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__ */
diff --git a/init/main.c b/init/main.c
index c62c98f..624266b 100644
--- a/init/main.c
+++ b/init/main.c
@@ -58,6 +58,7 @@
#include <linux/kthread.h>
#include <linux/sched.h>
#include <linux/signal.h>
+#include <linux/idr.h>
#include <asm/io.h>
#include <asm/bugs.h>
@@ -637,6 +638,7 @@
enable_debug_pagealloc();
cpu_hotplug_init();
kmem_cache_init();
+ idr_init_cache();
setup_per_cpu_pageset();
numa_policy_init();
if (late_time_init)
diff --git a/lib/idr.c b/lib/idr.c
index afbb0b1..8368c81 100644
--- a/lib/idr.c
+++ b/lib/idr.c
@@ -585,12 +585,11 @@
memset(idr_layer, 0, sizeof(struct idr_layer));
}
-static int init_id_cache(void)
+void __init idr_init_cache(void)
{
- if (!idr_layer_cache)
- idr_layer_cache = kmem_cache_create("idr_layer_cache",
- sizeof(struct idr_layer), 0, 0, idr_cache_ctor);
- return 0;
+ idr_layer_cache = kmem_cache_create("idr_layer_cache",
+ sizeof(struct idr_layer), 0, SLAB_PANIC,
+ idr_cache_ctor);
}
/**
@@ -602,7 +601,6 @@
*/
void idr_init(struct idr *idp)
{
- init_id_cache();
memset(idp, 0, sizeof(struct idr));
spin_lock_init(&idp->lock);
}