From 2aeca6bd02776d7f56a49a32be0dd184f204d888 Mon Sep 17 00:00:00 2001
From: Mario Limonciello <mario.limonciello@amd.com>
Date: Fri, 24 Dec 2021 09:04:58 +0800
Subject: [PATCH] ACPI: CPPC: Check present CPUs for determining _CPC is valid
Git-commit: 2aeca6bd02776d7f56a49a32be0dd184f204d888
Patch-mainline: v5.17-rc1
References: git-fixes
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>
Acked-by: Takashi Iwai <tiwai@suse.de>
---
drivers/acpi/cppc_acpi.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/acpi/cppc_acpi.c b/drivers/acpi/cppc_acpi.c
index 69e074647003..cc790037d643 100644
--- a/drivers/acpi/cppc_acpi.c
+++ b/drivers/acpi/cppc_acpi.c
@@ -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;
--
2.31.1