FYI, we noticed the below changes on git://linux-arm.org/linux-skn acpi_lpi commit 2e32ea0d903e576c4755b8f48793f758203c28ae ("ACPI: add in a bad_madt_entry() function to eventually replace the macro") We found the following new stuff in kernel log after your commit. [ 0.000000] ACPI: undefined MADT subtable type for FADT 1.0: 4 (length 6) [ 0.000000] ACPI: Error parsing LAPIC NMI entry [ 0.000000] ACPI: Invalid BIOS MADT, disabling ACPI Thanks, Ying Huang