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[PATCH] slab: convert cache to page mapping macros

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This patch converts object cache <-> page mapping macros to static inline
functions to make the more explicit and readable.

Signed-off-by: Pekka Enberg <penberg@cs.helsinki.fi>
Cc: Manfred Spraul <manfred@colorfullife.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Pekka Enberg 2005-11-13 16:06:46 -08:00 committed by Linus Torvalds
parent 669ed17521
commit 065d41cb26
1 changed files with 32 additions and 17 deletions
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49
mm/slab.c
View file

@ -565,14 +565,29 @@ static void **dbg_userword(kmem_cache_t *cachep, void *objp)
#define BREAK_GFP_ORDER_LO 0
static int slab_break_gfp_order = BREAK_GFP_ORDER_LO;
/* Macros for storing/retrieving the cachep and or slab from the
/* Functions for storing/retrieving the cachep and or slab from the
* global 'mem_map'. These are used to find the slab an obj belongs to.
* With kfree(), these are used to find the cache which an obj belongs to.
*/
#define SET_PAGE_CACHE(pg,x) ((pg)->lru.next = (struct list_head *)(x))
#define GET_PAGE_CACHE(pg) ((kmem_cache_t *)(pg)->lru.next)
#define SET_PAGE_SLAB(pg,x) ((pg)->lru.prev = (struct list_head *)(x))
#define GET_PAGE_SLAB(pg) ((struct slab *)(pg)->lru.prev)
static inline void page_set_cache(struct page *page, struct kmem_cache *cache)
{
page->lru.next = (struct list_head *)cache;
}
static inline struct kmem_cache *page_get_cache(struct page *page)
{
return (struct kmem_cache *)page->lru.next;
}
static inline void page_set_slab(struct page *page, struct slab *slab)
{
page->lru.prev = (struct list_head *)slab;
}
static inline struct slab *page_get_slab(struct page *page)
{
return (struct slab *)page->lru.prev;
}
/* These are the default caches for kmalloc. Custom caches can have other sizes. */
struct cache_sizes malloc_sizes[] = {
@ -1368,7 +1383,7 @@ static void check_poison_obj(kmem_cache_t *cachep, void *objp)
/* Print some data about the neighboring objects, if they
* exist:
*/
struct slab *slabp = GET_PAGE_SLAB(virt_to_page(objp));
struct slab *slabp = page_get_slab(virt_to_page(objp));
int objnr;
objnr = (objp-slabp->s_mem)/cachep->objsize;
@ -2138,8 +2153,8 @@ static void set_slab_attr(kmem_cache_t *cachep, struct slab *slabp, void *objp)
i = 1 << cachep->gfporder;
page = virt_to_page(objp);
do {
SET_PAGE_CACHE(page, cachep);
SET_PAGE_SLAB(page, slabp);
page_set_cache(page, cachep);
page_set_slab(page, slabp);
page++;
} while (--i);
}
@ -2269,14 +2284,14 @@ static void *cache_free_debugcheck(kmem_cache_t *cachep, void *objp,
kfree_debugcheck(objp);
page = virt_to_page(objp);
if (GET_PAGE_CACHE(page) != cachep) {
if (page_get_cache(page) != cachep) {
printk(KERN_ERR "mismatch in kmem_cache_free: expected cache %p, got %p\n",
GET_PAGE_CACHE(page),cachep);
page_get_cache(page),cachep);
printk(KERN_ERR "%p is %s.\n", cachep, cachep->name);
printk(KERN_ERR "%p is %s.\n", GET_PAGE_CACHE(page), GET_PAGE_CACHE(page)->name);
printk(KERN_ERR "%p is %s.\n", page_get_cache(page), page_get_cache(page)->name);
WARN_ON(1);
}
slabp = GET_PAGE_SLAB(page);
slabp = page_get_slab(page);
if (cachep->flags & SLAB_RED_ZONE) {
if (*dbg_redzone1(cachep, objp) != RED_ACTIVE || *dbg_redzone2(cachep, objp) != RED_ACTIVE) {
@ -2628,7 +2643,7 @@ static void free_block(kmem_cache_t *cachep, void **objpp, int nr_objects, int n
struct slab *slabp;
unsigned int objnr;
slabp = GET_PAGE_SLAB(virt_to_page(objp));
slabp = page_get_slab(virt_to_page(objp));
l3 = cachep->nodelists[node];
list_del(&slabp->list);
objnr = (objp - slabp->s_mem) / cachep->objsize;
@ -2744,7 +2759,7 @@ static inline void __cache_free(kmem_cache_t *cachep, void *objp)
#ifdef CONFIG_NUMA
{
struct slab *slabp;
slabp = GET_PAGE_SLAB(virt_to_page(objp));
slabp = page_get_slab(virt_to_page(objp));
if (unlikely(slabp->nodeid != numa_node_id())) {
struct array_cache *alien = NULL;
int nodeid = slabp->nodeid;
@ -2830,7 +2845,7 @@ int fastcall kmem_ptr_validate(kmem_cache_t *cachep, void *ptr)
page = virt_to_page(ptr);
if (unlikely(!PageSlab(page)))
goto out;
if (unlikely(GET_PAGE_CACHE(page) != cachep))
if (unlikely(page_get_cache(page) != cachep))
goto out;
return 1;
out:
@ -3026,7 +3041,7 @@ void kfree(const void *objp)
return;
local_irq_save(flags);
kfree_debugcheck(objp);
c = GET_PAGE_CACHE(virt_to_page(objp));
c = page_get_cache(virt_to_page(objp));
__cache_free(c, (void*)objp);
local_irq_restore(flags);
}
@ -3596,7 +3611,7 @@ unsigned int ksize(const void *objp)
if (unlikely(objp == NULL))
return 0;
return obj_reallen(GET_PAGE_CACHE(virt_to_page(objp)));
return obj_reallen(page_get_cache(virt_to_page(objp)));
}