[PATCH 2/2] mm/damon/core: remove unused damon_nr_running_ctxs()

damon_nr_running_ctxs() has had no in-tree users since commit
5ec4333b1967 ("mm/damon: remove DAMON debugfs interface") removed
all of its callers.

Remove the unused declaration and definition.

Signed-off-by: Cheng-Han Wu <[email protected]>
---
 include/linux/damon.h |  1 -
 mm/damon/core.c       | 14 --------------
 2 files changed, 15 deletions(-)

diff --git a/include/linux/damon.h b/include/linux/damon.h
index 8e5589ccf50f..50659c9083a9 100644
--- a/include/linux/damon.h
+++ b/include/linux/damon.h
@@ -1064,7 +1064,6 @@ int damon_set_attrs(struct damon_ctx *ctx, struct damon_attrs *attrs);
 void damon_set_schemes(struct damon_ctx *ctx,
 			struct damos **schemes, ssize_t nr_schemes);
 int damon_commit_ctx(struct damon_ctx *old_ctx, struct damon_ctx *new_ctx);
-int damon_nr_running_ctxs(void);
 bool damon_is_registered_ops(enum damon_ops_id id);
 int damon_register_ops(struct damon_operations *ops);
 int damon_select_ops(struct damon_ctx *ctx, enum damon_ops_id id);
diff --git a/mm/damon/core.c b/mm/damon/core.c
index da97b2dc39d1..891f851bcbbf 100644
--- a/mm/damon/core.c
+++ b/mm/damon/core.c
@@ -1847,20 +1847,6 @@ int damon_commit_ctx(struct damon_ctx *dst, struct damon_ctx *src)
 	return err;
 }
 
-/**
- * damon_nr_running_ctxs() - Return number of currently running contexts.
- */
-int damon_nr_running_ctxs(void)
-{
-	int nr_ctxs;
-
-	mutex_lock(&damon_lock);
-	nr_ctxs = nr_running_ctxs;
-	mutex_unlock(&damon_lock);
-
-	return nr_ctxs;
-}
-
 /* Returns the size upper limit for each monitoring region */
 static unsigned long damon_region_sz_limit(struct damon_ctx *ctx)
 {
-- 
2.52.0