[PATCH 18.5/24] blkcg: export __blkg_prfill_rwstat() take#2

[Tejun Heo <tj-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>]

Hierarchical stats for cfq-iosched will need __blkg_prfill_rwstat().
Export it.

Signed-off-by: Tejun Heo <tj-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
Reported-by: Fengguang Wu <fengguang.wu-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
---
Fengguang's build test discovered that cfq now uses
__blkg_prfill_rwstat() which isn't exported leading to build failures
when cfq is built as a module.  Export it.  This doesn't affect
!module builds.  Git branch updated accordingly.

Thanks.

 block/blk-cgroup.c |    1 +
 1 file changed, 1 insertion(+)

--- a/block/blk-cgroup.c
+++ b/block/blk-cgroup.c
@@ -552,6 +552,7 @@ u64 __blkg_prfill_rwstat(struct seq_file
 	seq_printf(sf, "%s Total %llu\n", dname, (unsigned long long)v);
 	return v;
 }
+EXPORT_SYMBOL_GPL(__blkg_prfill_rwstat);
 
 /**
  * blkg_prfill_stat - prfill callback for blkg_stat