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authorJoonsoo Kim <iamjoonsoo.kim@lge.com>2013-12-02 17:49:40 +0900
committerPekka Enberg <penberg@kernel.org>2014-02-08 12:10:35 +0200
commite5c58dfdcbd36f6b4c4c92c31cf6753d22da630a (patch)
tree77d6714ad9b14aefdef667c6efe72c58a5a6c6c7
parent9cef2e2b6589406562bf12a9a633d7d7630340a1 (diff)
slab: introduce helper functions to get/set free object
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>
-rw-r--r--mm/slab.c20
1 files changed, 13 insertions, 7 deletions
diff --git a/mm/slab.c b/mm/slab.c
index f81176dd0a90..878354b26b72 100644
--- a/mm/slab.c
+++ b/mm/slab.c
@@ -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;
}