linux-kernel - [RFC PATCH 11/14] mm/damon/sysfs: remove damon_sysfs_destroy

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Message-Id: <20250706200018.42704-12-sj@kernel.org>
Date: Sun,  6 Jul 2025 13:00:15 -0700
From: SeongJae Park <sj@...nel.org>
To: 
Cc: SeongJae Park <sj@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	damon@...ts.linux.dev,
	kernel-team@...a.com,
	linux-kernel@...r.kernel.org,
	linux-mm@...ck.org
Subject: [RFC PATCH 11/14] mm/damon/sysfs: remove damon_sysfs_destroy_targets()

The function was introduced for putting pids and deallocating
unnecessary targets.  Hence it is called before damon_destroy_ctx().
Now vaddr puts pid for each target destruction (cleanup_target()).
damon_destroy_ctx() deallocates the targets anyway.  So
damon_sysfs_destroy_targets() has no reason to exist.  Remove it.

Signed-off-by: SeongJae Park <sj@...nel.org>
---
 mm/damon/sysfs.c | 23 +++--------------------
 1 file changed, 3 insertions(+), 20 deletions(-)

diff --git a/mm/damon/sysfs.c b/mm/damon/sysfs.c
index 5eba6ac53939..b0f7c60d655a 100644
--- a/mm/damon/sysfs.c
+++ b/mm/damon/sysfs.c
@@ -1295,14 +1295,6 @@ static int damon_sysfs_set_attrs(struct damon_ctx *ctx,
 	return damon_set_attrs(ctx, &attrs);
 }
 
-static void damon_sysfs_destroy_targets(struct damon_ctx *ctx)
-{
-	struct damon_target *t, *next;
-
-	damon_for_each_target_safe(t, next, ctx)
-		damon_destroy_target(t, ctx);
-}
-
 static int damon_sysfs_set_regions(struct damon_target *t,
 		struct damon_sysfs_regions *sysfs_regions)
 {
@@ -1337,7 +1329,6 @@ static int damon_sysfs_add_target(struct damon_sysfs_target *sys_target,
 		struct damon_ctx *ctx)
 {
 	struct damon_target *t = damon_new_target();
-	int err = -EINVAL;
 
 	if (!t)
 		return -ENOMEM;
@@ -1345,16 +1336,10 @@ static int damon_sysfs_add_target(struct damon_sysfs_target *sys_target,
 	if (damon_target_has_pid(ctx)) {
 		t->pid = find_get_pid(sys_target->pid);
 		if (!t->pid)
-			goto destroy_targets_out;
+			/* caller will destroy targets */
+			return -EINVAL;
 	}
-	err = damon_sysfs_set_regions(t, sys_target->regions);
-	if (err)
-		goto destroy_targets_out;
-	return 0;
-
-destroy_targets_out:
-	damon_sysfs_destroy_targets(ctx);
-	return err;
+	return damon_sysfs_set_regions(t, sys_target->regions);
 }
 
 static int damon_sysfs_add_targets(struct damon_ctx *ctx,
@@ -1458,13 +1443,11 @@ static int damon_sysfs_commit_input(void *data)
 	test_ctx = damon_new_ctx();
 	err = damon_commit_ctx(test_ctx, param_ctx);
 	if (err) {
-		damon_sysfs_destroy_targets(test_ctx);
 		damon_destroy_ctx(test_ctx);
 		goto out;
 	}
 	err = damon_commit_ctx(kdamond->damon_ctx, param_ctx);
 out:
-	damon_sysfs_destroy_targets(param_ctx);
 	damon_destroy_ctx(param_ctx);
 	return err;
 }
-- 
2.39.5