From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 613FD27603A; Sun, 29 Mar 2026 15:30:56 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1774798256; cv=none; b=OJ4LzOcM9qOzhriQIi/gMKMNfSTKfOLVNM+y+IsL+e7EbvVrET4NgLON4El9LZ+S5En2RO0/tjrqMGG+nt7adLt+gZM9eOtkckCg9rZf1gKWyfgJjD9AE+HHINBlev4ErkFDXjSm/dhhKevdXK2OCvXYXmbrKOQxzJwCmtSzuUI= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1774798256; c=relaxed/simple; bh=F6rB/oSgunb1Uwn0bqw0CxoNAheCQwZDVnE4QMMy5W4=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=G8vpR+3I2P5Febfl4DpQpZJqQnxDDwpwAntsLllOVwdE1J6rEvLCCNU5EASmGbqnLWhRsYKlBNdg+Yus111AWW+1s1O87lip9nk3i+ypXFQyysCFdokSKvA/ZAVNK5aBTrtX3ya0jGHz8mnRc7H1AZ07uf5PAbKm94LL5nwmgTg= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=OoMqxdD4; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="OoMqxdD4" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 63C75C116C6; Sun, 29 Mar 2026 15:30:55 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1774798255; bh=F6rB/oSgunb1Uwn0bqw0CxoNAheCQwZDVnE4QMMy5W4=; h=From:To:Cc:Subject:Date:From; b=OoMqxdD4hnvNwAN+Z47Q+bFg6GC+0rO7D2sCDao2j87/P9P9HIT8Xb+pU77OCu0vj fmCTFc+aUORYySWRafg1YanIftfU8HBzPHj8qbqLey9pxOwZ9SfwRK2asFD77QkKH6 8k+trMTJ2fzffR/wVXifCFEmhdTRVp632zkjIhWnGPxdeKhvclme8rh5r2heIDgwYU WOIEYdFHamiO+hHwSrIvO4lxvjHCt/7rvTCfWTjoXqXbxynbSDEZcGOSR8yKFolm+d ipg27t8KFMeK1IrDwZRFnPmgty/0vooOe9/zehTZPvuJRInBM4hFa9huywxLTJ3Gs1 a7L/d1HmF62BQ== From: SeongJae Park To: Andrew Morton Cc: SeongJae Park , "Liam R. Howlett" , "# 5 . 19 . x" , David Hildenbrand , Jonathan Corbet , Lorenzo Stoakes , Michal Hocko , Mike Rapoport , Shuah Khan , Suren Baghdasaryan , Vlastimil Babka , damon@lists.linux.dev, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: [PATCH 0/2] Docs/admin-guide/mm/damon: warn commit_inputs vs other params race Date: Sun, 29 Mar 2026 08:30:48 -0700 Message-ID: <20260329153052.46657-1-sj@kernel.org> X-Mailer: git-send-email 2.47.3 Precedence: bulk X-Mailing-List: linux-doc@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Writing 'Y' to the commit_inputs parameter of DAMON_RECLAIM and DAMON_LRU_SORT, and writing other parameters before the commit_inputs request is completely processed can cause race conditions. While the consequence can be bad, the documentation is not clearly describing that. Add clear warnings. The issue was discovered [1,2] by sashiko. [1] https://lore.kernel.org/20260319161620.189392-3-objecting@objecting.org [2] https://lore.kernel.org/20260319161620.189392-2-objecting@objecting.org Changes from RFC (https://lore.kernel.org/20260328172415.49940-1-sj@kernel.org) - Wordsmith. - Rebase to latest mm-new. SeongJae Park (2): Docs/admin-guide/mm/damon/reclaim: warn commit_inputs vs param updates race Docs/admin-guide/mm/damon/lru_sort: warn commit_inputs vs param updates race Documentation/admin-guide/mm/damon/lru_sort.rst | 4 ++++ Documentation/admin-guide/mm/damon/reclaim.rst | 4 ++++ 2 files changed, 8 insertions(+) base-commit: b761d53965a239abe1469f2e4e2d4f7d69fac9bd -- 2.47.3