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a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1774907202; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=OQ68BezDSy6uMOJzbqpvhdM82vUnSRCqZpxt+vfHYzY=; b=Ig3vHxTx5zuObw5HxYHAjL/KzgfV5lNHOTW9t8p9fscaTvMLfBYuz7TixROf6sKDavmZL9 ESbDZQdQTFPn0J/txDDLj7WCzNQjvumvQ53UOemw3rDJi7YUDLvewYH83seDDsFv7h9rJ9 KEmIjiSoBHZmhYi7sfbOZeTGGOkYmdM= Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by sea.source.kernel.org (Postfix) with ESMTP id A45F14426C; Mon, 30 Mar 2026 21:46:41 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 3CEF4C4CEF7; Mon, 30 Mar 2026 21:46:41 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linux-foundation.org; s=korg; t=1774907201; bh=p0Ky5bZRAoBg1rNqNR7UMmanDEON+/dh3M7UQ6lJ7YM=; h=Date:From:To:Cc:Subject:In-Reply-To:References:From; b=kuGpwU1lV3znQxQPn/hdTO0gUyfcsyLhmSKR+/kzzTKoUGn5AW51PjO513mXxYT/K 9lK9RDyMmonCpXhvg1RCFHAqpqn4UZ5TzwuQkwt0sxiWulN1rtenubUjzIgUMfrFu7 2uaX+DY3wS8tANv4nx/nj2bqComwmPJIuCiMP7WU= Date: Mon, 30 Mar 2026 14:46:40 -0700 From: Andrew Morton To: Hao Li Cc: "Harry Yoo (Oracle)" , david@kernel.org, osalvador@suse.de, vbabka@suse.cz, joshua.hahnjy@gmail.com, linux-mm@kvack.org, linux-kernel@vger.kernel.org, linux-cxl@vger.kernel.org Subject: Re: [PATCH v2] mm/memory_hotplug: maintain N_NORMAL_MEMORY during hotplug Message-Id: <20260330144640.161ca53e94b37b3252de2e95@linux-foundation.org> In-Reply-To: <23feu42lqvc7iymgaxmnywea7c3qie5vmjm4aijbgdiazwvrcb@mmlxjowgtotv> References: <20260330035941.518186-1-hao.li@linux.dev> <23feu42lqvc7iymgaxmnywea7c3qie5vmjm4aijbgdiazwvrcb@mmlxjowgtotv> X-Mailer: Sylpheed 3.8.0beta1 (GTK+ 2.24.33; x86_64-pc-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-Stat-Signature: ux8986pq9ib7d4djhpnhhiqok9uyorju X-Rspamd-Queue-Id: AE63814000A X-Rspam-User: X-Rspamd-Server: rspam03 X-HE-Tag: 1774907202-283066 X-HE-Meta: U2FsdGVkX1+OGxZY6+RrNsJs0WLdyZDHcCJ5EDTj24qK0NAWu3Jf7/4STMFon3vSvCYzo2FWQwoDEj6RySzv9HE8qvvIGZWtKmAB2HSSYSoOurDfjipoJAa3lxwXxIAb/l0ko89cTPj5R5+OK5Sws8xfPOWGomODhWpwe8qu27vYkRzJCweUZU2QeBlWDVAo84o7lXwTurwXB/7kvDmW3hzGexyplJUFOdF5B0/y2O+zoMj+T14H/EXV1I9OzN6v60rjTT/GF2eEWVhFgDwyf1miHOu/B2OC19V1SVsON3DuOWrFs3nYltTXEvby2oM6wYx/POxqgRPAxhA5DTpijgrLOAnPoHBa0r2gIBm2rxfgQZYyBr5JTyc8wNhVx+gtaxwzHsAL1UgTGpo9MDi8TAnhevLxptsBKbQQpQdfaEdFoqOg3T9h/+P4516ZYL3u2kkK8WQn6xB2me8T6klCPPi3kR068D8j8R6fH3nNBxT9te0SLOp0dahWNb4YpTcFtcvJturmHanX0u0Nqj0h0GeqAh+xJyQWcut1Mu9jf4N6XxshnoumXi0HSqh9y2Oca8jehEzSzxYTu9IvS01OMv9UMGNonaVZwdP/sY1RMgM52cEWHa3YJP+BlEohvH2Sy7rS6BgwxrYjBPwgm4zdWv1xhTiVBFvRBetKVugnjgIfOm/SPb/KjuZKHZ3giXaQnLGks/qPcSyWu0KBJL+NeHBXElxANtUYpxT7zbyuMJYcw/pT1cf1h5WMd2a2pHT/W35S7K1Wl8mepgIlaI2aphXzmrqzaVMDQYpcdgTdfYaYiBZLggYfeECiP82dPzOUwBtgtK8j0HeqH5G1Ey2HDQWAnzdKC4DS+OaThNtRj3sSkTz92d74VpRC6Qx5e+xfaDeNpIBPmNvoWC/tskNFUGcBxFvhVZnq32F2ldi9OnMire1rh841u77NDNmTI+QyquGYnbiyM33JsdSKrv4 rsjBdINJ WwHE5ESkJXu+l+7GBWFxdTuLFUo2by6culT2oPLuq1jH5nV+8zV8kvNszIT8yA1sh3T69q4fVbjdVtvb3e2GGOK0h7HVRXhd6EZkYpK6A0kPuGeMLTdsrDOmAjEEFtNGXU0j/JuAGe50+PrLgGoFDvup7DdXJXJajCF9AsCpuEzwGKrnqMbIUCcBC/S7dSSB1DzD6CFInN15OaJ6ndZ/0tlIKX1LdFyJa6A1H8GCEmCHW2U4Tx2NtEhz4qgZ0ce18Yv9t3TGH7snUdJb8Rt9j+4PrOgBf4F3wU1ljZNnRV5ggBzLzD68n1Su8vK9O3x+uKMmNhnSez3RHTz9lORnMw6VxdgBQCEGZXomy5p701hJco8+97oCYtK5dg+tprxTGoQrbrHfctWWFoyY= Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Mon, 30 Mar 2026 17:34:21 +0800 Hao Li wrote: > > > Current users that benefit include list_lru, zswap, nfsd filecache, > > > hugetlb_cgroup, and has_normal_memory sysfs reporting. > > > > > > Fixes: 8d2882a8edb8 ("mm,memory_hotplug: remove status_change_nid_normal and update documentation") > > > > The Fixes: tag indeed looks correct to me. > > > > By the way, MM needs an explicit Cc: stable@vger.kernel.org for backporting. > > > > Since this commit was introduced in v6.17 and we have v6.18 as LTS, > > this should to be backported to v6.18. > > I had gone back and forth on whether to add the Cc tag, but I'm happy to > include it now! That's OK, I'm very cc:stable-vigilant. Thanks, I'll get this upstreamed during this -rc cycle. I do like our cc:stable patches to include a clear description of the userspace-visible impacts of the bug. Two reasons: - To explain to -stable maintainers why we're requesting the backport. If they care. Heck, and to explain to me why I'm doing this! - To help out someone who is using an older kernel (there are many) who is dealing with a bug report. They're looking at this changelog thinking "hm, I wonder if this patch will fix that bug". Let's add a few words in there to help out with their pattern matching. So, and not for the first time ;), what are the userspace-visible runtime effects of this bug?