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 B85DD3803C7; Thu, 2 Jul 2026 21:06:14 +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=1783026375; cv=none; b=Gb17xM5q+0rAB8+vXtceHD7Dgo0sQvIwgf7hNUBCVrOSbN1TFeOw064auYU8p24g/r/j5BYPS04MInYtg48echbkfaiVuDkmr/1kPTVH1/dpsPsB4U6y1Rgxlx7dR8Bkz90S3IXBBLiRuEHPYrHb4bXzUrzkwdBAFJEz05AFXV8= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1783026375; c=relaxed/simple; bh=goEuQ34q9K5GCZvxlQ4oxqPzSXhD969gZ0WIrYhCgNM=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=Q52wqLY3cgmt3Srw+u8Sq4cuKvPYRU7AWBAdA3zJn7bn0L5S/9BmrdJnnP3GpZb/ZT+2AZu7PnMANT9YlMGzr0wz+ulT+lqAZTnzPfOYo8qGNeDuWqjRzFCDAUgynr02Pnyc+euEDBprrrZokSehDG+78BM4Nii9xb77FKvANJ4= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=XjJmr1gQ; 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="XjJmr1gQ" Received: by smtp.kernel.org (Postfix) with ESMTPSA id E1F951F00A3E; Thu, 2 Jul 2026 21:06:13 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1783026374; bh=3BUtL0wdhRHBCOaPZNQsX8fjUI9m5nC+jbrg8ueFSt4=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=XjJmr1gQ51HXvJVpcXxk/bKSPfbeoxDgQExOGa2UWh8rMvyKzhr1k4+rn794A4jD1 Uncize0oEBLHFHMtajttgUcGKDfZPq128HITOPFHWlO2nezZAyDKmIc5NZgF1QVIJ/ +g1Ixii4KVAr1aCJhWnW1P1tQbB0WJJc+6yYap7s9rWM1FyXTSt9K1lNDPXbC+OaeM IABNn7MGGQVgVm1hJbOwakWUajkzQS3e4YECRdaeh+4izzNvjFT8sDJ/QwayXDNe7Y d6aMfWSqftpt+BRoHY+bHJZ4Ic1PXEo8mYk7aBYTCK/5lQdp8dRiEaiGc+kj3OPcwE +WYi6Ms0NAj0g== 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 7/8] mm/damon/core: remove start, end check in damon_set_region_system_rams() Date: Thu, 2 Jul 2026 14:05:49 -0700 Message-ID: <20260702210551.95167-8-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_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 ca301abcb9ec5..3c5a46e1c079a 100644 --- a/mm/damon/core.c +++ b/mm/damon/core.c @@ -3846,9 +3846,6 @@ 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