slab: setup cpu caches later on when interrupts are enabled

Fixes the following boot-time warning:

  [    0.000000] ------------[ cut here ]------------
  [    0.000000] WARNING: at kernel/smp.c:369 smp_call_function_many+0x56/0x1bc()
  [    0.000000] Hardware name:
  [    0.000000] Modules linked in:
  [    0.000000] Pid: 0, comm: swapper Not tainted 2.6.30 #492
  [    0.000000] Call Trace:
  [    0.000000]  [<ffffffff8149e021>] ? _spin_unlock+0x4f/0x5c
  [    0.000000]  [<ffffffff8108f11b>] ? smp_call_function_many+0x56/0x1bc
  [    0.000000]  [<ffffffff81061764>] warn_slowpath_common+0x7c/0xa9
  [    0.000000]  [<ffffffff810617a5>] warn_slowpath_null+0x14/0x16
  [    0.000000]  [<ffffffff8108f11b>] smp_call_function_many+0x56/0x1bc
  [    0.000000]  [<ffffffff810f3e00>] ? do_ccupdate_local+0x0/0x54
  [    0.000000]  [<ffffffff810f3e00>] ? do_ccupdate_local+0x0/0x54
  [    0.000000]  [<ffffffff8108f2be>] smp_call_function+0x3d/0x68
  [    0.000000]  [<ffffffff810f3e00>] ? do_ccupdate_local+0x0/0x54
  [    0.000000]  [<ffffffff81066fd8>] on_each_cpu+0x31/0x7c
  [    0.000000]  [<ffffffff810f64f5>] do_tune_cpucache+0x119/0x454
  [    0.000000]  [<ffffffff81087080>] ? lockdep_init_map+0x94/0x10b
  [    0.000000]  [<ffffffff818133b0>] ? kmem_cache_init+0x421/0x593
  [    0.000000]  [<ffffffff810f69cf>] enable_cpucache+0x68/0xad
  [    0.000000]  [<ffffffff818133c3>] kmem_cache_init+0x434/0x593
  [    0.000000]  [<ffffffff8180987c>] ? mem_init+0x156/0x161
  [    0.000000]  [<ffffffff817f8aae>] start_kernel+0x1cc/0x3b9
  [    0.000000]  [<ffffffff817f829a>] x86_64_start_reservations+0xaa/0xae
  [    0.000000]  [<ffffffff817f837f>] x86_64_start_kernel+0xe1/0xe8
  [    0.000000] ---[ end trace 4eaa2a86a8e2da22 ]---

Cc: Christoph Lameter <cl@linux-foundation.org>
Cc: Nick Piggin <npiggin@suse.de>
Signed-off-by: Pekka Enberg <penberg@cs.helsinki.fi>

diff --git a/mm/slab.c b/mm/slab.c
index 453efcb..18e3164 100644 (file)
--- a/mm/slab.c
+++ b/mm/slab.c
@@ -759,6 +759,7 @@ static enum {
        NONE,
        PARTIAL_AC,
        PARTIAL_L3,
+       EARLY,
        FULL
 } g_cpucache_up;
 
@@ -767,7 +768,7 @@ 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);
@@ -1631,19 +1632,27 @@ 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;
@@ -1660,14 +1669,6 @@ void __init kmem_cache_init(void)
         */
 }
 
-void __init kmem_cache_init_late(void)
-{
-       /*
-        * Interrupts are enabled now so all GFP allocations are safe.
-        */
-       slab_gfp_mask = __GFP_BITS_MASK;
-}
-
 static int __init cpucache_init(void)
 {
        int cpu;