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-rw-r--r--mm/Makefile1
-rw-r--r--mm/bounce.c9
-rw-r--r--mm/failslab.c59
-rw-r--r--mm/memory.c15
-rw-r--r--mm/slab.c81
-rw-r--r--mm/slub.c50
6 files changed, 124 insertions, 91 deletions
diff --git a/mm/Makefile b/mm/Makefile
index 3782eb66d4b..c92e8af1320 100644
--- a/mm/Makefile
+++ b/mm/Makefile
@@ -28,6 +28,7 @@ obj-$(CONFIG_SLOB) += slob.o
obj-$(CONFIG_MMU_NOTIFIER) += mmu_notifier.o
obj-$(CONFIG_SLAB) += slab.o
obj-$(CONFIG_SLUB) += slub.o
+obj-$(CONFIG_FAILSLAB) += failslab.o
obj-$(CONFIG_MEMORY_HOTPLUG) += memory_hotplug.o
obj-$(CONFIG_FS_XIP) += filemap_xip.o
obj-$(CONFIG_MIGRATION) += migrate.o
diff --git a/mm/bounce.c b/mm/bounce.c
index bf0cf7c8387..e590272fe7a 100644
--- a/mm/bounce.c
+++ b/mm/bounce.c
@@ -198,8 +198,13 @@ static void __blk_queue_bounce(struct request_queue *q, struct bio **bio_orig,
/*
* irk, bounce it
*/
- if (!bio)
- bio = bio_alloc(GFP_NOIO, (*bio_orig)->bi_vcnt);
+ if (!bio) {
+ unsigned int cnt = (*bio_orig)->bi_vcnt;
+
+ bio = bio_alloc(GFP_NOIO, cnt);
+ memset(bio->bi_io_vec, 0, cnt * sizeof(struct bio_vec));
+ }
+
to = bio->bi_io_vec + i;
diff --git a/mm/failslab.c b/mm/failslab.c
new file mode 100644
index 00000000000..7c6ea6493f8
--- /dev/null
+++ b/mm/failslab.c
@@ -0,0 +1,59 @@
+#include <linux/fault-inject.h>
+
+static struct {
+ struct fault_attr attr;
+ u32 ignore_gfp_wait;
+#ifdef CONFIG_FAULT_INJECTION_DEBUG_FS
+ struct dentry *ignore_gfp_wait_file;
+#endif
+} failslab = {
+ .attr = FAULT_ATTR_INITIALIZER,
+ .ignore_gfp_wait = 1,
+};
+
+bool should_failslab(size_t size, gfp_t gfpflags)
+{
+ if (gfpflags & __GFP_NOFAIL)
+ return false;
+
+ if (failslab.ignore_gfp_wait && (gfpflags & __GFP_WAIT))
+ return false;
+
+ return should_fail(&failslab.attr, size);
+}
+
+static int __init setup_failslab(char *str)
+{
+ return setup_fault_attr(&failslab.attr, str);
+}
+__setup("failslab=", setup_failslab);
+
+#ifdef CONFIG_FAULT_INJECTION_DEBUG_FS
+
+static int __init failslab_debugfs_init(void)
+{
+ mode_t mode = S_IFREG | S_IRUSR | S_IWUSR;
+ struct dentry *dir;
+ int err;
+
+ err = init_fault_attr_dentries(&failslab.attr, "failslab");
+ if (err)
+ return err;
+ dir = failslab.attr.dentries.dir;
+
+ failslab.ignore_gfp_wait_file =
+ debugfs_create_bool("ignore-gfp-wait", mode, dir,
+ &failslab.ignore_gfp_wait);
+
+ if (!failslab.ignore_gfp_wait_file) {
+ err = -ENOMEM;
+ debugfs_remove(failslab.ignore_gfp_wait_file);
+ cleanup_fault_attr_dentries(&failslab.attr);
+ }
+
+ return err;
+}
+
+late_initcall(failslab_debugfs_init);
+
+#endif /* CONFIG_FAULT_INJECTION_DEBUG_FS */
diff --git a/mm/memory.c b/mm/memory.c
index f01b7eed6e1..0a2010a9518 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -3075,3 +3075,18 @@ void print_vma_addr(char *prefix, unsigned long ip)
}
up_read(&current->mm->mmap_sem);
}
+
+#ifdef CONFIG_PROVE_LOCKING
+void might_fault(void)
+{
+ might_sleep();
+ /*
+ * it would be nicer only to annotate paths which are not under
+ * pagefault_disable, however that requires a larger audit and
+ * providing helpers like get_user_atomic.
+ */
+ if (!in_atomic() && current->mm)
+ might_lock_read(&current->mm->mmap_sem);
+}
+EXPORT_SYMBOL(might_fault);
+#endif
diff --git a/mm/slab.c b/mm/slab.c
index bcf08ea8838..e0ad07f97f4 100644
--- a/mm/slab.c
+++ b/mm/slab.c
@@ -2132,6 +2132,8 @@ static int __init_refok setup_cpu_cache(struct kmem_cache *cachep)
*
* @name must be valid until the cache is destroyed. This implies that
* the module calling this has to destroy the cache before getting unloaded.
+ * Note that kmem_cache_name() is not guaranteed to return the same pointer,
+ * therefore applications must manage it themselves.
*
* The flags are
*
@@ -2618,7 +2620,7 @@ static struct slab *alloc_slabmgmt(struct kmem_cache *cachep, void *objp,
if (OFF_SLAB(cachep)) {
/* Slab management obj is off-slab. */
slabp = kmem_cache_alloc_node(cachep->slabp_cache,
- local_flags & ~GFP_THISNODE, nodeid);
+ local_flags, nodeid);
if (!slabp)
return NULL;
} else {
@@ -3006,7 +3008,7 @@ retry:
* there must be at least one object available for
* allocation.
*/
- BUG_ON(slabp->inuse < 0 || slabp->inuse >= cachep->num);
+ BUG_ON(slabp->inuse >= cachep->num);
while (slabp->inuse < cachep->num && batchcount--) {
STATS_INC_ALLOCED(cachep);
@@ -3115,79 +3117,14 @@ static void *cache_alloc_debugcheck_after(struct kmem_cache *cachep,
#define cache_alloc_debugcheck_after(a,b,objp,d) (objp)
#endif
-#ifdef CONFIG_FAILSLAB
-
-static struct failslab_attr {
-
- struct fault_attr attr;
-
- u32 ignore_gfp_wait;
-#ifdef CONFIG_FAULT_INJECTION_DEBUG_FS
- struct dentry *ignore_gfp_wait_file;
-#endif
-
-} failslab = {
- .attr = FAULT_ATTR_INITIALIZER,
- .ignore_gfp_wait = 1,
-};
-
-static int __init setup_failslab(char *str)
-{
- return setup_fault_attr(&failslab.attr, str);
-}
-__setup("failslab=", setup_failslab);
-
-static int should_failslab(struct kmem_cache *cachep, gfp_t flags)
+static bool slab_should_failslab(struct kmem_cache *cachep, gfp_t flags)
{
if (cachep == &cache_cache)
- return 0;
- if (flags & __GFP_NOFAIL)
- return 0;
- if (failslab.ignore_gfp_wait && (flags & __GFP_WAIT))
- return 0;
+ return false;
- return should_fail(&failslab.attr, obj_size(cachep));
+ return should_failslab(obj_size(cachep), flags);
}
-#ifdef CONFIG_FAULT_INJECTION_DEBUG_FS
-
-static int __init failslab_debugfs(void)
-{
- mode_t mode = S_IFREG | S_IRUSR | S_IWUSR;
- struct dentry *dir;
- int err;
-
- err = init_fault_attr_dentries(&failslab.attr, "failslab");
- if (err)
- return err;
- dir = failslab.attr.dentries.dir;
-
- failslab.ignore_gfp_wait_file =
- debugfs_create_bool("ignore-gfp-wait", mode, dir,
- &failslab.ignore_gfp_wait);
-
- if (!failslab.ignore_gfp_wait_file) {
- err = -ENOMEM;
- debugfs_remove(failslab.ignore_gfp_wait_file);
- cleanup_fault_attr_dentries(&failslab.attr);
- }
-
- return err;
-}
-
-late_initcall(failslab_debugfs);
-
-#endif /* CONFIG_FAULT_INJECTION_DEBUG_FS */
-
-#else /* CONFIG_FAILSLAB */
-
-static inline int should_failslab(struct kmem_cache *cachep, gfp_t flags)
-{
- return 0;
-}
-
-#endif /* CONFIG_FAILSLAB */
-
static inline void *____cache_alloc(struct kmem_cache *cachep, gfp_t flags)
{
void *objp;
@@ -3390,7 +3327,7 @@ __cache_alloc_node(struct kmem_cache *cachep, gfp_t flags, int nodeid,
unsigned long save_flags;
void *ptr;
- if (should_failslab(cachep, flags))
+ if (slab_should_failslab(cachep, flags))
return NULL;
cache_alloc_debugcheck_before(cachep, flags);
@@ -3466,7 +3403,7 @@ __cache_alloc(struct kmem_cache *cachep, gfp_t flags, void *caller)
unsigned long save_flags;
void *objp;
- if (should_failslab(cachep, flags))
+ if (slab_should_failslab(cachep, flags))
return NULL;
cache_alloc_debugcheck_before(cachep, flags);
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;
generated by cgit v1.2.3-18-g5258 (git 2.32.0) at 2024-11-23 12:02:28 +0000