hide spinlock in linux/quota.h behind __KERNEL__

Signed-off-by: Mike Frysinger <vapier@gentoo.org>
Acked-by: Jan Kara <jack@ucw.cz>
Cc: David Woodhouse <dwmw2@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

include/linux/quota.h

@@ -44,8 +44,6 @@
 typedef __kernel_uid32_t qid_t; /* Type in which we store ids in memory */
 typedef __u64 qsize_t;          /* Type in which we store sizes */
 
-extern spinlock_t dq_data_lock;
-
 /* Size of blocks in which are counted size limits */
 #define QUOTABLOCK_BITS 10
 #define QUOTABLOCK_SIZE (1 << QUOTABLOCK_BITS)
@@ -139,6 +137,8 @@ struct if_dqinfo {
 #include <linux/dqblk_v1.h>
 #include <linux/dqblk_v2.h>
 
+extern spinlock_t dq_data_lock;
+
 /* Maximal numbers of writes for quota operation (insert/delete/update)
  * (over VFS all formats) */
 #define DQUOT_INIT_ALLOC max(V1_INIT_ALLOC, V2_INIT_ALLOC)