From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id E463FC433F5 for ; Fri, 29 Apr 2022 16:06:46 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1378850AbiD2QKB (ORCPT ); Fri, 29 Apr 2022 12:10:01 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:44986 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1378834AbiD2QJl (ORCPT ); Fri, 29 Apr 2022 12:09:41 -0400 Received: from ams.source.kernel.org (ams.source.kernel.org [IPv6:2604:1380:4601:e00::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 86D85A27D9 for ; Fri, 29 Apr 2022 09:06:21 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ams.source.kernel.org (Postfix) with ESMTPS id 2E7E8B83642 for ; Fri, 29 Apr 2022 16:06:20 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 7AC0FC385B0; Fri, 29 Apr 2022 16:06:18 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1651248378; bh=Hcue4UkSxQRyEUzwbaytE02Er4fLlaTR3fDdxJ0RqWc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=X9FMxOBbdtErkeAclj4pzR65QPA31ltzHi4e6XJQM1s+FcZkV8NW3jZrxHT2kHkF4 lv5UHIsB+Z2ImbsF3l86/aSgp1oqfUZV43FKtLrX6hFKGqcvEbeKeazCUwW2kZ1IKK jSULCIeRy4oSW72G6pLsH8tUo0EKls6kOFv5KYp5cp0u/7ywvBllY90Xnz60L3qZnp HDDWHwiMC7WTAkIdr3X+rIv7Y0ZxKo21GeHrtCtuWW+LmijIvl7cff6mPLYYd6v8ts xDzEupUY0o8tb8JzJQ5pewg8RwoVHk3636mxTHYuJtX2PicCTnfLlLvuC4WC5W9I+o l7sWU07sJhCgg== From: sj@kernel.org To: akpm@linux-foundation.org Cc: linux-damon@amazon.com, linux-mm@kvack.org, linux-kernel@vger.kernel.org, SeongJae Park Subject: [PATCH 06/14] mm/damon/sysfs: prohibit multiple physical address space monitoring targets Date: Fri, 29 Apr 2022 16:05:58 +0000 Message-Id: <20220429160606.127307-7-sj@kernel.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20220429160606.127307-1-sj@kernel.org> References: <20220429160606.127307-1-sj@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: SeongJae Park Having multiple targets for physical address space monitoring makes no sense. This commit prohibits such a ridiculous DAMON context setup my making the DAMON context build function to check and return an error for the case. Signed-off-by: SeongJae Park --- mm/damon/sysfs.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/mm/damon/sysfs.c b/mm/damon/sysfs.c index 767ab8c33e4d..988247d35862 100644 --- a/mm/damon/sysfs.c +++ b/mm/damon/sysfs.c @@ -2124,6 +2124,10 @@ static int damon_sysfs_set_targets(struct damon_ctx *ctx, { int i, err; + /* Multiple physical address space monitoring targets makes no sense */ + if (ctx->ops.id == DAMON_OPS_PADDR && sysfs_targets->nr > 1) + return -EINVAL; + for (i = 0; i < sysfs_targets->nr; i++) { struct damon_sysfs_target *sys_target = sysfs_targets->targets_arr[i]; -- 2.25.1