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[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>
hifive-unleashed-5.1
Mike Kravetz 2006-05-15 09:44:13 -07:00 committed by Linus Torvalds
parent 48564e628b
commit 39d24e6426
3 changed files with 10 additions and 1 deletions
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1
include/linux/slab.h
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@ -150,6 +150,7 @@ static inline void *kcalloc(size_t n, size_t size, gfp_t flags)
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);

8
mm/slab.c
View File

@ -700,6 +700,14 @@ static enum {
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,

2
mm/sparse.c
View File

@ -32,7 +32,7 @@ static struct mem_section *sparse_index_alloc(int nid)
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);