From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-qv1-f46.google.com (mail-qv1-f46.google.com [209.85.219.46]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 7B4ED1A38F9 for ; Thu, 5 Mar 2026 01:05:42 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.219.46 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1772672743; cv=none; b=ZpUx21X73UNi4z6pcL53yy3zViYJb5/ha51p4cdhpG/3k19GyXT7g8NUm2Ubp0kpdvtnGdvso4JUmgtMzXMrkQQAWQ7H+mAjDPlwk2m3J0KCrkJh7k8i4FO5ZZPONwETHyz1BoTcPybs/k3q8p2WlS34Uvr/E3U8F0C43a7igqs= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1772672743; c=relaxed/simple; bh=/zKnBOxICMcZw91Ph/QZZ5zni/3oVabpUEVjglg4pqk=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=UegBVKq6ekc8tMwkiOGFTRwS+Dh/jyQv4MQWS+nXnCsy/k1rJmFpucJ7cwJdQ9B5+XeJZmG5a8H+H+pc67NuyCtfGe/M2NdKhZaYGRhpN0W9WtWWYrO2mkPXlDSRoWHKxh33/nn2qKh3EpgKiOp9qf/BSF/Hjq8o4dUg0jVRLGk= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=gourry.net; spf=pass smtp.mailfrom=gourry.net; dkim=pass (2048-bit key) header.d=gourry.net header.i=@gourry.net header.b=s4dijsjx; arc=none smtp.client-ip=209.85.219.46 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=gourry.net Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gourry.net Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gourry.net header.i=@gourry.net header.b="s4dijsjx" Received: by mail-qv1-f46.google.com with SMTP id 6a1803df08f44-899ee87355dso55727066d6.1 for ; Wed, 04 Mar 2026 17:05:42 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gourry.net; s=google; t=1772672741; x=1773277541; darn=vger.kernel.org; h=in-reply-to:content-transfer-encoding:content-disposition :mime-version:references:message-id:subject:cc:to:from:date:from:to :cc:subject:date:message-id:reply-to; bh=b/K8oExowzofbndlmLRvjuXWIIQ5XDDj++/GQGtDPio=; b=s4dijsjxaIrX6GT/LC39ZJE+nsJuDK5i2bO34vqW/4OBaCNLrvJGQGrG74BR2oDCpC Svzr/qdjuf4ztEUMh81DhufQcjn2etz07Z51rpAmh+tAYWMnxte+8UtMOapzCm5Cd7C3 VUlUP4rCcNTxUvlwq4wPwHen+QTq7DhgDdxDK5Pq5Q/t05NceW8Ix1MW7x/hqzR2tWIv ULL/kd+OBeYfT+0EO3hm7uJ74Ob1jau0Icdy005okdpetNc8s8cI0ySZffkwXuvkV9iR g3NseWfeWvsxDtY/9r7h4FMCbMeTVexDdlhN3q7HxAG48/wUb9aeLwQcXDqJv5wgYRVK XRAA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1772672741; x=1773277541; h=in-reply-to:content-transfer-encoding:content-disposition :mime-version:references:message-id:subject:cc:to:from:date:x-gm-gg :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=b/K8oExowzofbndlmLRvjuXWIIQ5XDDj++/GQGtDPio=; b=Gr01qPLJGFn0DNln6yicp4FhB6cg+lZ2lBd9Y9QJLrM7JEmg3poGSNG+guHs/CIjMQ /gCcUbHRFyT4DxCASt3BhBlKGPBP11NiiviJZsy+2+V7QYbfND5p3TFESX+ZSa5Waw5U 4Or6U2FQhdpvKl4/EFlg+FZJ60+ci7gowAPGGuTv5nZTf48oMFJW0vvaovuVhyeoe+wt Kkw8ezEmXnOQB9obdY3J6YBytaEs9lk+gcHj82WJUeSQRMMp13QFjYYUoOcH/OgmNZ8G t/28xm/muPzh1xCuSFSsHV2J8nd7eqkGzdWDWxBhYrvF8DJy+80BluaJ2U1UcHOtI8KZ rHMg== X-Forwarded-Encrypted: i=1; AJvYcCXjWdi8/S4yB+fksldUmMnsJ0Gha/+EaJK5QXriNGJeDPJYMU/pNl1S6KmIcA1UM/wRg9/fO8wBy7Sb84g=@vger.kernel.org X-Gm-Message-State: AOJu0YyUOxufvKbfinazgIUacz+pfVV1xSuV+4Y4eqHWDr0ak7ab6EXS sf02QQpT4Lh8PdW9PFN2kQugiOhltAkx2gRtkGLE4dGIOZl/6UkPZDNcRkTqPGxIc06vvk4JOeB kCflq X-Gm-Gg: ATEYQzxCHsS5DCi6iJtig+gpoXds4SLKB+uJf6wbY1ekuQskevSx8zdfpFY+TDGgI7j Vb4FmKgKRu7KPboqG7F0QCAAcRj5633eH8ASozmRODATdZ8gU8BQfWi7/w0TBDwSujuNwB+tqx1 pAEoyFQ6dEzl8vVpvbVcqQSmMlX3ajILZo39VI2rBZojGPjhBKtUzAQZwQFrj02+9FDzS0VLZ2u a7wUwq/8tlWnIL1YnJd5S14BwnSj1R1fVVY+ArP1oVugezlKHplcnd/ldiaSEhjU8F+Ktjd8m5I 1woCIjUJmIpaLQX7stlW00BoKPZfGrBVviR97C872utVFFEPiRwruJjnmtknYXXV8aDeDwtHbc4 iYHrmUhsA4eRboPf+f2ewQRA3FpVgP+8EpfFXDBByjyLwRcWveoSV1yKe1iTN/oHP7cQiBZ9Opd lL+5K7YG7ArDUQ+FJAdqUyCksWxEvBIGefEYavAbesFMQdMho1xJUh7uEyksmfe1WojT+8hqjTT r2NptrL2Q== X-Received: by 2002:a05:6214:411e:b0:89a:170b:a6f6 with SMTP id 6a1803df08f44-89a19aee4d7mr54977276d6.37.1772672741289; Wed, 04 Mar 2026 17:05:41 -0800 (PST) Received: from gourry-fedora-PF4VCD3F (pool-96-255-20-138.washdc.ftas.verizon.net. [96.255.20.138]) by smtp.gmail.com with ESMTPSA id 6a1803df08f44-899fc21676fsm81448586d6.22.2026.03.04.17.05.40 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 04 Mar 2026 17:05:40 -0800 (PST) Date: Wed, 4 Mar 2026 20:05:38 -0500 From: Gregory Price To: "Huang, Kai" Cc: "nunodasneves@linux.microsoft.com" , "rafael@kernel.org" , "Schofield, Alison" , "thorsten.blum@linux.dev" , "wangyuquan1236@phytium.com.cn" , "linux-kernel@vger.kernel.org" , "Williams, Dan J" , "akpm@linux-foundation.org" , "xueshuai@linux.alibaba.com" , "linux-cxl@vger.kernel.org" , "linux-acpi@vger.kernel.org" , "lenb@kernel.org" Subject: Re: [PATCH] ACPI: NUMA: Only parse CFMWS at boot when CXL_ACPI is on Message-ID: References: <20260304213342.5776-1-kai.huang@intel.com> <4809035f61dcd6ace773532efe46b0f1928be313.camel@intel.com> <178a85c1d5a48938bf866a85d34ee2ba87901d10.camel@intel.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <178a85c1d5a48938bf866a85d34ee2ba87901d10.camel@intel.com> On Thu, Mar 05, 2026 at 12:45:39AM +0000, Huang, Kai wrote: > > > > You are taking something away by nature of compiling something out by > > default that was previously not compiled out by default. > > Yeah, and it is due to "there's a cost" if we don't compile out by default. > > Hope that justifies? Sorry, i don't mean to come off rough - I don't even necessarily disagree with the change here, but it is worth taking a moment to understand whether this is actually a Linux issue or an platform issue. Up until now there's been some assumption that if a device is attached there will be CEDT windows - but this would be the first time i've seen a platform throw up CEDT windows for devices that don't exist. Anyway, this is good information for Linux to know and worth a comment. We don't know what other people have built that depend on the current behavior. > > > > Well, I'm mostly confused why there are CEDT entries for hardware that > > presumably isn't even there - unless this platform is reserving space > > for future hotplug.   > > > > I think this should be the case. > If that's the case then cool :] May be worth a comment in acpi_numa_init_cxl - something like: /* * Some platforms report CEDT CFMWS for hotplug device support. These * windows are unusable without CXL drivers, so don't reserve fake nodes * if they're compiled out - it wastes memory on per-node structures. */ Reviewed-by: Gregory Price ~Gregory