mm, sl[au]b: create common functions for boot slab creation

Use a special function to create kmalloc caches and use that function in
SLAB and SLUB.

Acked-by: Joonsoo Kim <js1304@gmail.com>
Reviewed-by: Glauber Costa <glommer@parallels.com>
Acked-by: David Rientjes <rientjes@google.com>
Signed-off-by: Christoph Lameter <cl@linux.com>
Signed-off-by: Pekka Enberg <penberg@kernel.org>

1 files changed, 36 insertions, 0 deletions

diff --git a/mm/slab_common.c b/mm/slab_common.c
index b705be7faa48..497b45c25bae 100644
--- a/mm/slab_common.c
+++ b/mm/slab_common.c
@@ -202,6 +202,42 @@ int slab_is_available(void)
         return slab_state >= UP;
 }
 
+#ifndef CONFIG_SLOB
+/* Create a cache during boot when no slab services are available yet */
+void __init create_boot_cache(struct kmem_cache *s, const char *name, size_t size,
+                unsigned long flags)
+{
+        int err;
+
+        s->name = name;
+        s->size = s->object_size = size;
+        s->align = ARCH_KMALLOC_MINALIGN;
+        err = __kmem_cache_create(s, flags);
+
+        if (err)
+                panic("Creation of kmalloc slab %s size=%zd failed. Reason %d\n",
+                                        name, size, err);
+
+        s->refcount = -1;       /* Exempt from merging for now */
+}
+
+struct kmem_cache *__init create_kmalloc_cache(const char *name, size_t size,
+                                unsigned long flags)
+{
+        struct kmem_cache *s = kmem_cache_zalloc(kmem_cache, GFP_NOWAIT);
+
+        if (!s)
+                panic("Out of memory when creating slab %s\n", name);
+
+        create_boot_cache(s, name, size, flags);
+        list_add(&s->list, &slab_caches);
+        s->refcount = 1;
+        return s;
+}
+
+#endif /* !CONFIG_SLOB */
+
+
 #ifdef CONFIG_SLABINFO
 static void print_slabinfo_header(struct seq_file *m)
 {