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

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Message-ID: <1435254317.11808.327.camel@misato.fc.hp.com>
Date:	Thu, 25 Jun 2015 11:45:17 -0600
From:	Toshi Kani <toshi.kani@...com>
To:	Dan Williams <dan.j.williams@...el.com>
Cc:	linux-nvdimm@...ts.01.org, axboe@...nel.dk, boaz@...xistor.com,
	linux-kernel@...r.kernel.org, hch@....de,
	linux-acpi@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	mingo@...nel.org
Subject: Re: [PATCH v2 15/17] libnvdimm: Set numa_node to NVDIMM devices

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. 

Thanks,
-Toshi

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