diff options
Diffstat (limited to 'mm/slub.c')
| -rw-r--r-- | mm/slub.c | 56 |
1 files changed, 34 insertions, 22 deletions
diff --git a/mm/slub.c b/mm/slub.c index 2b1a6970e46f..7e3e0458bce4 100644 --- a/mm/slub.c +++ b/mm/slub.c @@ -1000,23 +1000,22 @@ static inline void slab_free_hook(struct kmem_cache *s, void *x) /* * Tracking of fully allocated slabs for debugging purposes. - * - * list_lock must be held. */ static void add_full(struct kmem_cache *s, struct kmem_cache_node *n, struct page *page) { + lockdep_assert_held(&n->list_lock); + if (!(s->flags & SLAB_STORE_USER)) return; list_add(&page->lru, &n->full); } -/* - * list_lock must be held. - */ -static void remove_full(struct kmem_cache *s, struct page *page) +static void remove_full(struct kmem_cache *s, struct kmem_cache_node *n, struct page *page) { + lockdep_assert_held(&n->list_lock); + if (!(s->flags & SLAB_STORE_USER)) return; @@ -1265,7 +1264,8 @@ static inline int check_object(struct kmem_cache *s, struct page *page, void *object, u8 val) { return 1; } static inline void add_full(struct kmem_cache *s, struct kmem_cache_node *n, struct page *page) {} -static inline void remove_full(struct kmem_cache *s, struct page *page) {} +static inline void remove_full(struct kmem_cache *s, struct kmem_cache_node *n, + struct page *page) {} static inline unsigned long kmem_cache_flags(unsigned long object_size, unsigned long flags, const char *name, void (*ctor)(void *)) @@ -1519,12 +1519,12 @@ static void discard_slab(struct kmem_cache *s, struct page *page) /* * Management of partially allocated slabs. - * - * list_lock must be held. */ static inline void add_partial(struct kmem_cache_node *n, struct page *page, int tail) { + lockdep_assert_held(&n->list_lock); + n->nr_partial++; if (tail == DEACTIVATE_TO_TAIL) list_add_tail(&page->lru, &n->partial); @@ -1532,12 +1532,11 @@ static inline void add_partial(struct kmem_cache_node *n, list_add(&page->lru, &n->partial); } -/* - * list_lock must be held. - */ static inline void remove_partial(struct kmem_cache_node *n, struct page *page) { + lockdep_assert_held(&n->list_lock); + list_del(&page->lru); n->nr_partial--; } @@ -1547,8 +1546,6 @@ static inline void remove_partial(struct kmem_cache_node *n, * return the pointer to the freelist. * * Returns a list of objects or NULL if it fails. - * - * Must hold list_lock since we modify the partial list. */ static inline void *acquire_slab(struct kmem_cache *s, struct kmem_cache_node *n, struct page *page, @@ -1558,6 +1555,8 @@ static inline void *acquire_slab(struct kmem_cache *s, unsigned long counters; struct page new; + lockdep_assert_held(&n->list_lock); + /* * Zap the freelist and set the frozen bit. * The old freelist is the list of objects for the @@ -1902,7 +1901,7 @@ redo: else if (l == M_FULL) - remove_full(s, page); + remove_full(s, n, page); if (m == M_PARTIAL) { @@ -2556,7 +2555,7 @@ static void __slab_free(struct kmem_cache *s, struct page *page, new.inuse--; if ((!new.inuse || !prior) && !was_frozen) { - if (kmem_cache_has_cpu_partial(s) && !prior) + if (kmem_cache_has_cpu_partial(s) && !prior) { /* * Slab was on no list before and will be @@ -2566,7 +2565,7 @@ static void __slab_free(struct kmem_cache *s, struct page *page, */ new.frozen = 1; - else { /* Needs to be taken off a list */ + } else { /* Needs to be taken off a list */ n = get_node(s, page_to_nid(page)); /* @@ -2615,7 +2614,7 @@ static void __slab_free(struct kmem_cache *s, struct page *page, */ if (!kmem_cache_has_cpu_partial(s) && unlikely(!prior)) { if (kmem_cache_debug(s)) - remove_full(s, page); + remove_full(s, n, page); add_partial(n, page, DEACTIVATE_TO_TAIL); stat(s, FREE_ADD_PARTIAL); } @@ -2629,9 +2628,10 @@ slab_empty: */ remove_partial(n, page); stat(s, FREE_REMOVE_PARTIAL); - } else + } else { /* Slab must be on the full list */ - remove_full(s, page); + remove_full(s, n, page); + } spin_unlock_irqrestore(&n->list_lock, flags); stat(s, FREE_SLAB); @@ -2905,7 +2905,13 @@ static void early_kmem_cache_node_alloc(int node) init_kmem_cache_node(n); inc_slabs_node(kmem_cache_node, node, page->objects); + /* + * the lock is for lockdep's sake, not for any actual + * race protection + */ + spin_lock(&n->list_lock); add_partial(n, page, DEACTIVATE_TO_HEAD); + spin_unlock(&n->list_lock); } static void free_kmem_cache_nodes(struct kmem_cache *s) @@ -4314,7 +4320,13 @@ static ssize_t show_slab_objects(struct kmem_cache *s, page = ACCESS_ONCE(c->partial); if (page) { - x = page->pobjects; + node = page_to_nid(page); + if (flags & SO_TOTAL) + WARN_ON_ONCE(1); + else if (flags & SO_OBJECTS) + WARN_ON_ONCE(1); + else + x = page->pages; total += x; nodes[node] += x; } @@ -5178,7 +5190,7 @@ static int sysfs_slab_add(struct kmem_cache *s) } s->kobj.kset = slab_kset; - err = kobject_init_and_add(&s->kobj, &slab_ktype, NULL, name); + err = kobject_init_and_add(&s->kobj, &slab_ktype, NULL, "%s", name); if (err) { kobject_put(&s->kobj); return err; |