Branch b1_6

b=16949
i=yury, deen

Add labs(x) as a inline function because absent since 2.6.22.

lustre/include/linux/lustre_compat25.h

@@ -590,5 +590,19 @@ int ll_unregister_blkdev(unsigned int dev, const char *name)
                 vfs_rename(old,old_dir,new,new_dir)
 #endif
 
+#ifndef abs
+static inline int abs(int x)
+{
+        return (x < 0) ? -x : x;
+}
+#endif
+
+#ifndef labs
+static inline long labs(long x)
+{
+        return (x < 0) ? -x : x;
+}
+#endif
+
 #endif /* __KERNEL__ */
 #endif /* _COMPAT25_H */