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 8AD31363C53; Wed, 1 Jul 2026 14:48:28 +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=1782917310; cv=none; b=H9uUrdpsyGw9fZsvNDjlAJuFE6h+QdWQV/u5ecwWel1PjdCPYNW5y36MdQkyZtl0pKau+7e+zMVYflpXp19pTrfvQ7O3dZNWsy7SBmzdnAwXWbG2O0CibuH4i1erF7IjL2ojevlc6VAdO1CfwFeTL1uaFEfjCM1EwQlOHSarG/s= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1782917310; c=relaxed/simple; bh=GtNKjA/c2e4yX3uQ3qCAc7LQt2Zkhl6U4ONmEz+idT8=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=Sk8TVVL9PgbQ4iSJJy/Sr2UbNwKf81+2BXS0KIJJiYo1WDVG83IuswgPiVVkiAT1knOkaEOeDrlHNy+OfH4HAYM7MDETcTFl8aVNuZmFpK8cIPQ3vEmsrquFTPMEjwsELeZ0A/MoXUqpYXXZd+Z9beLXISsFEXrGJSGTO2z4ico= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=CfHMA57v; 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="CfHMA57v" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 2AAB61F00A3E; Wed, 1 Jul 2026 14:48:28 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1782917308; bh=4VafhRbm8rnHMCZpEIBC3NAXIVyFpdQKn/cpt2JTi7U=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=CfHMA57v/es7Bf6Eh48NbQYpsR1IkkJ+j14HygB2KVFBx6o7mM+KtPXG1lZWxmN/U Pf9ZN9c7Q+WV7pcelUlpmQi/cTf/Ywfou7qiOMVwvTkubK3loe8DSiSbxUkhK1X2/S ZAekMOpzQbN3Zs8yVaYlXa2rRmDhcDGtm6h3Jdr4o28FjuaM4hui82zuh4/Ku+mNxB nKiGXJCmjDdIqlxQwQW07DDL/JMlXQqhZRhgvnvxVHMABM6X4yUYUcew8/IbX8DnNn +v0pze6gHtm+vn6PgwLlhAaAs8IyeftrqVHqkg2g2ekt3IcLXmMidl2J3PMf3RO6IW D3e3G/1JnLSRQ== 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 8/8] mm/damon/sysfs: remove region size validation Date: Wed, 1 Jul 2026 07:48:10 -0700 Message-ID: <20260701144815.113325-9-sj@kernel.org> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260701144815.113325-1-sj@kernel.org> References: <20260701144815.113325-1-sj@kernel.org> Precedence: bulk X-Mailing-List: damon@lists.linux.dev 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