#include <linux/math64.h>
#include <linux/fault-inject.h>
#include <linux/stacktrace.h>
+#include <linux/prefetch.h>
#include <trace/events/kmem.h>
return *(void **)(object + s->offset);
}
+static void prefetch_freepointer(const struct kmem_cache *s, void *object)
+{
+ prefetch(object + s->offset);
+}
+
static inline void *get_freepointer_safe(struct kmem_cache *s, void *object)
{
void *p;
const char *n)
{
VM_BUG_ON(!irqs_disabled());
-#ifdef CONFIG_CMPXCHG_DOUBLE
+#if defined(CONFIG_HAVE_CMPXCHG_DOUBLE) && \
+ defined(CONFIG_HAVE_ALIGNED_STRUCT_PAGE)
if (s->flags & __CMPXCHG_DOUBLE) {
if (cmpxchg_double(&page->freelist, &page->counters,
freelist_old, counters_old,
void *freelist_new, unsigned long counters_new,
const char *n)
{
-#ifdef CONFIG_CMPXCHG_DOUBLE
+#if defined(CONFIG_HAVE_CMPXCHG_DOUBLE) && \
+ defined(CONFIG_HAVE_ALIGNED_STRUCT_PAGE)
if (s->flags & __CMPXCHG_DOUBLE) {
if (cmpxchg_double(&page->freelist, &page->counters,
freelist_old, counters_old,
object = __slab_alloc(s, gfpflags, node, addr, c);
else {
+ void *next_object = get_freepointer_safe(s, object);
+
/*
* The cmpxchg will only match if there was no additional
* operation and if we are on the right processor.
if (unlikely(!this_cpu_cmpxchg_double(
s->cpu_slab->freelist, s->cpu_slab->tid,
object, tid,
- get_freepointer_safe(s, object), next_tid(tid)))) {
+ next_object, next_tid(tid)))) {
note_cmpxchg_failure("slab_alloc", s, tid);
goto redo;
}
+ prefetch_freepointer(s, next_object);
stat(s, ALLOC_FASTPATH);
}
}
}
-#ifdef CONFIG_CMPXCHG_DOUBLE
+#if defined(CONFIG_HAVE_CMPXCHG_DOUBLE) && \
+ defined(CONFIG_HAVE_ALIGNED_STRUCT_PAGE)
if (system_has_cmpxchg_double() && (s->flags & SLAB_DEBUG_FLAGS) == 0)
/* Enable fast mode */
s->flags |= __CMPXCHG_DOUBLE;
if (kmem_cache_open(s, n,
size, align, flags, ctor)) {
list_add(&s->list, &slab_caches);
+ up_write(&slub_lock);
if (sysfs_slab_add(s)) {
+ down_write(&slub_lock);
list_del(&s->list);
kfree(n);
kfree(s);
goto err;
}
- up_write(&slub_lock);
return s;
}
kfree(n);