cacheinfo: rename of_node to fw_token

Rename and change the type of of_node to indicate
it is a generic pointer which is generally only used
for comparison purposes. In a later patch we will put
an ACPI/PPTT token pointer in fw_token so that
the code which builds the shared cpu masks can be reused.

Tested-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Tested-by: Vijaya Kumar K <vkilari@codeaurora.org>
Tested-by: Xiongfeng Wang <wangxiongfeng2@huawei.com>
Tested-by: Tomasz Nowicki <Tomasz.Nowicki@cavium.com>
Acked-by: Sudeep Holla <sudeep.holla@arm.com>
Acked-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Jeremy Linton <jeremy.linton@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>

drivers/base/cacheinfo.c

@@ -35,7 +35,7 @@ struct cpu_cacheinfo *get_cpu_cacheinfo(unsigned int cpu)
 static inline bool cache_leaves_are_shared(struct cacheinfo *this_leaf,
 					   struct cacheinfo *sib_leaf)
 {
-	return sib_leaf->of_node == this_leaf->of_node;
+	return sib_leaf->fw_token == this_leaf->fw_token;
 }
 
 /* OF properties to query for a given cache type */
@@ -167,9 +167,10 @@ static int cache_setup_of_node(unsigned int cpu)
 	struct cpu_cacheinfo *this_cpu_ci = get_cpu_cacheinfo(cpu);
 	unsigned int index = 0;
 
-	/* skip if of_node is already populated */
-	if (this_cpu_ci->info_list->of_node)
+	/* skip if fw_token is already populated */
+	if (this_cpu_ci->info_list->fw_token) {
 		return 0;
+	}
 
 	if (!cpu_dev) {
 		pr_err("No cpu device for CPU %d\n", cpu);
@@ -190,7 +191,7 @@ static int cache_setup_of_node(unsigned int cpu)
 		if (!np)
 			break;
 		cache_of_set_props(this_leaf, np);
-		this_leaf->of_node = np;
+		this_leaf->fw_token = np;
 		index++;
 	}
 
@@ -278,7 +279,7 @@ static void cache_shared_cpu_map_remove(unsigned int cpu)
 			cpumask_clear_cpu(cpu, &sib_leaf->shared_cpu_map);
 			cpumask_clear_cpu(sibling, &this_leaf->shared_cpu_map);
 		}
-		of_node_put(this_leaf->of_node);
+		of_node_put(this_leaf->fw_token);
 	}
 }
 
@@ -323,8 +324,9 @@ static int detect_cache_attributes(unsigned int cpu)
 	if (ret)
 		goto free_ci;
 	/*
-	 * For systems using DT for cache hierarchy, of_node and shared_cpu_map
-	 * will be set up here only if they are not populated already
+	 * For systems using DT for cache hierarchy, fw_token
+	 * and shared_cpu_map will be set up here only if they are
+	 * not populated already
 	 */
 	ret = cache_shared_cpu_map_setup(cpu);
 	if (ret) {

include/linux/cacheinfo.h

@@ -34,9 +34,8 @@ enum cache_type {
  * @shared_cpu_map: logical cpumask representing all the cpus sharing
  *	this cache node
  * @attributes: bitfield representing various cache attributes
- * @of_node: if devicetree is used, this represents either the cpu node in
- *	case there's no explicit cache node or the cache node itself in the
- *	device tree
+ * @fw_token: Unique value used to determine if different cacheinfo
+ *	structures represent a single hardware cache instance.
  * @disable_sysfs: indicates whether this node is visible to the user via
  *	sysfs or not
  * @priv: pointer to any private data structure specific to particular
@@ -65,8 +64,7 @@ struct cacheinfo {
 #define CACHE_ALLOCATE_POLICY_MASK	\
 	(CACHE_READ_ALLOCATE | CACHE_WRITE_ALLOCATE)
 #define CACHE_ID		BIT(4)
-
-	struct device_node *of_node;
+	void *fw_token;
 	bool disable_sysfs;
 	void *priv;
 };