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SubjectRe: [PATCH v4 0/2] Fix how CPUs are enumerated when there's more than 255 CPUs
On Wednesday, September 09, 2015 03:47:27 PM Lukasz Anaczkowski wrote:
> 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 2/2.
> 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:
> Lukasz Anaczkowski (2):
> acpi: Added acpi_subtable_proc to ACPI table parsers
> x86, acpi: Handle apic/x2apic entries in MADT in correct order
> arch/x86/kernel/acpi/boot.c | 22 +++++++++--
> drivers/acpi/tables.c | 91 ++++++++++++++++++++++++++++++++++++---------
> include/linux/acpi.h | 19 ++++++++--
> 3 files changed, 107 insertions(+), 25 deletions(-)


Does anyone in the CC have any objections against merging this series?

If not, I'll queue it up as 4.3-rc material.


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