From 11c7aec2a9b4e685bbf6a15148e7841b3525fc0c Mon Sep 17 00:00:00 2001
From: Jesper Dangaard Brouer
Date: Tue, 15 Mar 2016 14:53:35 -0700
Subject: mm/slab: move SLUB alloc hooks to common mm/slab.h

First step towards sharing alloc_hook's between SLUB and SLAB
allocators.  Move the SLUB allocators *_alloc_hook to the common
mm/slab.h for internal slab definitions.

Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com>
Cc: Christoph Lameter <cl@linux.com>
Cc: Pekka Enberg <penberg@kernel.org>
Cc: David Rientjes <rientjes@google.com>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Cc: Vladimir Davydov <vdavydov@virtuozzo.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---
 mm/slab.h | 62 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 62 insertions(+)

(limited to 'mm/slab.h')

diff --git a/mm/slab.h b/mm/slab.h
index 2eedacea439d..fd231c9f5f93 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.
@@ -321,6 +325,64 @@ 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->object_size, flags, 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);
+	}
+	memcg_kmem_put_cache(s);
+}
+
 #ifndef CONFIG_SLOB
 /*
  * The slab lists for all objects.
-- 
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