1 files changed, 30 insertions, 11 deletions

diff --git a/mm/slab.c b/mm/slab.c
index 6a1ad0b9a94f..af3376d0a833 100644
--- a/mm/slab.c
+++ b/mm/slab.c
@@ -305,6 +305,12 @@ struct kmem_list3 {
 };
 
 /*
+ * The slab allocator is initialized with interrupts disabled. Therefore, make
+ * sure early boot allocations don't accidentally enable interrupts.
+ */
+static gfp_t slab_gfp_mask __read_mostly = SLAB_GFP_BOOT_MASK;
+
+/*
  * Need this for bootstrapping a per node allocator.
  */
 #define NUM_INIT_LISTS (3 * MAX_NUMNODES)
@@ -673,6 +679,7 @@ static enum {
         NONE,
         PARTIAL_AC,
         PARTIAL_L3,
+        EARLY,
         FULL
 } g_cpucache_up;
 
@@ -681,7 +688,7 @@ static enum {
  */
 int slab_is_available(void)
 {
-        return g_cpucache_up == FULL;
+        return g_cpucache_up >= EARLY;
 }
 
 static DEFINE_PER_CPU(struct delayed_work, reap_work);
@@ -1545,19 +1552,27 @@ void __init kmem_cache_init(void)
                 }
         }
 
-        /* 6) resize the head arrays to their final sizes */
-        {
-                struct kmem_cache *cachep;
-                mutex_lock(&cache_chain_mutex);
-                list_for_each_entry(cachep, &cache_chain, next)
-                        if (enable_cpucache(cachep, GFP_NOWAIT))
-                                BUG();
-                mutex_unlock(&cache_chain_mutex);
-        }
+        g_cpucache_up = EARLY;
 
         /* Annotate slab for lockdep -- annotate the malloc caches */
         init_lock_keys();
+}
+
+void __init kmem_cache_init_late(void)
+{
+        struct kmem_cache *cachep;
+
+        /*
+         * Interrupts are enabled now so all GFP allocations are safe.
+         */
+        slab_gfp_mask = __GFP_BITS_MASK;
 
+        /* 6) resize the head arrays to their final sizes */
+        mutex_lock(&cache_chain_mutex);
+        list_for_each_entry(cachep, &cache_chain, next)
+                if (enable_cpucache(cachep, GFP_NOWAIT))
+                        BUG();
+        mutex_unlock(&cache_chain_mutex);
 
         /* Done! */
         g_cpucache_up = FULL;
@@ -2034,7 +2049,7 @@ static int __init_refok setup_cpu_cache(struct kmem_cache *cachep, gfp_t gfp)
                         for_each_online_node(node) {
                                 cachep->nodelists[node] =
                                     kmalloc_node(sizeof(struct kmem_list3),
-                                                GFP_KERNEL, node);
+                                                gfp, node);
                                 BUG_ON(!cachep->nodelists[node]);
                                 kmem_list3_init(cachep->nodelists[node]);
                         }
@@ -3286,6 +3301,8 @@ __cache_alloc_node(struct kmem_cache *cachep, gfp_t flags, int nodeid,
         unsigned long save_flags;
         void *ptr;
 
+        flags &= slab_gfp_mask;
+
         lockdep_trace_alloc(flags);
 
         if (slab_should_failslab(cachep, flags))
@@ -3369,6 +3386,8 @@ __cache_alloc(struct kmem_cache *cachep, gfp_t flags, void *caller)
         unsigned long save_flags;
         void *objp;
 
+        flags &= slab_gfp_mask;
+
         lockdep_trace_alloc(flags);
 
         if (slab_should_failslab(cachep, flags))