gfp)
 {
         return (struct array_cache **)BAD_ALIEN_MAGIC;
 }
@@ -1034,7 +1034,7 @@ static inline void *____cache_alloc_node(struct kmem_cache *cachep,
 static void *____cache_alloc_node(struct kmem_cache *, gfp_t, int);
 static void *alternate_node_alloc(struct kmem_cache *, gfp_t);
 
-static struct array_cache **alloc_alien_cache(int node, int limit)
+static struct array_cache **alloc_alien_cache(int node, int limit, gfp_t gfp)
 {
         struct array_cache **ac_ptr;
         int memsize = sizeof(void *) * nr_node_ids;
@@ -1042,14 +1042,14 @@ static struct array_cache **alloc_alien_cache(int node, int limit)
 
         if (limit > 1)
                 limit = 12;
-        ac_ptr = kmalloc_node(memsize, GFP_KERNEL, node);
+        ac_ptr = kmalloc_node(memsize, gfp, node);
         if (ac_ptr) {
                 for_each_node(i) {
                         if (i == node || !node_online(i)) {
                                 ac_ptr[i] = NULL;
                                 continue;
                         }
-                        ac_ptr[i] = alloc_arraycache(node, limit, 0xbaadf00d);
+                        ac_ptr[i] = alloc_arraycache(node, limit, 0xbaadf00d, gfp);
                         if (!ac_ptr[i]) {
                                 for (i--; i >= 0; i--)
                                         kfree(ac_ptr[i]);
@@ -1282,20 +1282,20 @@ static int __cpuinit cpuup_prepare(long cpu)
                 struct array_cache **alien = NULL;
 
                 nc = alloc_arraycache(node, cachep->limit,
-                                        cachep->batchcount);
+                                        cachep->batchcount, GFP_KERNEL);
                 if (!nc)
                         goto bad;
                 if (cachep->shared) {
                         shared = alloc_arraycache(node,
                                 cachep->shared * cachep->batchcount,
-                                0xbaadf00d);
+                                0xbaadf00d, GFP_KERNEL);
                         if (!shared) {
                                 kfree(nc);
                                 goto bad;
                         }
                 }
                 if (use_alien_caches) {
-                        alien = alloc_alien_cache(node, cachep->limit);
+                        alien = alloc_alien_cache(node, cachep->limit, GFP_KERNEL);
                         if (!alien) {
                                 kfree(shared);
                                 kfree(nc);
@@ -1399,10 +1399,9 @@ static void init_list(struct kmem_cache *cachep, struct kmem_list3 *list,
 {
         struct kmem_list3 *ptr;
 
-        ptr = kmalloc_node(sizeof(struct kmem_list3), GFP_KERNEL, nodeid);
+        ptr = kmalloc_node(sizeof(struct kmem_list3), GFP_NOWAIT, nodeid);
         BUG_ON(!ptr);
 
-        local_irq_disable();
         memcpy(ptr, list, sizeof(struct kmem_list3));
         /*
          * Do not assume that spinlocks can be initialized via memcpy:
@@ -1411,7 +1410,6 @@ static void init_list(struct kmem_cache *cachep, struct kmem_list3 *list,
 
         MAKE_ALL_LISTS(cachep, ptr, nodeid);
         cachep->nodelists[nodeid] = ptr;
-        local_irq_enable();
 }
 
 /*
@@ -1575,9 +1573,8 @@ void __init kmem_cache_init(void)
         {
                 struct array_cache *ptr;
 
-                ptr = kmalloc(sizeof(struct arraycache_init), GFP_KERNEL);
+                ptr = kmalloc(sizeof(struct arraycache_init), GFP_NOWAIT);
 
-                local_irq_disable();
                 BUG_ON(cpu_cache_get(&cache_cache) != &initarray_cache.cache);
                 memcpy(ptr, cpu_cache_get(&cache_cache),
                        sizeof(struct arraycache_init));
@@ -1587,11 +1584,9 @@ void __init kmem_cache_init(void)
                 spin_lock_init(&ptr->lock);
 
                 cache_cache.array[smp_processor_id()] = ptr;
-                local_irq_enable();
 
-                ptr = kmalloc(sizeof(struct arraycache_init), GFP_KERNEL);
+                ptr = kmalloc(sizeof(struct arraycache_init), GFP_NOWAIT);
 
-                local_irq_disable();
                 BUG_ON(cpu_cache_get(malloc_sizes[INDEX_AC].cs_cachep)
                        != &initarray_generic.cache);
                 memcpy(ptr, cpu_cache_get(malloc_sizes[INDEX_AC].cs_cachep),
@@ -1603,7 +1598,6 @@ void __init kmem_cache_init(void)
 
                 malloc_sizes[INDEX_AC].cs_cachep->array[smp_processor_id()] =
                     ptr;
-                local_irq_enable();
         }
         /* 5) Replace the bootstrap kmem_list3's */
         {
@@ -1627,7 +1621,7 @@ void __init kmem_cache_init(void)
                 struct kmem_cache *cachep;
                 mutex_lock(&cache_chain_mutex);
                 list_for_each_entry(cachep, &cache_chain, next)
-                        if (enable_cpucache(cachep))
+                        if (enable_cpucache(cachep, GFP_NOWAIT))
                                 BUG();
                 mutex_unlock(&cache_chain_mutex);
         }
@@ -2064,10 +2058,10 @@ static size_t calculate_slab_order(struct kmem_cache *cachep,
         return left_over;
 }
 
-static int __init_refok setup_cpu_cache(struct kmem_cache *cachep)
+static int __init_refok setup_cpu_cache(struct kmem_cache *cachep, gfp_t gfp)
 {
         if (g_cpucache_up == FULL)
-                return enable_cpucache(cachep);
+                return enable_cpucache(cachep, gfp);
 
         if (g_cpucache_up == NONE) {
                 /*
@@ -2089,7 +2083,7 @@ static int __init_refok setup_cpu_cache(struct kmem_cache *cachep)
                         g_cpucache_up = PARTIAL_AC;
         } else {
                 cachep->array[smp_processor_id()] =
-                        kmalloc(sizeof(struct arraycache_init), GFP_KERNEL);
+                        kmalloc(sizeof(struct arraycache_init), gfp);
 
                 if (g_cpucache_up == PARTIAL_AC) {
                         set_up_list3s(cachep, SIZE_L3);
@@ -2153,6 +2147,7 @@ kmem_cache_create (const char *name, size_t size, size_t align,
 {
         size_t left_over, slab_size, ralign;
         struct kmem_cache *cachep = NULL, *pc;
+        gfp_t gfp;
 
         /*
          * Sanity checks... these are all serious usage bugs.
@@ -2168,8 +2163,10 @@ kmem_cache_create (const char *name, size_t size, size_t align,
          * We use cache_chain_mutex to ensure a consistent view of
          * cpu_online_mask as well.  Please see cpuup_callback
          */
-        get_online_cpus();
-        mutex_lock(&cache_chain_mutex);
+        if (slab_is_available()) {
+                get_online_cpus();
+                mutex_lock(&cache_chain_mutex);
+        }
 
         list_for_each_entry(pc, &cache_chain, next) {
                 char tmp;
@@ -2278,8 +2275,13 @@ kmem_cache_create (const char *name, size_t size, size_t align,
          */
         align = ralign;
 
+        if (slab_is_available())
+                gfp = GFP_KERNEL;
+        else
+                gfp = GFP_NOWAIT;
+
         /* Get cache's description obj. */
-        cachep = kmem_cache_zalloc(&cache_cache, GFP_KERNEL);
+        cachep = kmem_cache_zalloc(&cache_cache, gfp);
         if (!cachep)
                 goto oops;
 
@@ -2382,7 +2384,7 @@ kmem_cache_create (const char *name, size_t size, size_t align,
         cachep->ctor = ctor;
         cachep->name = name;
 
-        if (setup_cpu_cache(cachep)) {
+        if (setup_cpu_cache(cachep, gfp)) {
                 __kmem_cache_destroy(cachep);
                 cachep = NULL;
                 goto oops;
@@ -2394,8 +2396,10 @@ oops:
         if (!cachep && (flags & SLAB_PANIC))
                 panic("kmem_cache_create(): failed to create slab `%s'\n",
                       name);
-        mutex_unlock(&cache_chain_mutex);
-        put_online_cpus();
+        if (slab_is_available()) {
+                mutex_unlock(&cache_chain_mutex);
+                put_online_cpus();
+        }
         return cachep;
 }
 EXPORT_SYMBOL(kmem_cache_create);
@@ -3802,7 +3806,7 @@ EXPORT_SYMBOL_GPL(kmem_cache_name);
 /*
  * This initializes kmem_list3 or resizes various caches for all nodes.
  */
-static int alloc_kmemlist(struct kmem_cache *cachep)
+static int alloc_kmemlist(struct kmem_cache *cachep, gfp_t gfp)
 {
         int node;
         struct kmem_list3 *l3;
@@ -3812,7 +3816,7 @@ static int alloc_kmemlist(struct kmem_cache *cachep)
         for_each_online_node(node) {
 
                 if (use_alien_caches) {
-                        new_alien = alloc_alien_cache(node, cachep->limit);
+                        new_alien = alloc_alien_cache(node, cachep->limit, gfp);
                         if (!new_alien)
                                 goto fail;
                 }
@@ -3821,7 +3825,7 @@ static int alloc_kmemlist(struct kmem_cache *cachep)
                 if (cachep->shared) {
                         new_shared = alloc_arraycache(node,
                                 cachep->shared*cachep->batchcount,
-                                        0xbaadf00d);
+                                        0xbaadf00d, gfp);
                         if (!new_shared) {
                                 free_alien_cache(new_alien);
                                 goto fail;
@@ -3850,7 +3854,7 @@ static int alloc_kmemlist(struct kmem_cache *cachep)
                         free_alien_cache(new_alien);
                         continue;
                 }
-                l3 = kmalloc_node(sizeof(struct kmem_list3), GFP_KERNEL, node);
+                l3 = kmalloc_node(sizeof(struct kmem_list3), gfp, node);
                 if (!l3) {
                         free_alien_cache(new_alien);
                         kfree(new_shared);
@@ -3906,18 +3910,18 @@ static void do_ccupdate_local(void *info)
 
 /* Always called with the cache_chain_mutex held */
 static int do_tune_cpucache(struct kmem_cache *cachep, int limit,
-                                int batchcount, int shared)
+                                int batchcount, int shared, gfp_t gfp)
 {
         struct ccupdate_struct *new;
         int i;
 
-        new = kzalloc(sizeof(*new), GFP_KERNEL);
+        new = kzalloc(sizeof(*new), gfp);
         if (!new)
                 return -ENOMEM;
 
         for_each_online_cpu(i) {
                 new->new[i] = alloc_arraycache(cpu_to_node(i), limit,
-                                                batchcount);
+                                                batchcount, gfp);
                 if (!new->new[i]) {
                         for (i--; i >= 0; i--)
                                 kfree(new->new[i]);
@@ -3944,11 +3948,11 @@ static int do_tune_cpucache(struct kmem_cache *cachep, int limit,
                 kfree(ccold);
         }
         kfree(new);
-        return alloc_kmemlist(cachep);
+        return alloc_kmemlist(cachep, gfp);
 }
 
 /* Called with cache_chain_mutex held always */
-static int enable_cpucache(struct kmem_cache *cachep)
+static int enable_cpucache(struct kmem_cache *cachep, gfp_t gfp)
 {
         int err;
         int limit, shared;
@@ -3994,7 +3998,7 @@ static int enable_cpucache(struct kmem_cache *cachep)
         if (limit > 32)
                 limit = 32;
 #endif
-        err = do_tune_cpucache(cachep, limit, (limit + 1) / 2, shared);
+        err = do_tune_cpucache(cachep, limit, (limit + 1) / 2, shared, gfp);
         if (err)
                 printk(KERN_ERR "enable_cpucache failed for %s, error %d.\n",
                        cachep->name, -err);
@@ -4300,7 +4304,8 @@ ssize_t slabinfo_write(struct file *file, const char __user * buffer,
                                 res = 0;
                         } else {
                                 res = do_tune_cpucache(cachep, limit,
-                                                       batchcount, shared);
+                                                       batchcount, shared,
+                                                       GFP_KERNEL);
                         }
                         break;
                 }
diff --git a/mm/slub.c b/mm/slub.c
index 5e805a6fe36c..c1815a63807a 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -2557,13 +2557,16 @@ static struct kmem_cache *create_kmalloc_cache(struct kmem_cache *s,
         if (gfp_flags & SLUB_DMA)
                 flags = SLAB_CACHE_DMA;
 
-        down_write(&slub_lock);
+        /*
+         * This function is called with IRQs disabled during early-boot on
+         * single CPU so there's no need to take slub_lock here.
+         */
         if (!kmem_cache_open(s, gfp_flags, name, size, ARCH_KMALLOC_MINALIGN,
                                                                 flags, NULL))
                 goto panic;
 
         list_add(&s->list, &slab_caches);
-        up_write(&slub_lock);
+
         if (sysfs_slab_add(s))
                 goto panic;
         return s;
@@ -3021,7 +3024,7 @@ void __init kmem_cache_init(void)
          * kmem_cache_open for slab_state == DOWN.
          */
         create_kmalloc_cache(&kmalloc_caches[0], "kmem_cache_node",
-                sizeof(struct kmem_cache_node), GFP_KERNEL);
+                sizeof(struct kmem_cache_node), GFP_NOWAIT);
         kmalloc_caches[0].refcount = -1;
         caches++;
 
@@ -3034,16 +3037,16 @@ void __init kmem_cache_init(void)
         /* Caches that are not of the two-to-the-power-of size */
         if (KMALLOC_MIN_SIZE <= 64) {
                 create_kmalloc_cache(&kmalloc_caches[1],
-                                "kmalloc-96", 96, GFP_KERNEL);
+                                "kmalloc-96", 96, GFP_NOWAIT);
                 caches++;
                 create_kmalloc_cache(&kmalloc_caches[2],
-                                "kmalloc-192", 192, GFP_KERNEL);
+                                "kmalloc-192", 192, GFP_NOWAIT);
                 caches++;
         }
 
         for (i = KMALLOC_SHIFT_LOW; i < SLUB_PAGE_SHIFT; i++) {
                 create_kmalloc_cache(&kmalloc_caches[i],
-                        "kmalloc", 1 << i, GFP_KERNEL);
+                        "kmalloc", 1 << i, GFP_NOWAIT);
                 caches++;
         }
 
@@ -3080,7 +3083,7 @@ void __init kmem_cache_init(void)
         /* Provide the correct kmalloc names now that the caches are up */
         for (i = KMALLOC_SHIFT_LOW; i < SLUB_PAGE_SHIFT; i++)
                 kmalloc_caches[i]. name =
-                        kasprintf(GFP_KERNEL, "kmalloc-%d", 1 << i);
+                        kasprintf(GFP_NOWAIT, "kmalloc-%d", 1 << i);
 
 #ifdef CONFIG_SMP
         register_cpu_notifier(&slab_notifier);