linux-kernel - [PATCH] mm/damon: remove return value from before

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Date:   Fri, 29 Oct 2021 08:50:23 +0800
From:   Changbin Du <changbin.du@...il.com>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     SeongJae Park <sj@...nel.org>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, Changbin Du <changbin.du@...il.com>
Subject: [PATCH] mm/damon: remove return value from before_terminate callback

Since the return value of 'before_terminate' callback is never used,
we make it have no return value.

Signed-off-by: Changbin Du <changbin.du@...il.com>
---
 include/linux/damon.h | 2 +-
 mm/damon/dbgfs.c      | 5 ++---
 2 files changed, 3 insertions(+), 4 deletions(-)

diff --git a/include/linux/damon.h b/include/linux/damon.h
index 50c6eb0dee1f..041966786270 100644
--- a/include/linux/damon.h
+++ b/include/linux/damon.h
@@ -322,7 +322,7 @@ struct damon_callback {
 	int (*before_start)(struct damon_ctx *context);
 	int (*after_sampling)(struct damon_ctx *context);
 	int (*after_aggregation)(struct damon_ctx *context);
-	int (*before_terminate)(struct damon_ctx *context);
+	void (*before_terminate)(struct damon_ctx *context);
 };
 
 /**
diff --git a/mm/damon/dbgfs.c b/mm/damon/dbgfs.c
index befb27a29aab..eccc14b34901 100644
--- a/mm/damon/dbgfs.c
+++ b/mm/damon/dbgfs.c
@@ -645,18 +645,17 @@ static void dbgfs_fill_ctx_dir(struct dentry *dir, struct damon_ctx *ctx)
 		debugfs_create_file(file_names[i], 0600, dir, ctx, fops[i]);
 }
 
-static int dbgfs_before_terminate(struct damon_ctx *ctx)
+static void dbgfs_before_terminate(struct damon_ctx *ctx)
 {
 	struct damon_target *t, *next;
 
 	if (!targetid_is_pid(ctx))
-		return 0;
+		return;
 
 	damon_for_each_target_safe(t, next, ctx) {
 		put_pid((struct pid *)t->id);
 		damon_destroy_target(t);
 	}
-	return 0;
 }
 
 static struct damon_ctx *dbgfs_new_ctx(void)
-- 
2.32.0