[PATCH] RISC-V: cacheinfo: add init_cache_level()

[Yunhui Cui]

When cacheinfo_sysfs_init() is executed, the general weak function
init_cache_level() returns -ENOENT, causing failure to add the "cache"
node to /sys/devices/system/cpu/cpux/. Implement the init_cache_level()
function on RISC-V to fix it.

Signed-off-by: Yunhui Cui <cuiyunhui at bytedance.com>
---
 arch/riscv/kernel/cacheinfo.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/arch/riscv/kernel/cacheinfo.c b/arch/riscv/kernel/cacheinfo.c
index 09e9b88110d1..be9169a38bac 100644
--- a/arch/riscv/kernel/cacheinfo.c
+++ b/arch/riscv/kernel/cacheinfo.c
@@ -71,6 +71,12 @@ static void ci_leaf_init(struct cacheinfo *this_leaf,
 	this_leaf->type = type;
 }
 
+int init_cache_level(unsigned int cpu)
+{
+	/* The topology has been parsed by acpi or dt, return true. */
+	return 0;
+}
+
 int populate_cache_leaves(unsigned int cpu)
 {
 	struct cpu_cacheinfo *this_cpu_ci = get_cpu_cacheinfo(cpu);
-- 
2.20.1