slub: include include for prefetch

[platform/adaptation/renesas_rcar/renesas_kernel.git] / mm / slub.c

diff --git a/mm/slub.c b/mm/slub.c
index 4907563..b6666eb 100644 (file)
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -29,6 +29,7 @@
 #include <linux/math64.h>
 #include <linux/fault-inject.h>
 #include <linux/stacktrace.h>
+#include <linux/prefetch.h>
 
 #include <trace/events/kmem.h>
 
@@ -269,6 +270,11 @@ static inline void *get_freepointer(struct kmem_cache *s, void *object)
        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;
@@ -2309,6 +2315,8 @@ redo:
                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.
@@ -2324,11 +2332,12 @@ redo:
                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);
        }
 
@@ -3929,13 +3938,14 @@ struct kmem_cache *kmem_cache_create(const char *name, size_t size,
                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);