From: SeongJae Park <sj@kernel.org>
Date: Tue, 16 Sep 2025 03:15:49 +0000 (-0700)
Subject: mm/damon/lru_sort: use param_ctx for damon_attrs staging
X-Git-Tag: v6.12.54~70
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=d9c7886b84b303a893dd7b43ee871f5b1a653b2b;p=thirdparty%2Fkernel%2Fstable.git

mm/damon/lru_sort: use param_ctx for damon_attrs staging

commit e18190b7e97e9db6546390e6e0ceddae606892b2 upstream.

damon_lru_sort_apply_parameters() allocates a new DAMON context, stages
user-specified DAMON parameters on it, and commits to running DAMON
context at once, using damon_commit_ctx().  The code is, however, directly
updating the monitoring attributes of the running context.  And the
attributes are over-written by later damon_commit_ctx() call.  This means
that the monitoring attributes parameters are not really working.  Fix the
wrong use of the parameter context.

Link: https://lkml.kernel.org/r/20250916031549.115326-1-sj@kernel.org
Fixes: a30969436428 ("mm/damon/lru_sort: use damon_commit_ctx()")
Signed-off-by: SeongJae Park <sj@kernel.org>
Reviewed-by: Joshua Hahn <joshua.hahnjy@gmail.com>
Cc: Joshua Hahn <joshua.hahnjy@gmail.com>
Cc: <stable@vger.kernel.org>	[6.11+]
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/mm/damon/lru_sort.c b/mm/damon/lru_sort.c
index c2b4f0b071472..5654e31a198a4 100644
--- a/mm/damon/lru_sort.c
+++ b/mm/damon/lru_sort.c
@@ -203,7 +203,7 @@ static int damon_lru_sort_apply_parameters(void)
 		goto out;
 	}
 
-	err = damon_set_attrs(ctx, &damon_lru_sort_mon_attrs);
+	err = damon_set_attrs(param_ctx, &damon_lru_sort_mon_attrs);
 	if (err)
 		goto out;