From: Andi Kleen Date: Tue, 11 Apr 2006 10:54:36 +0000 (+0200) Subject: [PATCH] x86-64/i386: Don't process APICs/IO-APICs in ACPI when APIC is disabled. X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=0fcd270901f731342df64816f277ae7adbd67130;p=GitHub%2FLineageOS%2Fandroid_kernel_samsung_universal7580.git [PATCH] x86-64/i386: Don't process APICs/IO-APICs in ACPI when APIC is disabled. When nolapic was passed or the local APIC was disabled for another reason ACPI would still parse the IO-APICs until these were explicitely disabled with noapic. Usually this resulted in a non booting configuration unless "nolapic noapic" was used. I also disabled the local APIC parsing in this case, although that's only cosmetic (suppresses a few printks) This hopefully makes nolapic work in all cases. Cc: Len Brown Signed-off-by: Andi Kleen Signed-off-by: Linus Torvalds --- diff --git a/arch/i386/kernel/acpi/boot.c b/arch/i386/kernel/acpi/boot.c index 8dab3527bc9..030a0007a4e 100644 --- a/arch/i386/kernel/acpi/boot.c +++ b/arch/i386/kernel/acpi/boot.c @@ -168,7 +168,7 @@ int __init acpi_parse_mcfg(unsigned long phys_addr, unsigned long size) unsigned long i; int config_size; - if (!phys_addr || !size) + if (!phys_addr || !size || !cpu_has_apic) return -EINVAL; mcfg = (struct acpi_table_mcfg *)__acpi_map_table(phys_addr, size); @@ -693,6 +693,9 @@ static int __init acpi_parse_madt_lapic_entries(void) { int count; + if (!cpu_has_apic) + return -ENODEV; + /* * Note that the LAPIC address is obtained from the MADT (32-bit value) * and (optionally) overriden by a LAPIC_ADDR_OVR entry (64-bit value).