linux-kernel - Re: [RFC][PATCH v2 01/21] e820: cheat PMEM as DRAM

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Date:   Wed, 26 Dec 2018 19:41:41 -0800
From:   Matthew Wilcox <willy@...radead.org>
To:     Fengguang Wu <fengguang.wu@...el.com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Linux Memory Management List <linux-mm@...ck.org>,
        Fan Du <fan.du@...el.com>, kvm@...r.kernel.org,
        LKML <linux-kernel@...r.kernel.org>,
        Yao Yuan <yuan.yao@...el.com>,
        Peng Dong <dongx.peng@...el.com>,
        Huang Ying <ying.huang@...el.com>,
        Liu Jingqi <jingqi.liu@...el.com>,
        Dong Eddie <eddie.dong@...el.com>,
        Dave Hansen <dave.hansen@...el.com>,
        Zhang Yi <yi.z.zhang@...ux.intel.com>,
        Dan Williams <dan.j.williams@...el.com>
Subject: Re: [RFC][PATCH v2 01/21] e820: cheat PMEM as DRAM

On Wed, Dec 26, 2018 at 09:14:47PM +0800, Fengguang Wu wrote:
> From: Fan Du <fan.du@...el.com>
> 
> This is a hack to enumerate PMEM as NUMA nodes.
> It's necessary for current BIOS that don't yet fill ACPI HMAT table.
> 
> WARNING: take care to backup. It is mutual exclusive with libnvdimm
> subsystem and can destroy ndctl managed namespaces.

Why depend on firmware to present this "correctly"?  It seems to me like
less effort all around to have ndctl label some namespaces as being for
this kind of use.