linux-kernel - [PATCH v4 1/3] LoongArch: Modify acpi_parse

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Date: Wed, 17 Apr 2024 17:59:49 +0800
From: Tiezhu Yang <yangtiezhu@...ngson.cn>
To: Huacai Chen <chenhuacai@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Arnd Bergmann <arnd@...db.de>,
	Marc Zyngier <maz@...nel.org>
Cc: loongarch@...ts.linux.dev,
	linux-kernel@...r.kernel.org,
	loongson-kernel@...ts.loongnix.cn
Subject: [PATCH v4 1/3] LoongArch: Modify acpi_parse_processor() for non-SMP

When CONFIG_SMP is disabled, mapping won't be created for all cpus.
CPUs more than num_possible_cpus will be ignored. This is preparation
for later patch.

Signed-off-by: Tiezhu Yang <yangtiezhu@...ngson.cn>
---
 arch/loongarch/kernel/acpi.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/arch/loongarch/kernel/acpi.c b/arch/loongarch/kernel/acpi.c
index 5cf59c617126..ccfa90faf0ea 100644
--- a/arch/loongarch/kernel/acpi.c
+++ b/arch/loongarch/kernel/acpi.c
@@ -98,8 +98,15 @@ acpi_parse_processor(union acpi_subtable_headers *header, const unsigned long en
 		return -EINVAL;
 
 	acpi_table_print_madt_entry(&header->common);
+
+	/*
+	 * When CONFIG_SMP is disabled, mapping won't be created for all cpus.
+	 * CPUs more than num_possible_cpus will be ignored.
+	 */
+	if (processor->core_id >= 0 && processor->core_id < num_possible_cpus())
+		acpi_core_pic[processor->core_id] = *processor;
+
 #ifdef CONFIG_SMP
-	acpi_core_pic[processor->core_id] = *processor;
 	set_processor_mask(processor->core_id, processor->flags);
 #endif
 
-- 
2.42.0