[PATCH] add slab_is_available() routine for boot code
slab_is_available() indicates slab based allocators are available for use.
SPARSEMEM code needs to know this as it can be called at various times
during the boot process.
Signed-off-by: Mike Kravetz <kravetz@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
diff --git a/include/linux/slab.h b/include/linux/slab.h
index 3af03b1..2d985d5 100644
--- a/include/linux/slab.h
+++ b/include/linux/slab.h
@@ -150,6 +150,7 @@
extern void kfree(const void *);
extern unsigned int ksize(const void *);
+extern int slab_is_available(void);
#ifdef CONFIG_NUMA
extern void *kmem_cache_alloc_node(kmem_cache_t *, gfp_t flags, int node);
diff --git a/mm/slab.c b/mm/slab.c
index c32af7e..b1d643b 100644
--- a/mm/slab.c
+++ b/mm/slab.c
@@ -700,6 +700,14 @@
FULL
} g_cpucache_up;
+/*
+ * used by boot code to determine if it can use slab based allocator
+ */
+int slab_is_available(void)
+{
+ return g_cpucache_up == FULL;
+}
+
static DEFINE_PER_CPU(struct work_struct, reap_work);
static void free_block(struct kmem_cache *cachep, void **objpp, int len,
diff --git a/mm/sparse.c b/mm/sparse.c
index d7c32de..c5e89eb 100644
--- a/mm/sparse.c
+++ b/mm/sparse.c
@@ -32,7 +32,7 @@
unsigned long array_size = SECTIONS_PER_ROOT *
sizeof(struct mem_section);
- if (system_state == SYSTEM_RUNNING)
+ if (slab_is_available())
section = kmalloc_node(array_size, GFP_KERNEL, nid);
else
section = alloc_bootmem_node(NODE_DATA(nid), array_size);