linux-kernel - Re: [PATCH V4 03/17] nvdimm/label: Add namespace/region label support as per LSA 2.1

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Message-ID: <1983025922.01768145102396.JavaMail.epsvc@epcpadp1new>
Date: Fri, 9 Jan 2026 17:16:32 +0530
From: Neeraj Kumar <s.neeraj@...sung.com>
To: Dave Jiang <dave.jiang@...el.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 03/17] nvdimm/label: Add namespace/region label
 support as per LSA 2.1

On 19/11/25 08:51AM, Dave Jiang wrote:
>
>
>On 11/19/25 12:52 AM, Neeraj Kumar wrote:
>> Modify __pmem_label_update() to update region labels into LSA
>>
>> CXL 3.2 Spec mentions CXL LSA 2.1 Namespace Labels at section 9.13.2.5
>> Modified __pmem_label_update() using setter functions to update
>> namespace label as per CXL LSA 2.1
>>
>> Create export routine nd_region_label_update() used for creating
>> region label into LSA. It will be used later from CXL subsystem
>>
>> Signed-off-by: Neeraj Kumar <s.neeraj@...sung.com>
>
>A few nits below, otherwise
>Reviewed-by: Dave Jiang <dave.jiang@...el.com>
>
>
>> ---
>>  drivers/nvdimm/label.c          | 360 ++++++++++++++++++++++++++------
>>  drivers/nvdimm/label.h          |  17 +-
>>  drivers/nvdimm/namespace_devs.c |  25 ++-
>>  drivers/nvdimm/nd.h             |  66 ++++++
>>  include/linux/libnvdimm.h       |   8 +
>>  5 files changed, 406 insertions(+), 70 deletions(-)
>>
>> +static unsigned long find_slot(struct nvdimm_drvdata *ndd,
>> +			       unsigned long label)
>> +{
>> +	unsigned long base;
>> +
>> +	base = (unsigned long) nd_label_base(ndd);
>
>No need for space after casting

Fixed it in V5

>
>> +	return (label - base) / sizeof_namespace_label(ndd);
>> +}

<snip>

>> +static int __pmem_label_update(struct nd_region *nd_region,
>> +			       struct nd_mapping *nd_mapping,
>> +			       struct nd_namespace_pmem *nspm,
>> +			       int pos, unsigned long flags,
>> +			       enum label_type ltype)
>> +{
>> +	struct nd_interleave_set *nd_set = nd_region->nd_set;
>> +	struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
>> +	struct nd_namespace_index *nsindex;
>> +	struct nd_label_ent *label_ent;
>> +	union nd_lsa_label *lsa_label;
>> +	unsigned long *free;
>> +	struct device *dev;
>> +	u32 nslot, slot;
>> +	size_t offset;
>> +	int rc;
>> +
>> -	nd_dbg_dpa(nd_region, ndd, res, "\n");
>> +	lsa_label = to_lsa_label(ndd, slot);
>> +	memset(lsa_label, 0, sizeof_namespace_label(ndd));
>> +
>> +	switch (ltype) {
>> +	case NS_LABEL_TYPE:
>> +		dev = &nspm->nsio.common.dev;
>> +		rc = namespace_label_update(nd_region, nd_mapping,
>> +				nspm, pos, flags, &lsa_label->ns_label,
>> +				nsindex, slot);
>> +		if (rc)
>> +			return rc;
>> +
>> +		break;
>> +	case RG_LABEL_TYPE:
>> +		dev = &nd_region->dev;
>> +		region_label_update(nd_region, &lsa_label->region_label,
>> +				    nd_mapping, pos, flags, slot);
>
>inconsistent tabbing this one vs the case above. Should pick the one that conforms to the rest of this file. And yeah I get it. The tab formatting under nvdimm is different than CXL and it's a pain going between the two.
>
>DJ

Thanks Dave, I have fixed it in V5, Will be sending it soon


Regards,
Neeraj