linux-kernel - Re: [PATCH V2 04/20] nvdimm/label: CXL labels skip the need for 'interleave-set cookie'

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Message-ID: <1296674576.21757055782845.JavaMail.epsvc@epcpadp2new>
Date: Thu, 4 Sep 2025 19:31:18 +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 V2 04/20] nvdimm/label: CXL labels skip the need for
 'interleave-set cookie'

On 15/08/25 02:02PM, Dave Jiang wrote:
>
>
>On 7/30/25 5:11 AM, Neeraj Kumar wrote:
>> CXL LSA v2.1 utilizes the region labels stored in the LSA for interleave
>> set configuration instead of interleave-set cookie used in previous LSA
>> versions. As interleave-set cookie is not required for CXL LSA v2.1 format
>> so skip its usage for CXL LSA 2.1 format
>>
>> Signed-off-by: Neeraj Kumar <s.neeraj@...sung.com>
>> ---
>>  drivers/nvdimm/namespace_devs.c | 3 ++-
>>  drivers/nvdimm/region_devs.c    | 5 +++++
>>  2 files changed, 7 insertions(+), 1 deletion(-)
>>
>> diff --git a/drivers/nvdimm/namespace_devs.c b/drivers/nvdimm/namespace_devs.c
>> index bdf1ed6f23d8..5b73119dc8fd 100644
>> --- a/drivers/nvdimm/namespace_devs.c
>> +++ b/drivers/nvdimm/namespace_devs.c
>> @@ -1692,7 +1692,8 @@ static struct device *create_namespace_pmem(struct nd_region *nd_region,
>>  	int rc = 0;
>>  	u16 i;
>>
>> -	if (cookie == 0) {
>> +	/* CXL labels skip the need for 'interleave-set cookie' */
>
>This comment doesn't make sense to me. If it's a CXL label, we continue to execute. There's no skipping. Or are you trying to say if it's CXL label, then checking of cookie value is unnecessary? But the cookie value still is being used later on. Maybe a bit more comments on what's going on here would be helpful.
>
>DJ

Yes Dave, For CXL label cookie value is not required. Its being used for
non CXL labels only. Sure, I will elaborate the comments in next patch-set.


Regards,
Neeraj