From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (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 5C8F33B7B7D; Mon, 22 Jun 2026 14:10:41 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1782137442; cv=none; b=aGarQAdn8WV21YJT+8PdT49mZ86AGnCOoW6XOiSXNEl26hk3lk1c6UMiBNStggBsexgsDptybpyQ2FUSyJ7V+FozvuHgxeio/ieGuThGdWgeqtL8fVaqHQ5Wb4fhBET+AJx6Um3npjnwrBy7UDfcQeIFbdglHg/xe4EyhgxSv2I= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1782137442; c=relaxed/simple; bh=OOUNiPc0YFi3U6tqHjBq24RtvvXF3rGtt39m2q5mqRg=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=bSI5aPF3snRPSKbjhT4Fo/Olgwg9edzte2tzUYQQ3hOriGSCgsDkm8hOEKwctA5d7wn0KMV1F0v2/glGnRRJ0hPqvXTNW/ZjmxBe71GljqQv/i8yTTv68NNvSCqqlBXudLOOwcJka9YnL2JNI7/FDh4ps8C5kch5KBpcehBIFr0= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=gcv08X6g; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="gcv08X6g" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 6F7891F000E9; Mon, 22 Jun 2026 14:10:39 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1782137441; bh=J9rAqV+BtrJJS3bA6hXAT31xn9dA5LK7yhOjyVOIFTU=; h=From:To:Cc:Subject:Date; b=gcv08X6g+i3LbrmFn2qQmBt8NVRzGcb4Q8CY7KbQ/jd26MwiQqtKCDJ/rcrAupG35 Qq6NQ33NLOmy/DVUyS4OXRoHQweV8dgowskar4kXyD4fWUgO3rdjPqw8CaqM5SVsSo YCq3PHQFmNpv40lgnjtlGKkUgKp6V8ltuADGJEg3r8XERIm1snV0mzCmq63/PW4/eL hrenBujrrOs/KW5WQSSBQlPXPccbyVaW2vtpKSe2bMxLdw8sHSND3ZNlbexQVOC2Pc s+8ys4Qd9W/7bVWJBmjWVhG7GfLFDljJZczYkahTJQLpUv4ku/Xbs/wIBssdVu/skW 3IvOnE+NNA8mw== From: SeongJae Park To: Cc: SeongJae Park , "# 5 . 16 . x" , Andrew Morton , damon@lists.linux.dev, linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: [RFC PATCH v1.2 0/2] mm/damon: handle zero {sample,aggr} intervals for DAMOS quota score Date: Mon, 22 Jun 2026 07:10:23 -0700 Message-ID: <20260622141027.29145-1-sj@kernel.org> X-Mailer: git-send-email 2.47.3 Precedence: bulk X-Mailing-List: damon@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit When the intervals are zero, divide-by-zero can happen during DAMOS quota score calculation. Fixing it alone enables out-of-bound array access. Fix those. Changes from v1 - v1: https://lore.kernel.org/20260621154808.86431-1-sj@kernel.org - Add out-of-bound array access bug fix as patch 2. - Add the RFC tag again. Changes from RFC v1.1 - RFC v1.1: https://lore.kernel.org/20260620171413.89555-1-sj@kernel.org - Wordsmith commit message. - Drop RFC tag. Changes from RFC v1 - RFC v1: https://lore.kernel.org/20260619205144.150664-1-sj@kernel.org - Handle zero aggr_interval case. SeongJae Park (2): mm/damon/core: handle zero intervals in damon_max_nr_accesses() mm/damon/ops-common: prevent >DAMON_MAX_SUBSCORE freq_subscore include/linux/damon.h | 8 ++++++-- mm/damon/ops-common.c | 3 +++ 2 files changed, 9 insertions(+), 2 deletions(-) base-commit: 42306d32afd75f28e3f13a1259c3b52191b4ff2c -- 2.47.3