turn inode_cachep static-duration

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

fs/inode.c

diff --git a/fs/inode.c b/fs/inode.c
index 5213832..7c21269 100644
--- a/fs/inode.c
+++ b/fs/inode.c
@@ -23,6 +23,7 @@
 #include <linux/rw_hint.h>
 #include <linux/seq_file.h>
 #include <linux/debugfs.h>
+#include <linux/slab-static.h>
 #include <trace/events/writeback.h>
 #define CREATE_TRACE_POINTS
 #include <trace/events/timestamp.h>
@@ -76,7 +77,8 @@ EXPORT_SYMBOL(empty_aops);
 static DEFINE_PER_CPU(unsigned long, nr_inodes);
 static DEFINE_PER_CPU(unsigned long, nr_unused);
 
-static struct kmem_cache *inode_cachep __ro_after_init;
+static struct kmem_cache_opaque inode_cache;
+#define inode_cachep to_kmem_cache(&inode_cache)
 
 static long get_nr_inodes(void)
 {
@@ -2564,7 +2566,7 @@ void __init inode_init_early(void)
 void __init inode_init(void)
 {
 	/* inode slab cache */
-	inode_cachep = kmem_cache_create("inode_cache",
+	kmem_cache_setup(inode_cachep, "inode_cache",
 					 sizeof(struct inode),
 					 0,
 					 (SLAB_RECLAIM_ACCOUNT|SLAB_PANIC|