idr: create idr_layer_cache at boot time
Avoid a possible kmem_cache_create() failure by creating idr_layer_cache
unconditionary at boot time rather than creating it on-demand when idr_init()
is called the first time.
This change also enables us to eliminate the check every time idr_init() is
called.
[akpm@linux-foundation.org: rename init_id_cache() to idr_init_cache()]
[akpm@linux-foundation.org: fix alpha build]
Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/include/linux/idr.h b/include/linux/idr.h
index 0edda41..9a2d762 100644
--- a/include/linux/idr.h
+++ b/include/linux/idr.h
@@ -14,6 +14,7 @@
#include <linux/types.h>
#include <linux/bitops.h>
+#include <linux/init.h>
#if BITS_PER_LONG == 32
# define IDR_BITS 5
@@ -115,4 +116,6 @@
void ida_destroy(struct ida *ida);
void ida_init(struct ida *ida);
+void __init idr_init_cache(void);
+
#endif /* __IDR_H__ */