linux-kernel - [PATCH 4/5] mm/damon/reclaim: use damon_kdamond

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Message-ID: <20260115152047.68415-5-sj@kernel.org>
Date: Thu, 15 Jan 2026 07:20:44 -0800
From: SeongJae Park <sj@...nel.org>
To: Andrew Morton <akpm@...ux-foundation.org>
Cc: SeongJae Park <sj@...nel.org>,
	damon@...ts.linux.dev,
	linux-kernel@...r.kernel.org,
	linux-mm@...ck.org
Subject: [PATCH 4/5] mm/damon/reclaim: use damon_kdamond_pid()

DAMON_RECLAIM directly uses damon_ctx->kdamond field with manual
synchronization using damon_ctx->kdamond_lock, to get the pid of the
kdamond.  Use a new dedicated function for the purpose, namely
damon_kdamond_pid(), since that doesn't require manual and error-prone
synchronization.

Signed-off-by: SeongJae Park <sj@...nel.org>
---
 mm/damon/reclaim.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/mm/damon/reclaim.c b/mm/damon/reclaim.c
index 8463a5a5032f..55df43e241c5 100644
--- a/mm/damon/reclaim.c
+++ b/mm/damon/reclaim.c
@@ -307,7 +307,9 @@ static int damon_reclaim_turn(bool on)
 	err = damon_start(&ctx, 1, true);
 	if (err)
 		return err;
-	kdamond_pid = ctx->kdamond->pid;
+	kdamond_pid = damon_kdamond_pid(ctx);
+	if (kdamond_pid < 0)
+		return kdamond_pid;
 	return damon_call(ctx, &call_control);
 }
 
-- 
2.47.3