[PATCH v4 3/9] dax/hmem: Gate Soft Reserved deferral on DEV_DAX_CXL

Smita Koralahalli
2025-11-20T03:19:43Z

From: Dan Williams <dan.j.williams@intel.com>

Replace IS_ENABLED(CONFIG_CXL_REGION) with IS_ENABLED(CONFIG_DEV_DAX_CXL)
so that HMEM only defers Soft Reserved ranges when CXL DAX support is
enabled. This makes the coordination between HMEM and the CXL stack more
precise and prevents deferral in unrelated CXL configurations.

Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Smita Koralahalli <Smita.KoralahalliChannabasappa@amd.com>
---
drivers/dax/hmem/hmem.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/dax/hmem/hmem.c b/drivers/dax/hmem/hmem.c
index 02e79c7adf75..c2c110b194e5 100644
--- a/drivers/dax/hmem/hmem.c
+++ b/drivers/dax/hmem/hmem.c
@@ -66,7 +66,7 @@ static int hmem_register_device(struct device *host, int target_nid,
long id;
int rc;

- if (IS_ENABLED(CONFIG_CXL_REGION) &&
+ if (IS_ENABLED(CONFIG_DEV_DAX_CXL) &&
region_intersects(res->start, resource_size(res), IORESOURCE_MEM,
IORES_DESC_CXL) != REGION_DISJOINT) {
dev_dbg(host, "deferring range to CXL: %pr\n", res);
--
2.17.1