[bug report] arch_topology: Build cacheinfo from primary CPU

[Dan Carpenter <error27@xxxxxxxxx>]

Hello Pierre Gondois,

The patch 5944ce092b97: "arch_topology: Build cacheinfo from primary
CPU" from Jan 4, 2023, leads to the following Smatch static checker
warning:

drivers/base/cacheinfo.c:440 fetch_cache_info()	error: uninitialized symbol 'levels'.
drivers/base/cacheinfo.c:447 fetch_cache_info() error: uninitialized symbol 'split_levels'.

drivers/base/cacheinfo.c
    424 int fetch_cache_info(unsigned int cpu)
    425 {
    426         struct cpu_cacheinfo *this_cpu_ci;
    427         unsigned int levels, split_levels;
    428         int ret;
    429 
    430         if (acpi_disabled) {
    431                 ret = init_of_cache_level(cpu);
    432                 if (ret < 0)
    433                         return ret;
    434         } else {
    435                 ret = acpi_get_cache_info(cpu, &levels, &split_levels);
    436                 if (ret < 0)
    437                         return ret;

Apparently, I must have CONFIG_ACPI_PPTT disabled.

    438 
    439                 this_cpu_ci = get_cpu_cacheinfo(cpu);
--> 440                 this_cpu_ci->num_levels = levels;
                                                  ^^^^^^
Unititialized.

    441                 /*
    442                  * This assumes that:
    443                  * - there cannot be any split caches (data/instruction)
    444                  *   above a unified cache
    445                  * - data/instruction caches come by pair
    446                  */
    447                 this_cpu_ci->num_leaves = levels + split_levels;
    448         }
    449         if (!cache_leaves(cpu))
    450                 return -ENOENT;
    451 
    452         return allocate_cache_info(cpu);
    453 }

regards,
dan carpenter