mm, sl[aou]b: Common definition for boot state of the slab allocators

All allocators have some sort of support for the bootstrap status.

Setup a common definition for the boot states and make all slab
allocators use that definition.

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

1 files changed, 5 insertions, 16 deletions

diff --git a/mm/slub.c b/mm/slub.c
index 6551cc9a51f8..4c385164d9f7 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -16,6 +16,7 @@
 #include <linux/interrupt.h>
 #include <linux/bitops.h>
 #include <linux/slab.h>
+#include "slab.h"
 #include <linux/proc_fs.h>
 #include <linux/seq_file.h>
 #include <linux/kmemcheck.h>
@@ -182,13 +183,6 @@ static int kmem_size = sizeof(struct kmem_cache);
 static struct notifier_block slab_notifier;
 #endif
 
-static enum {
-        DOWN,           /* No slab functionality available */
-        PARTIAL,        /* Kmem_cache_node works */
-        UP,             /* Everything works but does not show up in sysfs */
-        SYSFS           /* Sysfs up */
-} slab_state = DOWN;
-
 /* A list of all slab caches on the system */
 static DECLARE_RWSEM(slub_lock);
 static LIST_HEAD(slab_caches);
@@ -237,11 +231,6 @@ static inline void stat(const struct kmem_cache *s, enum stat_item si)
  *                      Core slab cache functions
  *******************************************************************/
 
-int slab_is_available(void)
-{
-        return slab_state >= UP;
-}
-
 static inline struct kmem_cache_node *get_node(struct kmem_cache *s, int node)
 {
         return s->node[node];
@@ -5274,7 +5263,7 @@ static int sysfs_slab_add(struct kmem_cache *s)
         const char *name;
         int unmergeable;
 
-        if (slab_state < SYSFS)
+        if (slab_state < FULL)
                 /* Defer until later */
                 return 0;
 
@@ -5319,7 +5308,7 @@ static int sysfs_slab_add(struct kmem_cache *s)
 
 static void sysfs_slab_remove(struct kmem_cache *s)
 {
-        if (slab_state < SYSFS)
+        if (slab_state < FULL)
                 /*
                  * Sysfs has not been setup yet so no need to remove the
                  * cache from sysfs.
@@ -5347,7 +5336,7 @@ static int sysfs_slab_alias(struct kmem_cache *s, const char *name)
 {
         struct saved_alias *al;
 
-        if (slab_state == SYSFS) {
+        if (slab_state == FULL) {
                 /*
                  * If we have a leftover link then remove it.
                  */
@@ -5380,7 +5369,7 @@ static int __init slab_sysfs_init(void)
                 return -ENOSYS;
         }
 
-        slab_state = SYSFS;
+        slab_state = FULL;
 
         list_for_each_entry(s, &slab_caches, list) {
                 err = sysfs_slab_add(s);