From nobody Thu Apr 9 20:09:14 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 CAFAC3D3499; Fri, 6 Mar 2026 15:29:22 +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=1772810962; cv=none; b=f+41mCjhByMXqDt4xVxNMQ1Bi9WC+M8FqX0pjPQ1VSKMXaLvwSx9QCtR2PINdG6innho6PUiYlJOpASbD34FTBFOzKlQLNabnQl7Of8q3pvdJa2TpALw2DDW5udfMdjmjn8ytFJ8VkYN/8+iWkSfX9ImJBWFe+vR0nXVxO7v820= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1772810962; c=relaxed/simple; bh=h0Fe5csr3sldzD6TLO83VPiRoEMNSXNoD5pNU6aZzIs=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=BtMbywfjXYn4ftGXNQrgZHRBKkUE1gylBpq0ds0Sz0IYDhMGiQ/hKB5YwqbxxRi09zRJSNEdUaUHH6oIzkczeuqMbeVifH29QVpYogEfdEf7WKRfDdMz2rv2h+NZoA2xMAQ22GPHrGOZYgQrzTfz2xFCLQqCRfFBv4dst/1K/ts= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=i10Odjcx; 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="i10Odjcx" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 8CA3CC4CEF7; Fri, 6 Mar 2026 15:29:22 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1772810962; bh=h0Fe5csr3sldzD6TLO83VPiRoEMNSXNoD5pNU6aZzIs=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=i10OdjcxbIIELF+N6tlSux0gYDg0CoQs9zRPvDBH7PxK3Pv5+MaS73hoMBgMR6UVj UlbnKTr0kP2i7z+BwDMbJpSrnxIeK1Ddrk2QqZ97vlQw3ARgIgTDRGPRkHrHF5jTww 238+MOrpYZDHA80e9LktKDClyiA2A8n8LqVsQbm2vGiINhRlNrDokGl1lm3HYB7kn0 /cPj6g8pP26AyT+oOeAbw3OEb7FYJinyuDeGNEL1C7atJrjXJIZODMLX0Tp1FCVbLe O4M56BR5HSjEnN12cWsdGEPnVTvDYlUZ30tjs3k0NHFZ8ridz1L/GkgBr7X5cX4BQR WFvLOvKYldZag== From: SeongJae Park To: Andrew Morton Cc: SeongJae Park , damon@lists.linux.dev, linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: [PATCH 03/10] mm/damon/core: add damon_del_region() debug_sanity check Date: Fri, 6 Mar 2026 07:29:06 -0800 Message-ID: <20260306152914.86303-4-sj@kernel.org> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260306152914.86303-1-sj@kernel.org> References: <20260306152914.86303-1-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_del_region() should be called for targets that have one or more regions. Add a sanity check for that under CONFIG_DAMON_DEBUG_SANITY. Signed-off-by: SeongJae Park --- mm/damon/core.c | 13 +++++++++++++ 1 file changed, 13 insertions(+) diff --git a/mm/damon/core.c b/mm/damon/core.c index 0c1353164ec81..92eac5eb96026 100644 --- a/mm/damon/core.c +++ b/mm/damon/core.c @@ -152,8 +152,21 @@ void damon_add_region(struct damon_region *r, struct d= amon_target *t) t->nr_regions++; } =20 +#ifdef CONFIG_DAMON_DEBUG_SANITY +static void damon_verify_del_region(struct damon_target *t) +{ + WARN_ONCE(t->nr_regions =3D=3D 0, "t->nr_regions =3D=3D 0\n"); +} +#else +static void damon_verify_del_region(struct damon_target *t) +{ +} +#endif + static void damon_del_region(struct damon_region *r, struct damon_target *= t) { + damon_verify_del_region(t); + list_del(&r->list); t->nr_regions--; } --=20 2.47.3