Commit 2aeca6bd authored by Mario Limonciello's avatar Mario Limonciello Committed by Rafael J. Wysocki
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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: default avatarJinzhou Su <Jinzhou.Su@amd.com>
Signed-off-by: default avatarMario Limonciello <mario.limonciello@amd.com>
Signed-off-by: default avatarHuang Rui <ray.huang@amd.com>
Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
parent a2c8f92b

drivers/acpi/cppc_acpi.c

+1 −1
Original line number Diff line number Diff line
@@ -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;