Re: [PATCH V5 05/17] nvdimm/label: Skip region label during ns label DPA reservation

Jonathan Cameron
2026-01-15T17:56:43Z

On Fri, 9 Jan 2026 18:14:25 +0530
Neeraj Kumar <s.neeraj@samsung.com> wrote:

> CXL 3.2 Spec mentions CXL LSA 2.1 Namespace Labels at section
> 9.13.2.5. If Namespace label is present in LSA during
> nvdimm_probe() then dimm-physical-address(DPA) reservation is
> required. But this reservation is not required by cxl region
> label. Therefore if LSA scanning finds any region label, skip it.
>
> Reviewed-by: Dave Jiang <dave.jiang@intel.com>
> Signed-off-by: Neeraj Kumar <s.neeraj@samsung.com>
Reviewed-by: Jonathan Cameron <jonathan.cameron@huawei.com>

> ---
> drivers/nvdimm/label.c | 8 ++++++++
> 1 file changed, 8 insertions(+)
>
> diff --git a/drivers/nvdimm/label.c b/drivers/nvdimm/label.c
> index 9854cb45fb62..169692dfa12c 100644
> --- a/drivers/nvdimm/label.c
> +++ b/drivers/nvdimm/label.c
> @@ -469,6 +469,14 @@ int nd_label_reserve_dpa(struct nvdimm_drvdata *ndd)
> lsa_label = to_lsa_label(ndd, slot);
> nd_label = &lsa_label->ns_label;
>
> + /*
> + * Skip region label. If LSA label is region label
> + * then it don't require dimm-physical-address(DPA)
> + * reservation. Whereas its required for namespace label
> + */
> + if (is_region_label(ndd, lsa_label))
> + continue;
> +
> if (!slot_valid(ndd, lsa_label, slot))
> continue;
>