Linux-libre 4.6.2-gnu

1 files changed, 94 insertions, 5 deletions

diff --git a/mm/slab.h b/mm/slab.h
index 2eedacea4..5969769fb 100644
--- a/mm/slab.h
+++ b/mm/slab.h
@@ -38,6 +38,10 @@ struct kmem_cache {
 #endif
 
 #include <linux/memcontrol.h>
+#include <linux/fault-inject.h>
+#include <linux/kmemcheck.h>
+#include <linux/kasan.h>
+#include <linux/kmemleak.h>
 
 /*
  * State of the slab allocator.
@@ -121,7 +125,7 @@ static inline unsigned long kmem_cache_flags(unsigned long object_size,
 #define SLAB_DEBUG_FLAGS (SLAB_RED_ZONE | SLAB_POISON | SLAB_STORE_USER)
 #elif defined(CONFIG_SLUB_DEBUG)
 #define SLAB_DEBUG_FLAGS (SLAB_RED_ZONE | SLAB_POISON | SLAB_STORE_USER | \
-			  SLAB_TRACE | SLAB_DEBUG_FREE)
+			  SLAB_TRACE | SLAB_CONSISTENCY_CHECKS)
 #else
 #define SLAB_DEBUG_FLAGS (0)
 #endif
@@ -168,7 +172,7 @@ ssize_t slabinfo_write(struct file *file, const char __user *buffer,
 /*
  * Generic implementation of bulk operations
  * These are useful for situations in which the allocator cannot
- * perform optimizations. In that case segments of the objecct listed
+ * perform optimizations. In that case segments of the object listed
  * may be allocated or freed using these operations.
  */
 void __kmem_cache_free_bulk(struct kmem_cache *, size_t, void **);
@@ -242,12 +246,33 @@ static __always_inline int memcg_charge_slab(struct page *page,
 					     gfp_t gfp, int order,
 					     struct kmem_cache *s)
 {
+	int ret;
+
 	if (!memcg_kmem_enabled())
 		return 0;
 	if (is_root_cache(s))
 		return 0;
-	return __memcg_kmem_charge_memcg(page, gfp, order,
-					 s->memcg_params.memcg);
+
+	ret = __memcg_kmem_charge_memcg(page, gfp, order,
+					s->memcg_params.memcg);
+	if (ret)
+		return ret;
+
+	memcg_kmem_update_page_stat(page,
+			(s->flags & SLAB_RECLAIM_ACCOUNT) ?
+			MEMCG_SLAB_RECLAIMABLE : MEMCG_SLAB_UNRECLAIMABLE,
+			1 << order);
+	return 0;
+}
+
+static __always_inline void memcg_uncharge_slab(struct page *page, int order,
+						struct kmem_cache *s)
+{
+	memcg_kmem_update_page_stat(page,
+			(s->flags & SLAB_RECLAIM_ACCOUNT) ?
+			MEMCG_SLAB_RECLAIMABLE : MEMCG_SLAB_UNRECLAIMABLE,
+			-(1 << order));
+	memcg_kmem_uncharge(page, order);
 }
 
 extern void slab_init_memcg_params(struct kmem_cache *);
@@ -290,6 +315,11 @@ static inline int memcg_charge_slab(struct page *page, gfp_t gfp, int order,
 	return 0;
 }
 
+static inline void memcg_uncharge_slab(struct page *page, int order,
+				       struct kmem_cache *s)
+{
+}
+
 static inline void slab_init_memcg_params(struct kmem_cache *s)
 {
 }
@@ -307,7 +337,8 @@ static inline struct kmem_cache *cache_from_obj(struct kmem_cache *s, void *x)
 	 * to not do even the assignment. In that case, slab_equal_or_root
 	 * will also be a constant.
 	 */
-	if (!memcg_kmem_enabled() && !unlikely(s->flags & SLAB_DEBUG_FREE))
+	if (!memcg_kmem_enabled() &&
+	    !unlikely(s->flags & SLAB_CONSISTENCY_CHECKS))
 		return s;
 
 	page = virt_to_head_page(x);
@@ -321,6 +352,64 @@ static inline struct kmem_cache *cache_from_obj(struct kmem_cache *s, void *x)
 	return s;
 }
 
+static inline size_t slab_ksize(const struct kmem_cache *s)
+{
+#ifndef CONFIG_SLUB
+	return s->object_size;
+
+#else /* CONFIG_SLUB */
+# ifdef CONFIG_SLUB_DEBUG
+	/*
+	 * Debugging requires use of the padding between object
+	 * and whatever may come after it.
+	 */
+	if (s->flags & (SLAB_RED_ZONE | SLAB_POISON))
+		return s->object_size;
+# endif
+	/*
+	 * If we have the need to store the freelist pointer
+	 * back there or track user information then we can
+	 * only use the space before that information.
+	 */
+	if (s->flags & (SLAB_DESTROY_BY_RCU | SLAB_STORE_USER))
+		return s->inuse;
+	/*
+	 * Else we can use all the padding etc for the allocation
+	 */
+	return s->size;
+#endif
+}
+
+static inline struct kmem_cache *slab_pre_alloc_hook(struct kmem_cache *s,
+						     gfp_t flags)
+{
+	flags &= gfp_allowed_mask;
+	lockdep_trace_alloc(flags);
+	might_sleep_if(gfpflags_allow_blocking(flags));
+
+	if (should_failslab(s, flags))
+		return NULL;
+
+	return memcg_kmem_get_cache(s, flags);
+}
+
+static inline void slab_post_alloc_hook(struct kmem_cache *s, gfp_t flags,
+					size_t size, void **p)
+{
+	size_t i;
+
+	flags &= gfp_allowed_mask;
+	for (i = 0; i < size; i++) {
+		void *object = p[i];
+
+		kmemcheck_slab_alloc(s, flags, object, slab_ksize(s));
+		kmemleak_alloc_recursive(object, s->object_size, 1,
+					 s->flags, flags);
+		kasan_slab_alloc(s, object, flags);
+	}
+	memcg_kmem_put_cache(s);
+}
+
 #ifndef CONFIG_SLOB
 /*
  * The slab lists for all objects.