From nobody Sat Feb 7 18:46:44 2026 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 9C7A73B8BB7; Thu, 15 Jan 2026 15:20:54 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1768490454; cv=none; b=Eib33wYwbMeUiFQMvaYgisk5ZfYuk3MD3SktGpkGfJJPbpB13HBJbcAfsx/SdKFypJ+92lEnLlzVyuc08Fl0Wt+Pk+VtGW8fp2wDMs9UNzg8GpC9eRT3DibuzRDBI7MUNItPQ0x7OJPv48Hx+SphxfIsrwV3kDktq5piRikKRN4= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1768490454; c=relaxed/simple; bh=Ta8voQ7PwaIwWi/tca9PDpVSIdwL9VUNWSGlUVLCyN8=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=NACNy2n0oIs9NsvIFdSZ5QNUWA9r1ge4vurzwALPK5urdf4TthoWUcu2jvRwIK0w+vjahv9QwyPV5AZXvHRO/z7z0RO3gddRXMS9HNhVjLHap3A7tEhMZnesNiCSDELBQSbdGhfCgBtZddYX23nO3ivkZta95+V2yVUNwNjNwik= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=auUbi4LZ; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="auUbi4LZ" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 92DBCC16AAE; Thu, 15 Jan 2026 15:20:53 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1768490453; bh=Ta8voQ7PwaIwWi/tca9PDpVSIdwL9VUNWSGlUVLCyN8=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=auUbi4LZbcZY3XoZTmiuEBz9GFhg0i5IAadPhW3u5NPpvll+nU3nybYQhPjICRqrz vIEAcLAnh+2xP+WIYwOc9F9r9eWVTY0Q6hZiR7MCIk9KyFf0AAX5/BmP4OihheV/Ge JOWuHkr0tr8+AFb0hZYuKrBdyRiaSeR8HCrC9QJZQDDu7kK97Xe2cFgDe/bLc9AllJ eqsZvxCYVxF8yaeHoF9eWXr6JotDIzOVgpoZSJOZq1gQdX5SmSVgWBFgHAGYDTbGoB ksMlUXisqACVLlpzTEjbBMoZtFZIiTus8BEpVaCuBCeX1Qq6zyMkAkt+aJTovh2tXj vVywYGXmuu72w== From: SeongJae Park To: Andrew Morton Cc: SeongJae Park , damon@lists.linux.dev, linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: [PATCH 4/5] mm/damon/reclaim: use damon_kdamond_pid() Date: Thu, 15 Jan 2026 07:20:44 -0800 Message-ID: <20260115152047.68415-5-sj@kernel.org> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260115152047.68415-1-sj@kernel.org> References: <20260115152047.68415-1-sj@kernel.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" 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 --- 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 =3D damon_start(&ctx, 1, true); if (err) return err; - kdamond_pid =3D ctx->kdamond->pid; + kdamond_pid =3D damon_kdamond_pid(ctx); + if (kdamond_pid < 0) + return kdamond_pid; return damon_call(ctx, &call_control); } =20 --=20 2.47.3