Unionfs: cleaner support for RT patches

Signed-off-by: Erez Zadok <ezk@cs.sunysb.edu>

diff --git a/fs/unionfs/union.h b/fs/unionfs/union.h
index ddb9b8ba3917421376bb4927448b0dbeaaf250b6..ae277d1f769dd518267a8dd5d5227226d1844a1f 100644 (file)
--- a/fs/unionfs/union.h
+++ b/fs/unionfs/union.h
@@ -79,6 +79,13 @@ extern struct address_space_operations unionfs_aops;
 /* How long should an entry be allowed to persist */
 #define RDCACHE_JIFFIES        (5*HZ)
 
+/* compatibility with Real-Time patches */
+#ifdef CONFIG_PREEMPT_RT
+# define unionfs_rw_semaphore  compat_rw_semaphore
+#else /* not CONFIG_PREEMPT_RT */
+# define unionfs_rw_semaphore  rw_semaphore
+#endif /* not CONFIG_PREEMPT_RT */
+
 /* file private data. */
 struct unionfs_file_info {
        int bstart;
@@ -153,11 +160,7 @@ struct unionfs_sb_info {
         * branch-management is used on a pivot_root'ed union, because we
         * have to ->lookup paths which belong to the same union.
         */
-#ifdef CONFIG_PREEMPT_RT
-       struct compat_rw_semaphore rwsem;
-#else /* not CONFIG_PREEMPT_RT */
-       struct rw_semaphore rwsem;
-#endif /* not CONFIG_PREEMPT_RT */
+       struct unionfs_rw_semaphore rwsem;
        pid_t write_lock_owner; /* PID of rw_sem owner (write lock) */
        int high_branch_id;     /* last unique branch ID given */
        struct unionfs_data *data;