Messages in this thread | | | Subject | Re: [PATCH 2/2] nvdimm: Set device node in nd_device_register | From | Alexander Duyck <> | Date | Tue, 25 Sep 2018 14:35:33 -0700 |
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On 9/25/2018 2:32 PM, Dan Williams wrote: > On Tue, Sep 25, 2018 at 2:11 PM Alexander Duyck > <alexander.h.duyck@linux.intel.com> wrote: >> >> >> >> On 9/25/2018 2:08 PM, Dan Williams wrote: >>> On Tue, Sep 25, 2018 at 1:56 PM Alexander Duyck >>> <alexander.h.duyck@linux.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@linux.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. > > I can't imagine there's much of an impact because we're already > reading the cacheline that has dev->parent so dev->type is already > there. If we're going to add support for looking up the parent node to > schedule namespace registration work to the proper core I would expect > that to appear in the __nd_device_register() common code as well. > > In general the only consideration for calling nd_device_register() vs > __nd_device_register() is whether or not you want a > device_initialize() to occur.
Yeah, I kind of gathered that. If you want to move it feel free to.
- Alex
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