[PATCH 3/9] cxl/region: Limit visibility of cxl_region_contains_resource()

[Dan Williams <dan.j.williams@intel.com>]

The dax_hmem dependency on cxl_region_contains_resource() is a one-off
special case. It is not suitable for other use cases.

Move the definition to the other CONFIG_CXL_REGION guarded definitions in
drivers/cxl/cxl.h and include that by a relative path include. This matches
what drivers/dax/cxl.c does for its limited private usage of CXL core
symbols.

Reduce the symbol export visibility from global to just dax_hmem, to
further clarify its applicability.

Signed-off-by: Dan Williams <dan.j.williams@intel.com>
---
 drivers/cxl/cxl.h         |  5 +++++
 include/cxl/cxl.h         | 15 ---------------
 drivers/cxl/core/region.c |  3 +--
 drivers/dax/hmem/hmem.c   |  2 +-
 4 files changed, 7 insertions(+), 18 deletions(-)
 delete mode 100644 include/cxl/cxl.h

diff --git a/drivers/cxl/cxl.h b/drivers/cxl/cxl.h
index 30a31968f266..84ad04a02bde 100644
--- a/drivers/cxl/cxl.h
+++ b/drivers/cxl/cxl.h
@@ -941,6 +941,7 @@ struct cxl_pmem_region *to_cxl_pmem_region(struct device *dev);
 int cxl_add_to_region(struct cxl_endpoint_decoder *cxled);
 struct cxl_dax_region *to_cxl_dax_region(struct device *dev);
 u64 cxl_port_get_spa_cache_alias(struct cxl_port *endpoint, u64 spa);
+bool cxl_region_contains_resource(struct resource *res);
 #else
 static inline bool is_cxl_pmem_region(struct device *dev)
 {
@@ -963,6 +964,10 @@ static inline u64 cxl_port_get_spa_cache_alias(struct cxl_port *endpoint,
 {
 	return 0;
 }
+static inline bool cxl_region_contains_resource(struct resource *res)
+{
+	return false;
+}
 #endif
 
 void cxl_endpoint_parse_cdat(struct cxl_port *port);
diff --git a/include/cxl/cxl.h b/include/cxl/cxl.h
deleted file mode 100644
index b12d3d0f6658..000000000000
--- a/include/cxl/cxl.h
+++ /dev/null
@@ -1,15 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0-only */
-/* Copyright (c) 2026 Advanced Micro Devices, Inc. */
-#ifndef _CXL_H_
-#define _CXL_H_
-
-#ifdef CONFIG_CXL_REGION
-bool cxl_region_contains_resource(struct resource *res);
-#else
-static inline bool cxl_region_contains_resource(struct resource *res)
-{
-	return false;
-}
-#endif
-
-#endif /* _CXL_H_ */
diff --git a/drivers/cxl/core/region.c b/drivers/cxl/core/region.c
index b72556c1458b..12a9572f34d5 100644
--- a/drivers/cxl/core/region.c
+++ b/drivers/cxl/core/region.c
@@ -12,7 +12,6 @@
 #include <linux/idr.h>
 #include <linux/memory-tiers.h>
 #include <linux/string_choices.h>
-#include <cxl/cxl.h>
 #include <cxlmem.h>
 #include <cxl.h>
 #include "core.h"
@@ -4253,7 +4252,7 @@ bool cxl_region_contains_resource(struct resource *res)
 	return bus_for_each_dev(&cxl_bus_type, NULL, res,
 				region_contains_resource) != 0;
 }
-EXPORT_SYMBOL_GPL(cxl_region_contains_resource);
+EXPORT_SYMBOL_FOR_MODULES(cxl_region_contains_resource, "dax_hmem");
 
 static int cxl_region_can_probe(struct cxl_region *cxlr)
 {
diff --git a/drivers/dax/hmem/hmem.c b/drivers/dax/hmem/hmem.c
index 9ceda6b5cadf..0051e553c33f 100644
--- a/drivers/dax/hmem/hmem.c
+++ b/drivers/dax/hmem/hmem.c
@@ -3,7 +3,7 @@
 #include <linux/memregion.h>
 #include <linux/module.h>
 #include <linux/dax.h>
-#include <cxl/cxl.h>
+#include "../../cxl/cxl.h"
 #include "../bus.h"
 
 static bool region_idle;
-- 
2.53.0