mm/sl[aou]b: Move kmallocXXX functions to common code

The kmalloc* functions of all slab allcoators are similar now so
lets move them into slab.h. This requires some function naming changes
in slob.

As a results of this patch there is a common set of functions for
all allocators. Also means that kmalloc_large() is now available
in general to perform large order allocations that go directly
via the page allocator. kmalloc_large() can be substituted if
kmalloc() throws warnings because of too large allocations.

kmalloc_large() has exactly the same semantics as kmalloc but
can only used for allocations > PAGE_SIZE.

Signed-off-by: Christoph Lameter <cl@linux.com>
Signed-off-by: Pekka Enberg <penberg@kernel.org>

4 files changed, 124 insertions, 266 deletions

diff --git a/include/linux/slab.h b/include/linux/slab.h
index 6c5cc0ea8713..386af639dcaa 100644
--- a/include/linux/slab.h
+++ b/include/linux/slab.h
@@ -4,6 +4,8 @@
  * (C) SGI 2006, Christoph Lameter
  *      Cleaned up and restructured to ease the addition of alternative
  *      implementations of SLAB allocators.
+ * (C) Linux Foundation 2008-2013
+ *      Unified interface for all slab allocators
  */
 
 #ifndef _LINUX_SLAB_H
@@ -94,6 +96,7 @@
 #define ZERO_OR_NULL_PTR(x) ((unsigned long)(x) <= \
                                 (unsigned long)ZERO_SIZE_PTR)
 
+#include <linux/kmemleak.h>
 
 struct mem_cgroup;
 /*
@@ -289,6 +292,57 @@ static __always_inline int kmalloc_index(size_t size)
 }
 #endif /* !CONFIG_SLOB */
 
+void *__kmalloc(size_t size, gfp_t flags);
+void *kmem_cache_alloc(struct kmem_cache *, gfp_t flags);
+
+#ifdef CONFIG_NUMA
+void *__kmalloc_node(size_t size, gfp_t flags, int node);
+void *kmem_cache_alloc_node(struct kmem_cache *, gfp_t flags, int node);
+#else
+static __always_inline void *__kmalloc_node(size_t size, gfp_t flags, int node)
+{
+        return __kmalloc(size, flags);
+}
+
+static __always_inline void *kmem_cache_alloc_node(struct kmem_cache *s, gfp_t flags, int node)
+{
+        return kmem_cache_alloc(s, flags);
+}
+#endif
+
+#ifdef CONFIG_TRACING
+extern void *kmem_cache_alloc_trace(struct kmem_cache *, gfp_t, size_t);
+
+#ifdef CONFIG_NUMA
+extern void *kmem_cache_alloc_node_trace(struct kmem_cache *s,
+                                           gfp_t gfpflags,
+                                           int node, size_t size);
+#else
+static __always_inline void *
+kmem_cache_alloc_node_trace(struct kmem_cache *s,
+                              gfp_t gfpflags,
+                              int node, size_t size)
+{
+        return kmem_cache_alloc_trace(s, gfpflags, size);
+}
+#endif /* CONFIG_NUMA */
+
+#else /* CONFIG_TRACING */
+static __always_inline void *kmem_cache_alloc_trace(struct kmem_cache *s,
+                gfp_t flags, size_t size)
+{
+        return kmem_cache_alloc(s, flags);
+}
+
+static __always_inline void *
+kmem_cache_alloc_node_trace(struct kmem_cache *s,
+                              gfp_t gfpflags,
+                              int node, size_t size)
+{
+        return kmem_cache_alloc_node(s, gfpflags, node);
+}
+#endif /* CONFIG_TRACING */
+
 #ifdef CONFIG_SLAB
 #include <linux/slab_def.h>
 #endif
@@ -297,9 +351,60 @@ static __always_inline int kmalloc_index(size_t size)
 #include <linux/slub_def.h>
 #endif
 
-#ifdef CONFIG_SLOB
-#include <linux/slob_def.h>
+static __always_inline void *
+kmalloc_order(size_t size, gfp_t flags, unsigned int order)
+{
+        void *ret;
+
+        flags |= (__GFP_COMP | __GFP_KMEMCG);
+        ret = (void *) __get_free_pages(flags, order);
+        kmemleak_alloc(ret, size, 1, flags);
+        return ret;
+}
+
+#ifdef CONFIG_TRACING
+extern void *kmalloc_order_trace(size_t size, gfp_t flags, unsigned int order);
+#else
+static __always_inline void *
+kmalloc_order_trace(size_t size, gfp_t flags, unsigned int order)
+{
+        return kmalloc_order(size, flags, order);
+}
+#endif
+
+static __always_inline void *kmalloc_large(size_t size, gfp_t flags)
+{
+        unsigned int order = get_order(size);
+        return kmalloc_order_trace(size, flags, order);
+}
+
+/**
+ * kmalloc - allocate memory
+ * @size: how many bytes of memory are required.
+ * @flags: the type of memory to allocate (see kcalloc).
+ *
+ * kmalloc is the normal method of allocating memory
+ * for objects smaller than page size in the kernel.
+ */
+static __always_inline void *kmalloc(size_t size, gfp_t flags)
+{
+        if (__builtin_constant_p(size)) {
+                if (size > KMALLOC_MAX_CACHE_SIZE)
+                        return kmalloc_large(size, flags);
+#ifndef CONFIG_SLOB
+                if (!(flags & GFP_DMA)) {
+                        int index = kmalloc_index(size);
+
+                        if (!index)
+                                return ZERO_SIZE_PTR;
+
+                        return kmem_cache_alloc_trace(kmalloc_caches[index],
+                                        flags, size);
+                }
 #endif
+        }
+        return __kmalloc(size, flags);
+}
 
 /*
  * Determine size used for the nth kmalloc cache.
@@ -321,6 +426,23 @@ static __always_inline int kmalloc_size(int n)
         return 0;
 }
 
+static __always_inline void *kmalloc_node(size_t size, gfp_t flags, int node)
+{
+#ifndef CONFIG_SLOB
+        if (__builtin_constant_p(size) &&
+                size <= KMALLOC_MAX_CACHE_SIZE && !(flags & SLAB_CACHE_DMA)) {
+                int i = kmalloc_index(size);
+
+                if (!i)
+                        return ZERO_SIZE_PTR;
+
+                return kmem_cache_alloc_node_trace(kmalloc_caches[i],
+                                                flags, node, size);
+        }
+#endif
+        return __kmalloc_node(size, flags, node);
+}
+
 /*
  * Setting ARCH_SLAB_MINALIGN in arch headers allows a different alignment.
  * Intended for arches that get misalignment faults even for 64 bit integer
@@ -451,36 +573,6 @@ static inline void *kcalloc(size_t n, size_t size, gfp_t flags)
         return kmalloc_array(n, size, flags | __GFP_ZERO);
 }
 
-#if !defined(CONFIG_NUMA) && !defined(CONFIG_SLOB)
-/**
- * kmalloc_node - allocate memory from a specific node
- * @size: how many bytes of memory are required.
- * @flags: the type of memory to allocate (see kmalloc).
- * @node: node to allocate from.
- *
- * kmalloc() for non-local nodes, used to allocate from a specific node
- * if available. Equivalent to kmalloc() in the non-NUMA single-node
- * case.
- */
-static inline void *kmalloc_node(size_t size, gfp_t flags, int node)
-{
-        return kmalloc(size, flags);
-}
-