[PATCH v2 1/7] cacheinfo: Export get_cpu_cacheinfo_id() for loadable modules

[Tony Luck]

From: Qiuxu Zhuo <qiuxu.zhuo@xxxxxxxxx>

get_cpu_cacheinfo_id() is a static inline that requires get_cpu_cacheinfo(),
which is not exported. Modules that need to identify which cache instance
a CPU belongs to therefore cannot use it.

Move it out of line and export it.

Signed-off-by: Qiuxu Zhuo <qiuxu.zhuo@xxxxxxxxx>
Signed-off-by: Tony Luck <tony.luck@xxxxxxxxx>
---
 include/linux/cacheinfo.h | 12 +-----------
 drivers/base/cacheinfo.c  | 17 +++++++++++++++++
 2 files changed, 18 insertions(+), 11 deletions(-)

diff --git a/include/linux/cacheinfo.h b/include/linux/cacheinfo.h
index fc879ac4cc4f..56fa646df0d1 100644
--- a/include/linux/cacheinfo.h
+++ b/include/linux/cacheinfo.h
@@ -82,6 +82,7 @@ struct cpu_cacheinfo {
 };
 
 struct cpu_cacheinfo *get_cpu_cacheinfo(unsigned int cpu);
+int get_cpu_cacheinfo_id(int cpu, int level);
 int early_cache_level(unsigned int cpu);
 int init_cache_level(unsigned int cpu);
 int init_of_cache_level(unsigned int cpu);
@@ -137,17 +138,6 @@ static inline struct cacheinfo *get_cpu_cacheinfo_level(int cpu, int level)
 	return NULL;
 }
 
-/*
- * Get the id of the cache associated with @cpu at level @level.
- * cpuhp lock must be held.
- */
-static inline int get_cpu_cacheinfo_id(int cpu, int level)
-{
-	struct cacheinfo *ci = get_cpu_cacheinfo_level(cpu, level);
-
-	return ci ? ci->id : -1;
-}
-
 #if defined(CONFIG_ARM64) || defined(CONFIG_ARM)
 #define use_arch_cache_info()	(true)
 #else
diff --git a/drivers/base/cacheinfo.c b/drivers/base/cacheinfo.c
index 70701d3bc81c..28d193bf6064 100644
--- a/drivers/base/cacheinfo.c
+++ b/drivers/base/cacheinfo.c
@@ -38,6 +38,23 @@ struct cpu_cacheinfo *get_cpu_cacheinfo(unsigned int cpu)
 	return ci_cacheinfo(cpu);
 }
 
+/**
+ * get_cpu_cacheinfo_id - Return the cache ID for a CPU and cache level
+ * @cpu: CPU number
+ * @level: Cache level
+ *
+ * The caller must hold the cpuhp lock.
+ *
+ * Return: Cache ID on success, or -1 if no matching cache exists.
+ */
+int get_cpu_cacheinfo_id(int cpu, int level)
+{
+	struct cacheinfo *ci = get_cpu_cacheinfo_level(cpu, level);
+
+	return ci ? ci->id : -1;
+}
+EXPORT_SYMBOL_GPL(get_cpu_cacheinfo_id);
+
 static inline bool cache_leaves_are_shared(struct cacheinfo *this_leaf,
 					   struct cacheinfo *sib_leaf)
 {
-- 
2.55.0