linux-kernel - Re: [PATCH V4 08/17] nvdimm/label: Preserve cxl region information from region label

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Message-ID: <20260109120648.ndlr3qdzzqku3dzc@test-PowerEdge-R740xd>
Date: Fri, 9 Jan 2026 17:36:48 +0530
From: Neeraj Kumar <s.neeraj@...sung.com>
To: Jonathan Cameron <jonathan.cameron@...wei.com>
Cc: linux-cxl@...r.kernel.org, nvdimm@...ts.linux.dev,
	linux-kernel@...r.kernel.org, gost.dev@...sung.com,
	a.manzanares@...sung.com, vishak.g@...sung.com, neeraj.kernel@...il.com,
	cpgs@...sung.com
Subject: Re: [PATCH V4 08/17] nvdimm/label: Preserve cxl region information
 from region label

On 17/12/25 03:09PM, Jonathan Cameron wrote:
>On Wed, 19 Nov 2025 13:22:46 +0530
>Neeraj Kumar <s.neeraj@...sung.com> wrote:
>
>> Preserve region information from region label during nvdimm_probe. This
>> preserved region information is used for creating cxl region to achieve
>> region persistency across reboot.
>>
>> Signed-off-by: Neeraj Kumar <s.neeraj@...sung.com>
>Trivial comments inline.  As Dave asked, what's the plan for multiple?

Multi-interleave support will require some more efforts on top of this change
So will take it in another series.
Yes, I will prepare in next patch series


>Add some brief notes to the patch description on this.

Yes, I have updated it in commit description

>
>Thanks,
>
>Jonathan
>
>> ---
>>  drivers/nvdimm/dimm.c     |  4 ++++
>>  drivers/nvdimm/label.c    | 40 +++++++++++++++++++++++++++++++++++++++
>>  drivers/nvdimm/nd-core.h  |  2 ++
>>  drivers/nvdimm/nd.h       |  1 +
>>  include/linux/libnvdimm.h | 14 ++++++++++++++
>>  5 files changed, 61 insertions(+)
>>
>>

<snip>

>> +int nvdimm_cxl_region_preserve(struct nvdimm_drvdata *ndd)
>> +{
>> +	struct nvdimm *nvdimm = to_nvdimm(ndd->dev);
>> +	struct cxl_pmem_region_params *p = &nvdimm->cxl_region_params;
>> +	struct nd_namespace_index *nsindex;
>> +	unsigned long *free;
>> +	u32 nslot, slot;
>> +
>> +	if (!preamble_current(ndd, &nsindex, &free, &nslot))
>> +		return 0; /* no label, nothing to preserve */
>> +
>> +	for_each_clear_bit_le(slot, free, nslot) {
>> +		union nd_lsa_label *lsa_label;
>> +		struct cxl_region_label *region_label;
>> +		uuid_t *region_uuid;
>> +
>> +		lsa_label = to_lsa_label(ndd, slot);
>> +		region_label = &lsa_label->region_label;
>> +		region_uuid = (uuid_t *) &region_label->type;
>> +
>		union nd_lsa_label *lsa_label = to_lsa_label(ndd, slot);
>		struct cxl_region_label *region_label = &lsa_label->region_label;
>//I'd go long on thi sone as only just over 80 and helps readability.
>		uuid_t *region_uuid = (uuid_t *)&region_label->type;
>
>Saves a fine lines and there doesn't seem to be an obvious reason
>not to do so.

I have fixed in V5, Will be sending it soon.


Regards,
Neeraj