---

yaml
---
r: 215937
b: refs/heads/master
c: c016b0b
h: refs/heads/master
i:
  215935: 497a1c2
v: v3

[refs]

@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 51df1142816e469173889fb6d6dc810be9b9e022
+refs/heads/master: c016b0bdeee74a7fbe5179937c0d667eabcf379e

trunk/mm/slub.c

@@ -790,6 +790,37 @@ static void trace(struct kmem_cache *s, struct page *page, void *object,
 	}
 }
 
+/*
+ * Hooks for other subsystems that check memory allocations. In a typical
+ * production configuration these hooks all should produce no code at all.
+ */
+static inline int slab_pre_alloc_hook(struct kmem_cache *s, gfp_t flags)
+{
+	lockdep_trace_alloc(flags);
+	might_sleep_if(flags & __GFP_WAIT);
+
+	return should_failslab(s->objsize, flags, s->flags);
+}
+
+static inline void slab_post_alloc_hook(struct kmem_cache *s, gfp_t flags, void *object)
+{
+	kmemcheck_slab_alloc(s, flags, object, s->objsize);
+	kmemleak_alloc_recursive(object, s->objsize, 1, s->flags, flags);
+}
+
+static inline void slab_free_hook(struct kmem_cache *s, void *x)
+{
+	kmemleak_free_recursive(x, s->flags);
+}
+
+static inline void slab_free_hook_irq(struct kmem_cache *s, void *object)
+{
+	kmemcheck_slab_free(s, object, s->objsize);
+	debug_check_no_locks_freed(object, s->objsize);
+	if (!(s->flags & SLAB_DEBUG_OBJECTS))
+		debug_check_no_obj_freed(object, s->objsize);
+}
+
 /*
  * Tracking of fully allocated slabs for debugging purposes.
  */
@@ -1696,10 +1727,7 @@ static __always_inline void *slab_alloc(struct kmem_cache *s,
 
 	gfpflags &= gfp_allowed_mask;
 
-	lockdep_trace_alloc(gfpflags);
-	might_sleep_if(gfpflags & __GFP_WAIT);
-
-	if (should_failslab(s->objsize, gfpflags, s->flags))
+	if (slab_pre_alloc_hook(s, gfpflags))
 		return NULL;
 
 	local_irq_save(flags);
@@ -1718,8 +1746,7 @@ static __always_inline void *slab_alloc(struct kmem_cache *s,
 	if (unlikely(gfpflags & __GFP_ZERO) && object)
 		memset(object, 0, s->objsize);
 
-	kmemcheck_slab_alloc(s, gfpflags, object, s->objsize);
-	kmemleak_alloc_recursive(object, s->objsize, 1, s->flags, gfpflags);
+	slab_post_alloc_hook(s, gfpflags, object);
 
 	return object;
 }
@@ -1849,13 +1876,13 @@ static __always_inline void slab_free(struct kmem_cache *s,
 	struct kmem_cache_cpu *c;
 	unsigned long flags;
 
-	kmemleak_free_recursive(x, s->flags);
+	slab_free_hook(s, x);
+
 	local_irq_save(flags);
 	c = __this_cpu_ptr(s->cpu_slab);
-	kmemcheck_slab_free(s, object, s->objsize);
-	debug_check_no_locks_freed(object, s->objsize);
-	if (!(s->flags & SLAB_DEBUG_OBJECTS))
-		debug_check_no_obj_freed(object, s->objsize);
+
+	slab_free_hook_irq(s, x);
+
 	if (likely(page == c->page && c->node >= 0)) {
 		set_freepointer(s, object, c->freelist);
 		c->freelist = object;