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 817BB378814; Thu, 2 Jul 2026 21:06:16 +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=1783026378; cv=none; b=u5RDt07qSNiBvzqutpp1gKlJ5nwKhUZ2vFB2yAQr0ci2bnOjKaoga+D99KkcU4O/iMJneDtwBf/UmmyyjY5Z7tVLlUtNEIcPYhybSvtn9NtGW+e1/gxicxyKZb5MMfyL/kruBg/aFQhKU0Oqg/dcqQ7YrybD+4esuuPYo7796vg= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1783026378; c=relaxed/simple; bh=GtNKjA/c2e4yX3uQ3qCAc7LQt2Zkhl6U4ONmEz+idT8=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=rD4waLPrp0Ke1RYHfTvZ7OYSKp7KqdgVmJpGKPq+9Lg4mbvoyGy15sc7PaqCGIC+oYZSTbtTsFrgeFSrEY29y64icEz9TYzIWpwedkgyiUI8JfTeChdhBcZkkcRpal3WZK8t1HbJQaLBHO0gL+z0+Q8n6sKiI6ze7mTTPCjTnDI= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=DSA7olTX; 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="DSA7olTX" Received: by smtp.kernel.org (Postfix) with ESMTPSA id C12941F00A3A; Thu, 2 Jul 2026 21:06:14 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1783026376; bh=4VafhRbm8rnHMCZpEIBC3NAXIVyFpdQKn/cpt2JTi7U=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=DSA7olTXiK45kxIsJ2zUsJjlHNjfe2YGVGHkKrxOn+m2Kvh7MW1DpHKwaoHSDtrZx UYfI3QmQJroc/k3L6Qz1cnKLIbCYUBtrycelGNDd4aG8liuLE4VHj3oW4/KJOarXD2 ao2+jfYyKunNNtzGA85zeoLYGPZ2TxHsnUPNoS9dCEEwn7nqnLilHyzPQwomoUjGE2 EyFbHGRbw8NrUnBIWwB286euTRDLUdSG0vYBsWTruaFyVM6/i/1MkNYt/n2NsVIQwt N/1KVzLtVQIv7i/ZqAyCxaKNxKzrj6RR7dRsAq/EcdHil4PGX1zu2tdA9X0AkX1gb7 GqhYboUbPoS3w== From: SJ Park To: Cc: SJ Park , Andrew Morton , damon@lists.linux.dev, linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: [RFC PATCH v1.1 8/8] mm/damon/sysfs: remove region size validation Date: Thu, 2 Jul 2026 14:05:50 -0700 Message-ID: <20260702210551.95167-9-sj@kernel.org> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260702210551.95167-1-sj@kernel.org> References: <20260702210551.95167-1-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: 8bit DAMON_SYSFS validates user inputs for monitoring target regions to disallow negative size regions. DAMON core assumes only positive size regions, though. The validation is incomplete. Fortunately damon_set_regions(), which is eventually used by DAMON_SYSFS, does the complete validation. Remove the incomplete and unnecessary validation. Signed-off-by: SJ Park --- mm/damon/sysfs.c | 3 --- 1 file changed, 3 deletions(-) diff --git a/mm/damon/sysfs.c b/mm/damon/sysfs.c index e666dddf1feba..b65651498e0d1 100644 --- a/mm/damon/sysfs.c +++ b/mm/damon/sysfs.c @@ -1987,9 +1987,6 @@ static int damon_sysfs_set_regions(struct damon_target *t, struct damon_sysfs_region *sys_region = sysfs_regions->regions_arr[i]; - if (sys_region->ar.start > sys_region->ar.end) - goto out; - ranges[i].start = sys_region->ar.start; ranges[i].end = sys_region->ar.end; if (i == 0) -- 2.47.3