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

[ Upstream commit 2aeca6bd02776d7f56a49a32be0dd184f204d888 ]

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>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/acpi/cppc_acpi.c b/drivers/acpi/cppc_acpi.c
index 3fbb17ecce2d5094dca27e55d2c2c5b2a0879a81..6fe28a2d387bdc8e59913cc7bfd22364fbcc0de1 100644 (file)
--- a/drivers/acpi/cppc_acpi.c
+++ b/drivers/acpi/cppc_acpi.c
@@ -411,7 +411,7 @@ 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;