cgroup: export css_next_descendant_pre for bfq

Christoph Hellwig · axboe · commit 474a280036e8 · 2019-06-21T02:48:34.000-06:00
The bfq schedule now uses css_next_descendant_pre directly after the stats functionality depending on it has been from the core blk-cgroup code to bfq. Export the symbol so that bfq can still be build modular. Fixes: d625898 ("bfq-iosched: move bfq_stat_recursive_sum into the only caller") Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Jens Axboe <axboe@kernel.dk>
diff --git a/kernel/cgroup/cgroup.c b/kernel/cgroup/cgroup.c
@@ -4221,6 +4221,7 @@ css_next_descendant_pre(struct cgroup_subsys_state *pos,
 
 	return NULL;
 }
+EXPORT_SYMBOL_GPL(css_next_descendant_pre);
 
 /**
  * css_rightmost_descendant - return the rightmost descendant of a css

Original file line number	Diff line number	Diff line change
`@@ -4221,6 +4221,7 @@ css_next_descendant_pre(struct cgroup_subsys_state *pos,`
`4221`	`4221`
`4222`	`4222`	`return NULL;`
`4223`	`4223`	`}`
	`4224`	`+EXPORT_SYMBOL_GPL(css_next_descendant_pre);`
`4224`	`4225`
`4225`	`4226`	`/**`
`4226`	`4227`	`* css_rightmost_descendant - return the rightmost descendant of a css`