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ACPI: CPPC: Check present CPUs for determining _CPC is valid 

As this is a static check, it should be based upon what is currently
present on the system. This makes probeing more deterministic.

While local APIC flags field (lapic_flags) of cpu core in MADT table is
0, then the cpu core won't be enabled. In this case, _CPC won't be found
in this core, and return back to _CPC invalid with walking through
possible cpus (include disable cpus). This is not expected, so switch to
check present CPUs instead.

Reported-by: Jinzhou Su <Jinzhou.Su@amd.com>
Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>
Signed-off-by: Huang Rui <ray.huang@amd.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Mario Limonciello 2021-12-24 09:04:58 +08:00 committed by Rafael J. Wysocki
parent a2c8f92bea
commit 2aeca6bd02
1 changed files with 1 additions and 1 deletions
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2
drivers/acpi/cppc_acpi.c
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@ -413,7 +413,7 @@ bool acpi_cpc_valid(void)
struct cpc_desc *cpc_ptr;
int cpu;
for_each_possible_cpu(cpu) {
for_each_present_cpu(cpu) {
cpc_ptr = per_cpu(cpc_desc_ptr, cpu);
if (!cpc_ptr)
return false;