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authorChristoph Lameter <cl@linux.com>2012-07-06 15:25:10 -0500
committerPekka Enberg <penberg@kernel.org>2012-07-09 12:13:30 +0300
commit039363f38bfe5f6281e9eae5e0518b11577d9d50 (patch)
tree11aa16feccb68b035aa9e9f390a54e57fa2ffd83 /mm/slab_common.c
parent068ce415bea9e2b96bde76dc1bf6e672a89903ee (diff)
downloadop-kernel-dev-039363f38bfe5f6281e9eae5e0518b11577d9d50.zip
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mm, sl[aou]b: Extract common code for kmem_cache_create()
Kmem_cache_create() does a variety of sanity checks but those vary depending on the allocator. Use the strictest tests and put them into a slab_common file. Make the tests conditional on CONFIG_DEBUG_VM. This patch has the effect of adding sanity checks for SLUB and SLOB under CONFIG_DEBUG_VM and removes the checks in SLAB for !CONFIG_DEBUG_VM. Signed-off-by: Christoph Lameter <cl@linux.com> Signed-off-by: Pekka Enberg <penberg@kernel.org>
Diffstat (limited to 'mm/slab_common.c')
-rw-r--r--mm/slab_common.c68
1 files changed, 68 insertions, 0 deletions
diff --git a/mm/slab_common.c b/mm/slab_common.c
new file mode 100644
index 0000000..80412be
--- /dev/null
+++ b/mm/slab_common.c
@@ -0,0 +1,68 @@
+/*
+ * Slab allocator functions that are independent of the allocator strategy
+ *
+ * (C) 2012 Christoph Lameter <cl@linux.com>
+ */
+#include <linux/slab.h>
+
+#include <linux/mm.h>
+#include <linux/poison.h>
+#include <linux/interrupt.h>
+#include <linux/memory.h>
+#include <linux/compiler.h>
+#include <linux/module.h>
+
+#include <asm/cacheflush.h>
+#include <asm/tlbflush.h>
+#include <asm/page.h>
+
+/*
+ * kmem_cache_create - Create a cache.
+ * @name: A string which is used in /proc/slabinfo to identify this cache.
+ * @size: The size of objects to be created in this cache.
+ * @align: The required alignment for the objects.
+ * @flags: SLAB flags
+ * @ctor: A constructor for the objects.
+ *
+ * Returns a ptr to the cache on success, NULL on failure.
+ * Cannot be called within a interrupt, but can be interrupted.
+ * The @ctor is run when new pages are allocated by the cache.
+ *
+ * The flags are
+ *
+ * %SLAB_POISON - Poison the slab with a known test pattern (a5a5a5a5)
+ * to catch references to uninitialised memory.
+ *
+ * %SLAB_RED_ZONE - Insert `Red' zones around the allocated memory to check
+ * for buffer overruns.
+ *
+ * %SLAB_HWCACHE_ALIGN - Align the objects in this cache to a hardware
+ * cacheline. This can be beneficial if you're counting cycles as closely
+ * as davem.
+ */
+
+struct kmem_cache *kmem_cache_create(const char *name, size_t size, size_t align,
+ unsigned long flags, void (*ctor)(void *))
+{
+ struct kmem_cache *s = NULL;
+
+#ifdef CONFIG_DEBUG_VM
+ if (!name || in_interrupt() || size < sizeof(void *) ||
+ size > KMALLOC_MAX_SIZE) {
+ printk(KERN_ERR "kmem_cache_create(%s) integrity check"
+ " failed\n", name);
+ goto out;
+ }
+#endif
+
+ s = __kmem_cache_create(name, size, align, flags, ctor);
+
+#ifdef CONFIG_DEBUG_VM
+out:
+#endif
+ if (!s && (flags & SLAB_PANIC))
+ panic("kmem_cache_create: Failed to create slab '%s'\n", name);
+
+ return s;
+}
+EXPORT_SYMBOL(kmem_cache_create);
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