On 3/22/26 12:53 PM, Smita Koralahalli wrote:
> Separate the CXL overlap check from the HMEM registration path and keep
> the platform-device setup in a dedicated __hmem_register_device().
>
> This makes hmem_register_device() the policy entry point for deciding
> whether a range should be deferred to CXL, while __hmem_register_device()
> handles the HMEM registration flow.
>
> No functional changes.
>
> Signed-off-by: Smita Koralahalli <[email protected]>
Reviewed-by: Dave Jiang <[email protected]>
> ---
> drivers/dax/hmem/hmem.c | 24 +++++++++++++++---------
> 1 file changed, 15 insertions(+), 9 deletions(-)
>
> diff --git a/drivers/dax/hmem/hmem.c b/drivers/dax/hmem/hmem.c
> index 1cf7c2a0ee1c..a3d45032355c 100644
> --- a/drivers/dax/hmem/hmem.c
> +++ b/drivers/dax/hmem/hmem.c
> @@ -58,21 +58,14 @@ static void release_hmem(void *pdev)
> platform_device_unregister(pdev);
> }
>
> -static int hmem_register_device(struct device *host, int target_nid,
> - const struct resource *res)
> +static int __hmem_register_device(struct device *host, int target_nid,
> + const struct resource *res)
> {
> struct platform_device *pdev;
> struct memregion_info info;
> long id;
> int rc;
>
> - if (IS_ENABLED(CONFIG_CXL_REGION) &&
> - region_intersects(res->start, resource_size(res), IORESOURCE_MEM,
> - IORES_DESC_CXL) != REGION_DISJOINT) {
> - dev_dbg(host, "deferring range to CXL: %pr\n", res);
> - return 0;
> - }
> -
> rc = region_intersects_soft_reserve(res->start, resource_size(res));
> if (rc != REGION_INTERSECTS)
> return 0;
> @@ -123,6 +116,19 @@ static int hmem_register_device(struct device *host, int
> target_nid,
> return rc;
> }
>
> +static int hmem_register_device(struct device *host, int target_nid,
> + const struct resource *res)
> +{
> + if (IS_ENABLED(CONFIG_CXL_REGION) &&
> + region_intersects(res->start, resource_size(res), IORESOURCE_MEM,
> + IORES_DESC_CXL) != REGION_DISJOINT) {
> + dev_dbg(host, "deferring range to CXL: %pr\n", res);
> + return 0;
> + }
> +
> + return __hmem_register_device(host, target_nid, res);
> +}
> +
> static int dax_hmem_platform_probe(struct platform_device *pdev)
> {
> return walk_hmem_resources(&pdev->dev, hmem_register_device);
