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>

1 files changed, 7 insertions, 1 deletions

diff --git a/include/linux/lglock.h b/include/linux/lglock.h
index 8f974517c48a..0d24e932db0b 100644
--- a/include/linux/lglock.h
+++ b/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);