linux-kernel - [RFC PATCH 3/7] mm/damon/reclaim: use damon

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Message-Id: <20250912023946.62337-4-sj@kernel.org>
Date: Thu, 11 Sep 2025 19:39:42 -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 3/7] mm/damon/reclaim: use damon_initialized()

DAMON_RECLAIM is assuming DAMON is ready to use in module_init time, and
uses its own hack to see if it is the time.  Use damon_initialized(),
which is a way for seeing if DAMON is ready to be used that is more
reliable and better to maintain instead of the hack.

Signed-off-by: SeongJae Park <sj@...nel.org>
---
 mm/damon/reclaim.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/mm/damon/reclaim.c b/mm/damon/reclaim.c
index 590f9d6c55ef..7ba3d0f9a19a 100644
--- a/mm/damon/reclaim.c
+++ b/mm/damon/reclaim.c
@@ -349,7 +349,7 @@ static int damon_reclaim_enabled_store(const char *val,
 		return 0;
 
 	/* Called before init function.  The function will handle this. */
-	if (!ctx)
+	if (!damon_initialized())
 		goto set_param_out;
 
 	err = damon_reclaim_turn(enable);
@@ -372,8 +372,13 @@ MODULE_PARM_DESC(enabled,
 
 static int __init damon_reclaim_init(void)
 {
-	int err = damon_modules_new_paddr_ctx_target(&ctx, &target);
+	int err;
 
+	if (!damon_initialized()) {
+		err = -ENOMEM;
+		goto out;
+	}
+	err = damon_modules_new_paddr_ctx_target(&ctx, &target);
 	if (err)
 		goto out;
 
-- 
2.39.5