lglock: add DEFINE_STATIC_LGLOCK()

When the lglock doesn't need to be exported we can use
DEFINE_STATIC_LGLOCK().
Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Cc: Andi Kleen <ak@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

fs/file_table.c

@@ -36,7 +36,7 @@ struct files_stat_struct files_stat = {
 	.max_files = NR_FILE
 };
 
-DEFINE_LGLOCK(files_lglock);
+DEFINE_STATIC_LGLOCK(files_lglock);
 
 /* SLAB cache for file structures */
 static struct kmem_cache *filp_cachep __read_mostly;

include/linux/lglock.h

@@ -32,7 +32,8 @@
 #define br_write_lock(name)	lg_global_lock(name)
 #define br_write_unlock(name)	lg_global_unlock(name)
 
-#define DEFINE_BRLOCK(name)	DEFINE_LGLOCK(name)
+#define DEFINE_BRLOCK(name)		DEFINE_LGLOCK(name)
+#define DEFINE_STATIC_BRLOCK(name)	DEFINE_STATIC_LGLOCK(name)
 
 #ifdef CONFIG_DEBUG_LOCK_ALLOC
 #define LOCKDEP_INIT_MAP lockdep_init_map
@@ -53,6 +54,11 @@ struct lglock {
 	= __ARCH_SPIN_LOCK_UNLOCKED;					\
 	struct lglock name = { .lock = &name ## _lock }
 
+#define DEFINE_STATIC_LGLOCK(name)					\
+	static DEFINE_PER_CPU(arch_spinlock_t, name ## _lock)		\
+	= __ARCH_SPIN_LOCK_UNLOCKED;					\
+	static struct lglock name = { .lock = &name ## _lock }
+
 void lg_lock_init(struct lglock *lg, char *name);
 void lg_local_lock(struct lglock *lg);
 void lg_local_unlock(struct lglock *lg);