drivers: base: cacheinfo: fix x86 with CONFIG_OF enabled

With CONFIG_OF enabled on x86, we get the following error on boot:
"
Failed to find cpu0 device node
Unable to detect cache hierarchy from DT for CPU 0
"
and the cacheinfo fails to get populated in the corresponding sysfs
entries. This is because cache_setup_of_node looks for of_node for
setting up the shared cpu_map without checking that it's already
populated in the architecture specific callback.

In order to indicate that the shared cpu_map is already populated, this
patch introduces a boolean `cpu_map_populated` in struct cpu_cacheinfo
that can be used by the generic code to skip cache_shared_cpu_map_setup.

This patch also sets that boolean for x86.

Cc: Greg Kroah-Hartman <[e-mail]>
Signed-off-by: Sudeep Holla <[e-mail]>
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

arch/x86/kernel/cpu/intel_cacheinfo.c

···
 		ci_leaf_init(this_leaf++, &id4_regs);
 		__cache_cpumap_setup(cpu, idx, &id4_regs);
 	}
+	this_cpu_ci->cpu_map_populated = true;
+
 	return 0;
 }
 

drivers/base/cacheinfo.c

···
 	unsigned int index;
 	int ret;
 
+	if (this_cpu_ci->cpu_map_populated)
+		return 0;
+
 	ret = cache_setup_of_node(cpu);
 	if (ret)
 		return ret;

include/linux/cacheinfo.h

···
 	struct cacheinfo *info_list;
 	unsigned int num_levels;
 	unsigned int num_leaves;
+	bool cpu_map_populated;
 };
 
 /*