[RFC PATCH 03/11] mm/damon/core: make damon_stop() never fails

[SJ Park <sj@kernel.org>]

damon_stop() has no reason to fail.  It returns an error code only for
possible future changes that can make it fail.  Such a change has not
been made yet, and this only makes the error handling complicated and
confusing.  Ensure it returns no error.

Signed-off-by: SJ Park <sj@kernel.org>
---
 mm/damon/core.c | 21 ++++++---------------
 1 file changed, 6 insertions(+), 15 deletions(-)

diff --git a/mm/damon/core.c b/mm/damon/core.c
index 16d9223c33a72..ef40aa44850ff 100644
--- a/mm/damon/core.c
+++ b/mm/damon/core.c
@@ -1925,10 +1925,8 @@ int damon_start(struct damon_ctx **ctxs, int nr_ctxs, bool exclusive)
 /*
  * __damon_stop() - Stops monitoring of a given context.
  * @ctx:	monitoring context
- *
- * Return: 0 on success, negative error code otherwise.
  */
-static int __damon_stop(struct damon_ctx *ctx)
+static void __damon_stop(struct damon_ctx *ctx)
 {
 	struct task_struct *tsk;
 
@@ -1938,31 +1936,24 @@ static int __damon_stop(struct damon_ctx *ctx)
 		get_task_struct(tsk);
 		mutex_unlock(&ctx->kdamond_lock);
 		kthread_stop_put(tsk);
-		return 0;
+		return;
 	}
 	mutex_unlock(&ctx->kdamond_lock);
-
-	return -EPERM;
 }
 
 /**
  * damon_stop() - Stops the monitorings for a given group of contexts.
  * @ctxs:	an array of the pointers for contexts to stop monitoring
  * @nr_ctxs:	size of @ctxs
- *
- * Return: 0 on success, negative error code otherwise.
  */
 int damon_stop(struct damon_ctx **ctxs, int nr_ctxs)
 {
-	int i, err = 0;
+	int i;
 
-	for (i = 0; i < nr_ctxs; i++) {
+	for (i = 0; i < nr_ctxs; i++)
 		/* nr_running_ctxs is decremented in kdamond_fn */
-		err = __damon_stop(ctxs[i]);
-		if (err)
-			break;
-	}
-	return err;
+		__damon_stop(ctxs[i]);
+	return 0;
 }
 
 /**
-- 
2.47.3