linux-kernel - Re: [PATCH 2/2] nvdimm: Set device node in nd_device

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Date:   Tue, 25 Sep 2018 14:11:14 -0700
From:   Alexander Duyck <alexander.h.duyck@...ux.intel.com>
To:     Dan Williams <dan.j.williams@...el.com>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-nvdimm <linux-nvdimm@...ts.01.org>,
        Vishal L Verma <vishal.l.verma@...el.com>,
        Dave Jiang <dave.jiang@...el.com>, zwisler@...nel.org
Subject: Re: [PATCH 2/2] nvdimm: Set device node in nd_device_register



On 9/25/2018 2:08 PM, Dan Williams wrote:
> On Tue, Sep 25, 2018 at 1:56 PM Alexander Duyck
> <alexander.h.duyck@...ux.intel.com> wrote:
>>
>> This change makes it so that we don't repeatedly overwrite the device node
>> for nvdimm regions. The earliest we can set the node is immediately after
>> calling device init, so I have moved the code there so we can avoid
>> rewriting the node with each uevent.
>>
>> Signed-off-by: Alexander Duyck <alexander.h.duyck@...ux.intel.com>
>> ---
>>   drivers/nvdimm/bus.c |   16 ++++++++++------
>>   1 file changed, 10 insertions(+), 6 deletions(-)
>>
>> diff --git a/drivers/nvdimm/bus.c b/drivers/nvdimm/bus.c
>> index 9148015ed803..96f4d0e1706a 100644
>> --- a/drivers/nvdimm/bus.c
>> +++ b/drivers/nvdimm/bus.c
>> @@ -54,12 +54,6 @@ static int to_nd_device_type(struct device *dev)
>>
>>   static int nvdimm_bus_uevent(struct device *dev, struct kobj_uevent_env *env)
>>   {
>> -       /*
>> -        * Ensure that region devices always have their numa node set as
>> -        * early as possible.
>> -        */
>> -       if (is_nd_region(dev))
>> -               set_dev_node(dev, to_nd_region(dev)->numa_node);
>>          return add_uevent_var(env, "MODALIAS=" ND_DEVICE_MODALIAS_FMT,
>>                          to_nd_device_type(dev));
>>   }
>> @@ -519,6 +513,16 @@ void __nd_device_register(struct device *dev)
>>   void nd_device_register(struct device *dev)
>>   {
>>          device_initialize(dev);
>> +
>> +       /*
>> +        * Ensure that region devices always have their NUMA node set as
>> +        * early as possible. This way we are able to make certain that any
>> +        * memory associated with the creation and the creation itself of
>> +        * the region is associated with the correct node.
>> +        */
>> +       if (is_nd_region(dev))
>> +               set_dev_node(dev, to_nd_region(dev)->numa_node);
>> +
>>          __nd_device_register(dev);
> 
> Any reason to not put this inside __nd_device_register()? If you're ok
> with that I can just fix up when applying.

I put it here since regions never call __nd_device_register directly, 
they always call nd_device_register. I figured that by placing it here 
we reduce the impact of this on the other devices that aren't going to 
need it.