This series of patches attempts to fix how CPUs are enumerated by kernel when there's more than 255 of them on single processor. In such case, BIOS may interleave APIC/X2APIC MADT subtables, to obey requirements specified in ACPI spec. Without this patches, kernel then would first enumerate BSP, then X2APIC then APIC, resulting in low APIC IDs to be assigned with high logical IDs and high APIC IDs to be assigned low logical IDs. Biggest consequence of that could be performance penalties due to wrong L2 cache sharing. More details in patch 4/4. Also, simpler approach has been considered, which did not required ACPI parsing interface changes, however it failed to meet requirements. More details can be found here: https://lkml.org/lkml/2015/9/7/285 I've compiled this code successfully for x86/arm64 and verified it on x86. I'd really appreciate if someone could give it a try on arm64. Although interface has changed, semantics stayed the same, thus runtime issues should not appear. Please verify, thanks! Lukasz Anaczkowski (4): acpi: rename acpi_table_parse_entries x86, arm64, acpi: Added acpi_subtable_proc acpi: multi proc support x86, acpi: Handle apic/x2apic entries in MADT in correct order arch/x86/kernel/acpi/boot.c | 39 +++++++++++++++++------- drivers/acpi/numa.c | 13 ++++++-- drivers/acpi/tables.c | 73 +++++++++++++++++++++++++++++++++++---------- drivers/irqchip/irq-gic.c | 15 +++++++--- include/linux/acpi.h | 13 ++++++-- 5 files changed, 119 insertions(+), 34 deletions(-) -- 1.8.3.1 -- To unsubscribe from this list: send the line "unsubscribe linux-acpi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
