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Message-ID: <20240417131909.7925-4-Jonathan.Cameron@huawei.com>
Date: Wed, 17 Apr 2024 14:18:56 +0100
From: Jonathan Cameron <Jonathan.Cameron@...wei.com>
To: Thomas Gleixner <tglx@...utronix.de>, Peter Zijlstra
<peterz@...radead.org>, <linux-pm@...r.kernel.org>,
<loongarch@...ts.linux.dev>, <linux-acpi@...r.kernel.org>,
<linux-arch@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
<linux-arm-kernel@...ts.infradead.org>, <kvmarm@...ts.linux.dev>,
<x86@...nel.org>, Russell King <linux@...linux.org.uk>, "Rafael J . Wysocki"
<rafael@...nel.org>, Miguel Luis <miguel.luis@...cle.com>, James Morse
<james.morse@....com>, Salil Mehta <salil.mehta@...wei.com>, Jean-Philippe
Brucker <jean-philippe@...aro.org>, Catalin Marinas
<catalin.marinas@....com>, Will Deacon <will@...nel.org>
CC: Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>, Dave
Hansen <dave.hansen@...ux.intel.com>, <linuxarm@...wei.com>,
<justin.he@....com>, <jianyong.wu@....com>
Subject: [PATCH v6 03/16] ACPI: processor: Drop duplicated check on _STA (enabled + present)
The ACPI bus scan will only result in acpi_processor_add() being called
if _STA has already been checked and the result is that the
processor is enabled and present. Hence drop this additional check.
Suggested-by: Rafael J. Wysocki <rafael@...nel.org>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>
---
v6: New patch to drop this unnecessary code. Now I think we only
need to explicitly read STA to print a warning in the ARM64
arch_unregister_cpu() path where we want to know if the
present bit has been unset as well.
---
drivers/acpi/acpi_processor.c | 6 ------
1 file changed, 6 deletions(-)
diff --git a/drivers/acpi/acpi_processor.c b/drivers/acpi/acpi_processor.c
index 7fc924aeeed0..ba0a6f0ac841 100644
--- a/drivers/acpi/acpi_processor.c
+++ b/drivers/acpi/acpi_processor.c
@@ -186,17 +186,11 @@ static void __init acpi_pcc_cpufreq_init(void) {}
#ifdef CONFIG_ACPI_HOTPLUG_CPU
static int acpi_processor_hotadd_init(struct acpi_processor *pr)
{
- unsigned long long sta;
- acpi_status status;
int ret;
if (invalid_phys_cpuid(pr->phys_id))
return -ENODEV;
- status = acpi_evaluate_integer(pr->handle, "_STA", NULL, &sta);
- if (ACPI_FAILURE(status) || !(sta & ACPI_STA_DEVICE_PRESENT))
- return -ENODEV;
-
cpu_maps_update_begin();
cpus_write_lock();
--
2.39.2
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