From nobody Sat Apr 11 10:46:30 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 B49C43D1CB2; Fri, 6 Mar 2026 15:29:23 +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=1772810963; cv=none; b=dO1UFlyI7NGmgrEv33OJPR7i8x5HC6aaF9/13yg55K/sjps1MAyVcVj3/nnuDjWWRA1iKKtD1Zu2Lt1VkKMPF0F3ppEWJMBe9DMcGVOzIvE9BrV48eCjFanDdUwWR6kAp1CQHyYRijMzgoAaCL7Ey1fUip0jhm8Qd0sx+FyjdOg= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1772810963; c=relaxed/simple; bh=DbZTn4AVN3XfN74TG8oRW8P+LKBDP3hbPLRg+ZDBhJg=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=RQfbP0y9mCChf1PUPRQF3toTjGX8psP9vKBWBvxWgdTyjV9z4omT2q4tdfzKtot9DCakZwy/P/Eg050bZ+7Y/1fkP2DjKPv8Dr+4fuNHVsXLqC6Y2gnOip0D9Zsw6xmV2wPjyytfjiIBXDLgPje25fCyh5wtSa7f4YNuh3b6+qA= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=i9X92hQs; 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="i9X92hQs" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 771F7C2BCB0; Fri, 6 Mar 2026 15:29:23 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1772810963; bh=DbZTn4AVN3XfN74TG8oRW8P+LKBDP3hbPLRg+ZDBhJg=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=i9X92hQsj5ctbO2KCOOvIWvY64DUXlPEAbUFN1LaUjDwBtNz9naa62II0rGXIRJ+Q 6Ys9FlwbtiUTT/NSoXJcwPUl6bTCQqTmIN+ALXeeuWiBpz5UZoFmV3KHifGtvqNKgA JihBLT8MavLFZaNFjR+XhDC5t4MP9lHi7X1AKWlEM1qVs6SArV8CbxOm/Z2p/QBsPk ffCZGw1IGFtJFF7FW5XuFhTprMQkapZAxJYmDENKtq8a9IkeA2MIOc+LXmd1Oub1hk K4SKuF4S9sSP+caqgo6/U+F2FuD9iuMJWl/4VpIS36Fyur59NAcNPHtSFVgRji30fC id9RP/X8fmKfA== From: SeongJae Park To: Andrew Morton Cc: SeongJae Park , damon@lists.linux.dev, linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: [PATCH 07/10] mm/damon/core: add damon_split_region_at() debug_sanity check Date: Fri, 6 Mar 2026 07:29:10 -0800 Message-ID: <20260306152914.86303-8-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_split_region_at() should be called with the correct address to split on. Add a sanity check for that under CONFIG_DAMON_DEBUG_SANITY. Signed-off-by: SeongJae Park --- mm/damon/core.c | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) diff --git a/mm/damon/core.c b/mm/damon/core.c index 93d1577b1ae07..be2300cf3aeae 100644 --- a/mm/damon/core.c +++ b/mm/damon/core.c @@ -2586,6 +2586,21 @@ static void kdamond_merge_regions(struct damon_ctx *= c, unsigned int threshold, threshold / 2 < max_thres); } =20 +#ifdef CONFIG_DAMON_DEBUG_SANITY +static void damon_verify_split_region_at(struct damon_region *r, + unsigned long sz_r) +{ + WARN_ONCE(sz_r =3D=3D 0 || sz_r >=3D damon_sz_region(r), + "sz_r: %lu r: %lu-%lu (%lu)\n", + sz_r, r->ar.start, r->ar.end, damon_sz_region(r)); +} +#else +static void damon_verify_split_region_at(struct damon_region *r, + unsigned long sz_r) +{ +} +#endif + /* * Split a region in two * @@ -2597,6 +2612,7 @@ static void damon_split_region_at(struct damon_target= *t, { struct damon_region *new; =20 + damon_verify_split_region_at(r, sz_r); new =3D damon_new_region(r->ar.start + sz_r, r->ar.end); if (!new) return; --=20 2.47.3