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slab: introduce helper functions to get/set free object

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In the following patches, to get/set free objects from the freelist
is changed so that simple casting doesn't work for it. Therefore,
introduce helper functions.

Acked-by: Christoph Lameter <cl@linux.com>
Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Signed-off-by: Pekka Enberg <penberg@kernel.org>
This commit is contained in:
Joonsoo Kim 2013-12-02 17:49:40 +09:00 committed by Pekka Enberg
parent 9cef2e2b65
commit e5c58dfdcb
1 changed files with 13 additions and 7 deletions
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20
mm/slab.c
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@ -2548,9 +2548,15 @@ static void *alloc_slabmgmt(struct kmem_cache *cachep,
return freelist;
}
static inline unsigned int *slab_freelist(struct page *page)
static inline unsigned int get_free_obj(struct page *page, unsigned int idx)
{
return (unsigned int *)(page->freelist);
return ((unsigned int *)page->freelist)[idx];
}
static inline void set_free_obj(struct page *page,
unsigned int idx, unsigned int val)
{
((unsigned int *)(page->freelist))[idx] = val;
}
static void cache_init_objs(struct kmem_cache *cachep,
@ -2595,7 +2601,7 @@ static void cache_init_objs(struct kmem_cache *cachep,
if (cachep->ctor)
cachep->ctor(objp);
#endif
slab_freelist(page)[i] = i;
set_free_obj(page, i, i);
}
}
@ -2614,7 +2620,7 @@ static void *slab_get_obj(struct kmem_cache *cachep, struct page *page,
{
void *objp;
objp = index_to_obj(cachep, page, slab_freelist(page)[page->active]);
objp = index_to_obj(cachep, page, get_free_obj(page, page->active));
page->active++;
#if DEBUG
WARN_ON(page_to_nid(virt_to_page(objp)) != nodeid);
@ -2635,7 +2641,7 @@ static void slab_put_obj(struct kmem_cache *cachep, struct page *page,
/* Verify double free bug */
for (i = page->active; i < cachep->num; i++) {
if (slab_freelist(page)[i] == objnr) {
if (get_free_obj(page, i) == objnr) {
printk(KERN_ERR "slab: double free detected in cache "
"'%s', objp %p\n", cachep->name, objp);
BUG();
@ -2643,7 +2649,7 @@ static void slab_put_obj(struct kmem_cache *cachep, struct page *page,
}
#endif
page->active--;
slab_freelist(page)[page->active] = objnr;
set_free_obj(page, page->active, objnr);
}
/*
@ -4216,7 +4222,7 @@ static void handle_slab(unsigned long *n, struct kmem_cache *c,
for (j = page->active; j < c->num; j++) {
/* Skip freed item */
if (slab_freelist(page)[j] == i) {
if (get_free_obj(page, j) == i) {
active = false;
break;
}