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[31.30.174.132]) by smtp.gmail.com with ESMTPSA id e28sm3333482edc.24.2021.06.25.00.06.58 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 25 Jun 2021 00:06:58 -0700 (PDT) Date: Fri, 25 Jun 2021 09:06:56 +0200 From: Andrew Jones To: Gavin Shan Cc: devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, rdunlap@infradead.org, robh+dt@kernel.org, shan.gavin@gmail.com Subject: Re: [PATCH v4] Documentation, dt, numa: Add note to empty NUMA node Message-ID: <20210625070656.j373hveemf5cdch4@gator> References: <20210625052338.4875-1-gshan@redhat.com> <20210625070217.4ffmfe7nwlusbbjc@gator> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20210625070217.4ffmfe7nwlusbbjc@gator> Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, Jun 25, 2021 at 09:02:17AM +0200, Andrew Jones wrote: > On Fri, Jun 25, 2021 at 01:23:38PM +0800, Gavin Shan wrote: > > The empty memory nodes, where no memory resides in, are allowed. > > For these empty memory nodes, the 'len' of 'reg' property is zero. > > The NUMA node IDs are still valid and parsed, but memory can be > > added to them through hotplug afterwards. I finds difficulty to > > get where it's properly documented. > > > > So lets add note to empty memory nodes in the NUMA binding doc. > > > > Signed-off-by: Gavin Shan > > --- > > Documentation/devicetree/bindings/numa.txt | 4 ++++ > > 1 file changed, 4 insertions(+) > > > > diff --git a/Documentation/devicetree/bindings/numa.txt b/Documentation/devicetree/bindings/numa.txt > > index 21b35053ca5a..0fc882e44270 100644 > > --- a/Documentation/devicetree/bindings/numa.txt > > +++ b/Documentation/devicetree/bindings/numa.txt > > @@ -109,6 +109,10 @@ Example: > > Dual socket system consists of 2 boards connected through ccn bus and > > each board having one socket/soc of 8 cpus, memory and pci bus. > > > > +Note that empty memory nodes, which no memory resides in, are allowed. > > +The NUMA node IDs in these empty memory nodes are still valid, but > > +memory can be added into them through hotplug afterwards. > > Please change the second sentence to: > > The NUMA node IDs in these empty memory nodes are still valid and > memory may be added into them through hotplug afterwards. > > But, this doesn't look like the right place for this paragraph. You're > adding the paragraph to the example section, but the example doesn't have > any empty memory nodes. > > I think the paragraph should be added to section "2 - numa-node-id" and an Or maybe even create a new section for it. > example empty memory node should be provided. Also, the commit message > talks about the length of 'reg' being zero, which is an important > distinction which should also be documented. > > Thanks, > drew > > > + > > memory@c00000 { > > device_type = "memory"; > > reg = <0x0 0xc00000 0x0 0x80000000>; > > -- > > 2.23.0 > >