From: Andi Kleen Date: Fri, 7 Apr 2006 17:49:39 +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=d3b6a349d233aecf2c52f7f4c150ca09f684f2d8;p=GitHub%2Fmt8127%2Fandroid_kernel_alcatel_ttab.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. 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 033066176b3e..8dab3527bc97 100644 --- a/arch/i386/kernel/acpi/boot.c +++ b/arch/i386/kernel/acpi/boot.c @@ -215,7 +215,7 @@ static int __init acpi_parse_madt(unsigned long phys_addr, unsigned long size) { struct acpi_table_madt *madt = NULL; - if (!phys_addr || !size) + if (!phys_addr || !size || !cpu_has_apic) return -EINVAL; madt = (struct acpi_table_madt *)__acpi_map_table(phys_addr, size); @@ -751,6 +751,9 @@ static int __init acpi_parse_madt_ioapic_entries(void) return -ENODEV; } + if (!cpu_has_apic) + return -ENODEV; + /* * if "noapic" boot option, don't look for IO-APICs */