[merged mm-stable] mm-damon-sysfs-propagate-damon_call-error-in-turn_damon_on.patch removed from -mm tree

[merged mm-stable] mm-damon-sysfs-propagate-damon_call-error-in-turn_damon_on.patch removed from -mm tree

[Andrew Morton]

The quilt patch titled
     Subject: mm/damon/sysfs: propagate damon_call() error in turn_damon_on
has been removed from the -mm tree.  Its filename was
     mm-damon-sysfs-propagate-damon_call-error-in-turn_damon_on.patch

This patch was dropped because it was merged into the mm-stable branch
of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

------------------------------------------------------
From: Xuewen Wang <wangxuewen@kylinos.cn>
Subject: mm/damon/sysfs: propagate damon_call() error in turn_damon_on
Date: Mon, 21 Sep 2026 08:15:44 -0700

damon_sysfs_turn_damon_on() ignored the return value of damon_call() for
the repeat call control registration and always returned the stale result
of damon_start() (0 at that point).  When damon_call() fails, e.g., the
kdamond is already exiting, the user still gets success from the state
file write while monitoring is not actually on.

Save and return the damon_call() result instead.  No rollback of
damon_start() is needed since a failed damon_call() guarantees the context
is stopped.

Link: https://lore.kernel.org/20260921151547.78472-3-sj@kernel.org
Signed-off-by: Xuewen Wang <wangxuewen@kylinos.cn>
Signed-off-by: SJ Park <sj@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Reviewed-by: SJ Park <sj@kernel.org>
Cc: Adrian Huang <adrianhuang0701@gmail.com>
Cc: Karthikeyan KS <karthiproffesional@gmail.com>
Cc: Liew Rui Yan <aethernet65535@gmail.com>
Cc: Zenghui Yu (Huawei) <zenghui.yu@linux.dev>
---

 mm/damon/sysfs.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/mm/damon/sysfs.c~mm-damon-sysfs-propagate-damon_call-error-in-turn_damon_on
+++ a/mm/damon/sysfs.c
@@ -2607,7 +2607,8 @@ static int damon_sysfs_turn_damon_on(str
 	repeat_call_control->data = kdamond;
 	repeat_call_control->repeat = true;
 	repeat_call_control->dealloc_on_cancel = true;
-	if (damon_call(ctx, repeat_call_control))
+	err = damon_call(ctx, repeat_call_control);
+	if (err)
 		kfree(repeat_call_control);
 	return err;
 }
_

Patches currently in -mm which might be from wangxuewen@kylinos.cn are