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 00676360ED6; 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=1782917309; cv=none; b=fddBgSY/wUUu69x9Sr5XSxEIDx0qjg8UUqClcDCCNEZSo3ASHhW/UFygAGykNj3nmG9L5kBhcd7io9X+RxNceA+5TwlU6yFNCLLXwfrqSHfZXnyV+81Z0jXRf0um3n7xAxFoPIEs7zZzCcZlSleAmLc2Gpn+8Q594gszTGsj91M= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1782917309; c=relaxed/simple; bh=bdekqXvOVoaDs3Ln06eDJGdKKSdYIc1OYGapj3qJYd0=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=jOdx9zc7Ic+h/b9o1rLjxx3n7y1QulXcHOMMgD5VVpcV6t7+oiQJPZco8/1BAh16xF8zhCS4bG4BYh/yAtzdR6lzzjfk6hbsza+WWoxM1LOjV1sDCmgDnlGB3t4IMJid1cwGHuoOwyHHaak2WF0H8MgBsZVoNXdAgwetnoTFQCk= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=Ef1kytGx; 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="Ef1kytGx" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 991B21F00A3D; Wed, 1 Jul 2026 14:48:27 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1782917307; bh=5cBYap3I/+j4x4ct/1Qkcg1MmF7CxIgWC1JLwxymeuc=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=Ef1kytGxIlm9+IeZ3gf6w0dQ6AIqWkP5gaPwK+NBTWchJf9jk80+9vPq2C8lxdtLO SC/NZ/iuMhPJieCxVpZnTGcSgbuBPIRZZ5r7sUcnrK5jeC5dhtpUZn3lPR6GfQJMQI /Rj9OJ0cIW8oEQ0KB164m40hrCmKWgksmERooV3l58FtacpjrG02qHsdjBj4qMlAiy 6jLgahisGpdMtsxE4yzxoElgB/5Qz8MFOg82CN9hST/szLnbxCTRZ1TP8upM7G26ee vHXvA03bBRT0B7wG/OXjWDah6xTDBG0nc7WLiTlUGwmATujBpOdfQ3yoVbzcgCHlDQ EFkpz6GhYLK0Q== 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 7/8] mm/damon/core: remove start, end check in damon_set_region_system_rams() Date: Wed, 1 Jul 2026 07:48:09 -0700 Message-ID: <20260701144815.113325-8-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_set_region_system_rams() validates user inputs to avoid creating a negative size region. But DAMON core avoids zero size, too. The check is incomplete. The complete check is done inside damon_set_regions(), which is eventually called from damon_set_region_system_rams_default(). Drop the incomplete and unnecessary check. Signed-off-by: SJ Park --- mm/damon/core.c | 3 --- 1 file changed, 3 deletions(-) diff --git a/mm/damon/core.c b/mm/damon/core.c index 6b30cb6007e54..3caf1b67a7f98 100644 --- a/mm/damon/core.c +++ b/mm/damon/core.c @@ -3847,9 +3847,6 @@ int damon_set_region_system_rams_default(struct damon_target *t, { struct damon_addr_range addr_range; - if (*start > *end) - return -EINVAL; - if (!*start && !*end && !damon_find_system_rams_range(start, end, addr_unit)) return -EINVAL; -- 2.47.3