linux-kernel - Re: [PATCH v2 15/17] libnvdimm: Set numa

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Date:	Thu, 25 Jun 2015 10:47:48 -0700
From:	Dan Williams <dan.j.williams@...el.com>
To:	Toshi Kani <toshi.kani@...com>
Cc:	"linux-nvdimm@...ts.01.org" <linux-nvdimm@...ts.01.org>,
	Jens Axboe <axboe@...nel.dk>,
	Boaz Harrosh <boaz@...xistor.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Christoph Hellwig <hch@....de>,
	Linux ACPI <linux-acpi@...r.kernel.org>,
	linux-fsdevel <linux-fsdevel@...r.kernel.org>,
	Ingo Molnar <mingo@...nel.org>
Subject: Re: [PATCH v2 15/17] libnvdimm: Set numa_node to NVDIMM devices

On Thu, Jun 25, 2015 at 10:45 AM, Toshi Kani <toshi.kani@...com> wrote:
> On Thu, 2015-06-25 at 05:37 -0400, Dan Williams wrote:
>> From: Toshi Kani <toshi.kani@...com>
>>
>> ACPI NFIT table has System Physical Address Range Structure entries that
>> describe a proximity ID of each range when ACPI_NFIT_PROXIMITY_VALID is
>> set in the flags.
>>
>> Change acpi_nfit_register_region() to map a proximity ID to its node ID,
>> and set it to a new numa_node field of nd_region_desc, which is then
>> conveyed to the nd_region device.
>>
>> The device core arranges for btt and namespace devices to inherit their
>> node from their parent region.
>>
>> Signed-off-by: Toshi Kani <toshi.kani@...com>
>> [djbw: move set_dev_node() from region 'probe' to 'create']
>
> Sorry, I failed to mention other issue, which led me call set_dev_node()
> in probe.  nd_async_device_register() calls device_add(), which does:
>
>         /* use parent numa_node */
>         if (parent)
>                 set_dev_node(dev, dev_to_node(parent));
>
> and overwrites numa_node to -1.  Since region's parent is ndbusN, we
> cannot set numa_node to the parent.  So, I had to set it in probe.

ah, ok.
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