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slub: get_map() function to establish map of free objects in a slab
The bit map of free objects in a slab page is determined in various functions if debugging is enabled. Provide a common function for that purpose. Signed-off-by: Christoph Lameter <cl@linux.com> Signed-off-by: Pekka Enberg <penberg@kernel.org>
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34
mm/slub.c
34
mm/slub.c
@ -271,10 +271,6 @@ static inline void set_freepointer(struct kmem_cache *s, void *object, void *fp)
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for (__p = (__addr); __p < (__addr) + (__objects) * (__s)->size;\
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__p += (__s)->size)
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/* Scan freelist */
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#define for_each_free_object(__p, __s, __free) \
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for (__p = (__free); __p; __p = get_freepointer((__s), __p))
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/* Determine object index from a given position */
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static inline int slab_index(void *p, struct kmem_cache *s, void *addr)
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{
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@ -330,6 +326,21 @@ static inline int oo_objects(struct kmem_cache_order_objects x)
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return x.x & OO_MASK;
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}
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/*
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* Determine a map of object in use on a page.
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*
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* Slab lock or node listlock must be held to guarantee that the page does
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* not vanish from under us.
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*/
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static void get_map(struct kmem_cache *s, struct page *page, unsigned long *map)
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{
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void *p;
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void *addr = page_address(page);
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for (p = page->freelist; p; p = get_freepointer(s, p))
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set_bit(slab_index(p, s, addr), map);
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}
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#ifdef CONFIG_SLUB_DEBUG
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/*
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* Debug settings:
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@ -2673,9 +2684,8 @@ static void list_slab_objects(struct kmem_cache *s, struct page *page,
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return;
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slab_err(s, page, "%s", text);
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slab_lock(page);
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for_each_free_object(p, s, page->freelist)
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set_bit(slab_index(p, s, addr), map);
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get_map(s, page, map);
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for_each_object(p, s, addr, page->objects) {
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if (!test_bit(slab_index(p, s, addr), map)) {
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@ -3610,10 +3620,11 @@ static int validate_slab(struct kmem_cache *s, struct page *page,
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/* Now we know that a valid freelist exists */
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bitmap_zero(map, page->objects);
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for_each_free_object(p, s, page->freelist) {
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set_bit(slab_index(p, s, addr), map);
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if (!check_object(s, page, p, SLUB_RED_INACTIVE))
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return 0;
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get_map(s, page, map);
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for_each_object(p, s, addr, page->objects) {
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if (test_bit(slab_index(p, s, addr), map))
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if (!check_object(s, page, p, SLUB_RED_INACTIVE))
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return 0;
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}
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for_each_object(p, s, addr, page->objects)
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@ -3821,8 +3832,7 @@ static void process_slab(struct loc_track *t, struct kmem_cache *s,
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void *p;
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bitmap_zero(map, page->objects);
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for_each_free_object(p, s, page->freelist)
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set_bit(slab_index(p, s, addr), map);
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get_map(s, page, map);
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for_each_object(p, s, addr, page->objects)
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if (!test_bit(slab_index(p, s, addr), map))
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