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imf07.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20260515 header.b=bG91hedU; spf=pass (imf07.hostedemail.com: domain of sj@kernel.org designates 172.105.4.254 as permitted sender) smtp.mailfrom=sj@kernel.org; dmarc=pass (policy=quarantine) header.from=kernel.org ARC-Seal: i=1; a=rsa-sha256; d=hostedemail.com; s=arc-20220608; cv=none; t=1785687657; b=IuikEDzvIBVhKQcpC3MoTiI/JybR0LUqQF1LrNVIa5xddLbAzL2wTtzXBe9vt3FWPa1AHN CZySITin760RgGTqEs5cD55f+zxpc1pSqxFZoRQ77P/dInQ56DU4PXgpgvTT4nh3Acttz4 dnvDla57u5FfjHrbB9RYLeh3sxf6dfw= Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) by tor.source.kernel.org (Postfix) with ESMTP id 74BDE60AA3; Sun, 2 Aug 2026 16:20:56 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id E741A1F000E9; Sun, 2 Aug 2026 16:20:55 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1785687656; bh=EeL7EexGcxVGO5VVZMxodiz3XY6WPJZIVBQfHZICIwc=; h=From:To:Cc:Subject:Date; b=bG91hedURWN2K+cf8RTj9098FPlOiDM3pFA4pF4o9OqjQSzKnJlqpUec9dClXUI7f vz/pbyNwzPuxDMrXz6BWtN/Bt7H6T3z8TITa3iCpAIrzA/yGjfjxHzt4U/etzF+j82 8MfyAQ7GROCmZL4KUXISbFvR+4Me9ctLRpYkhRQ8Vvs9T/Nxn1ZgjjdhsOv652G3iI y6gX3Yk1RiI2nzNm+hbakReUPqNT4DBj34Mozabv5WaTj676sIYbDOQJ9A14mCYbnk AE/WG2rjb+Z3e1xgnHKQ0oEQFs02lPT51cmUV3MQfMrNdtnbr5M/2A+idcDFUt/X+J N6JmLNZpHoTgA== From: SJ Park To: Cc: SJ Park , stable@vger.kernel.org, Andrew Morton , Yunjeong Mun , damon@lists.linux.dev, linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: [RFC PATCH v2 0/2] mm/damon: avoid division by zero from damos_quota_score() Date: Sun, 2 Aug 2026 09:20:47 -0700 Message-ID: <20260802162050.89477-1-sj@kernel.org> X-Mailer: git-send-email 2.47.3 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspamd-Queue-Id: D4FD640008 X-Rspam-User: X-Stat-Signature: d479eud3ah1pj9nh4zfj9na77gkmuoww X-Rspamd-Server: rspam04 X-HE-Tag: 1785687657-14134 X-HE-Meta: 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 ICsOoseW EvnUITPrVPsa9QFjRwOHt3vrlNQILxHYkNuiIbfPh5mPok63IvqVcmFDlxOEOuh2CkK7OE5IWFOcj8WiAetjmbwq0qfYpZOeN3WCQbErBfFArse18hOn8ccQ9smwKMvaxJQpxu889JAsIAWEkMCMx63niighaJa8mFP2QXSo4J3pVovJNPBCC8j03u9P9PPaYMzTfQFPsYppQ0p3ASzK3ljF8p65XYSLTE0djAo7HoQt+4WLYe5VI2gf2RMIl0Z0PRjXXNQyv2ErAI6KkR1+knuKW/ZC5AfaJC2dgzP8/a4pXXLs= Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: DAMON_SAMPLE_MTIER and DAMON_LRU_SORT allow the user to trigger division by zero in damos_quota_score(). Avoid it by adding parameters validation checks. Changes from RFC - RFC: https://lore.kernel.org/20260801211315.2456-1-sj@kernel.org - Add a fix for DAMON_LRU_SORT. SJ Park (2): samples/damon/mtier: error out for zero quota goal target values mm/damon/lru_sort: error out for >10000 active_mem_bp mm/damon/lru_sort.c | 2 ++ samples/damon/mtier.c | 3 +++ 2 files changed, 5 insertions(+) base-commit: 51d61cb34d137b13957ce83455c1f596d39e8cfe -- 2.47.3