linux-kernel - Re: [PATCH V4 15/17] cxl/pmem_region: Add sysfs attribute cxl region label updation/deletion

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Message-ID: <20260109123258.nnqfe6pywc2me4ff@test-PowerEdge-R740xd>
Date: Fri, 9 Jan 2026 18:02:58 +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 15/17] cxl/pmem_region: Add sysfs attribute cxl
 region label updation/deletion

On 17/12/25 03:40PM, Jonathan Cameron wrote:
>On Wed, 19 Nov 2025 13:22:53 +0530
>Neeraj Kumar <s.neeraj@...sung.com> wrote:
>
>> Using these attributes region label is added/deleted into LSA. These
>> attributes are called from userspace (ndctl) after region creation.
>>
>> Signed-off-by: Neeraj Kumar <s.neeraj@...sung.com>
>One quick addition to what Dave called out.
>
>Thanks,
>
>Jonathan
>
>> diff --git a/drivers/cxl/core/pmem_region.c b/drivers/cxl/core/pmem_region.c
>> index b45e60f04ff4..be4feb73aafc 100644
>> --- a/drivers/cxl/core/pmem_region.c
>> +++ b/drivers/cxl/core/pmem_region.c
>> @@ -30,9 +30,100 @@ static void cxl_pmem_region_release(struct device *dev)
>>  	kfree(cxlr_pmem);
>>  }
>>
>> +static ssize_t region_label_update_store(struct device *dev,
>> +					 struct device_attribute *attr,
>> +					 const char *buf, size_t len)
>> +{
>> +	struct cxl_pmem_region *cxlr_pmem = to_cxl_pmem_region(dev);
>> +	struct cxl_region *cxlr = cxlr_pmem->cxlr;
>> +	ssize_t rc;
>> +	bool update;
>> +
>> +	rc = kstrtobool(buf, &update);
>> +	if (rc)
>> +		return rc;
>> +
>> +	ACQUIRE(rwsem_write_kill, rwsem)(&cxl_rwsem.region);
>> +	rc = ACQUIRE_ERR(rwsem_write_kill, &rwsem);
>> +	if (rc)
>I'd stick to one style for these.  Elsewhere you have
>	if ((rc = ACQUIRE_ERR())
>

Fixed it accordingly in V5


Regards,
Neeraj