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

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Message-ID: <20251217154050.00003293@huawei.com>
Date: Wed, 17 Dec 2025 15:40:50 +0000
From: Jonathan Cameron <jonathan.cameron@...wei.com>
To: Neeraj Kumar <s.neeraj@...sung.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>
Subject: Re: [PATCH V4 15/17] cxl/pmem_region: Add sysfs attribute cxl
 region label updation/deletion

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())

> +		return rc;
> +
> +	/* Region not yet committed */
> +	if (update && cxlr && cxlr->params.state != CXL_CONFIG_COMMIT) {
> +		dev_dbg(dev, "region not committed, can't update into LSA\n");
> +		return -ENXIO;
> +	}
> +
> +	if (!cxlr || !cxlr->cxlr_pmem || !cxlr->cxlr_pmem->nd_region)
> +		return 0;
> +
> +	rc = nd_region_label_update(cxlr->cxlr_pmem->nd_region);
> +	if (rc)
> +		return rc;
> +
> +	cxlr->params.state_region_label = CXL_REGION_LABEL_ACTIVE;
> +
> +	return len;
> +}