diff options
Diffstat (limited to 'mm/slub.c')
| -rw-r--r-- | mm/slub.c | 50 |
1 files changed, 33 insertions, 17 deletions
diff --git a/mm/slub.c b/mm/slub.c index cc4001fee7a..121acd17de9 100644 --- a/mm/slub.c +++ b/mm/slub.c @@ -25,6 +25,7 @@ #include <linux/kallsyms.h> #include <linux/memory.h> #include <linux/math64.h> +#include <linux/fault-inject.h> /* * Lock order: @@ -154,6 +155,10 @@ #define ARCH_SLAB_MINALIGN __alignof__(unsigned long long) #endif +#define OO_SHIFT 16 +#define OO_MASK ((1 << OO_SHIFT) - 1) +#define MAX_OBJS_PER_PAGE 65535 /* since page.objects is u16 */ + /* Internal SLUB flags */ #define __OBJECT_POISON 0x80000000 /* Poison object */ #define __SYSFS_ADD_DEFERRED 0x40000000 /* Not yet visible via sysfs */ @@ -291,7 +296,7 @@ static inline struct kmem_cache_order_objects oo_make(int order, unsigned long size) { struct kmem_cache_order_objects x = { - (order << 16) + (PAGE_SIZE << order) / size + (order << OO_SHIFT) + (PAGE_SIZE << order) / size }; return x; @@ -299,12 +304,12 @@ static inline struct kmem_cache_order_objects oo_make(int order, static inline int oo_order(struct kmem_cache_order_objects x) { - return x.x >> 16; + return x.x >> OO_SHIFT; } static inline int oo_objects(struct kmem_cache_order_objects x) { - return x.x & ((1 << 16) - 1); + return x.x & OO_MASK; } #ifdef CONFIG_SLUB_DEBUG @@ -693,7 +698,7 @@ static int check_object(struct kmem_cache *s, struct page *page, if (!check_valid_pointer(s, page, get_freepointer(s, p))) { object_err(s, page, p, "Freepointer corrupt"); /* - * No choice but to zap it and thus loose the remainder + * No choice but to zap it and thus lose the remainder * of the free objects in this slab. May cause * another error because the object count is now wrong. */ @@ -765,8 +770,8 @@ static int on_freelist(struct kmem_cache *s, struct page *page, void *search) } max_objects = (PAGE_SIZE << compound_order(page)) / s->size; - if (max_objects > 65535) - max_objects = 65535; + if (max_objects > MAX_OBJS_PER_PAGE) + max_objects = MAX_OBJS_PER_PAGE; if (page->objects != max_objects) { slab_err(s, page, "Wrong number of objects. Found %d but " @@ -1592,6 +1597,11 @@ static __always_inline void *slab_alloc(struct kmem_cache *s, unsigned long flags; unsigned int objsize; + might_sleep_if(gfpflags & __GFP_WAIT); + + if (should_failslab(s->objsize, gfpflags)) + return NULL; + local_irq_save(flags); c = get_cpu_slab(s, smp_processor_id()); objsize = c->objsize; @@ -1766,7 +1776,7 @@ void kmem_cache_free(struct kmem_cache *s, void *x) } EXPORT_SYMBOL(kmem_cache_free); -/* Figure out on which slab object the object resides */ +/* Figure out on which slab page the object resides */ static struct page *get_object_page(const void *x) { struct page *page = virt_to_head_page(x); @@ -1838,8 +1848,8 @@ static inline int slab_order(int size, int min_objects, int rem; int min_order = slub_min_order; - if ((PAGE_SIZE << min_order) / size > 65535) - return get_order(size * 65535) - 1; + if ((PAGE_SIZE << min_order) / size > MAX_OBJS_PER_PAGE) + return get_order(size * MAX_OBJS_PER_PAGE) - 1; for (order = max(min_order, fls(min_objects * size - 1) - PAGE_SHIFT); @@ -2104,8 +2114,7 @@ static inline int alloc_kmem_cache_cpus(struct kmem_cache *s, gfp_t flags) * when allocating for the kmalloc_node_cache. This is used for bootstrapping * memory on a fresh node that has no slab structures yet. */ -static struct kmem_cache_node *early_kmem_cache_node_alloc(gfp_t gfpflags, - int node) +static void early_kmem_cache_node_alloc(gfp_t gfpflags, int node) { struct page *page; struct kmem_cache_node *n; @@ -2143,7 +2152,6 @@ static struct kmem_cache_node *early_kmem_cache_node_alloc(gfp_t gfpflags, local_irq_save(flags); add_partial(n, page, 0); local_irq_restore(flags); - return n; } static void free_kmem_cache_nodes(struct kmem_cache *s) @@ -2175,8 +2183,7 @@ static int init_kmem_cache_nodes(struct kmem_cache *s, gfp_t gfpflags) n = &s->local_node; else { if (slab_state == DOWN) { - n = early_kmem_cache_node_alloc(gfpflags, - node); + early_kmem_cache_node_alloc(gfpflags, node); continue; } n = kmem_cache_alloc_node(kmalloc_caches, @@ -3176,8 +3183,12 @@ struct kmem_cache *kmem_cache_create(const char *name, size_t size, s->inuse = max_t(int, s->inuse, ALIGN(size, sizeof(void *))); up_write(&slub_lock); - if (sysfs_slab_alias(s, name)) + if (sysfs_slab_alias(s, name)) { + down_write(&slub_lock); + s->refcount--; + up_write(&slub_lock); goto err; + } return s; } @@ -3187,8 +3198,13 @@ struct kmem_cache *kmem_cache_create(const char *name, size_t size, size, align, flags, ctor)) { list_add(&s->list, &slab_caches); up_write(&slub_lock); - if (sysfs_slab_add(s)) + if (sysfs_slab_add(s)) { + down_write(&slub_lock); + list_del(&s->list); + up_write(&slub_lock); + kfree(s); goto err; + } return s; } kfree(s); @@ -4412,7 +4428,7 @@ static void sysfs_slab_remove(struct kmem_cache *s) /* * Need to buffer aliases during bootup until sysfs becomes - * available lest we loose that information. + * available lest we lose that information. */ struct saved_alias { struct kmem_cache *s; |