From: Al Stone al.stone@linaro.org
In the ACPI 5.1 version of the spec, the struct for the GICC subtable (struct acpi_madt_generic_interrupt) of the MADT is 76 bytes long; in ACPI 6.0, the struct is 80 bytes long. But, there is only one definition in ACPICA for this struct -- and that is the 6.0 version. Hence, when BAD_MADT_ENTRY() compares the struct size to the length in the GICC subtable, it fails if 5.1 structs are in use, and there are systems in the wild that have them.
This patch set first adds macros for easily using the ACPI spec version, and then adds the BAD_MADT_GICC_ENTRY() macro that uses them to check the GICC subtable only, accounting for the difference in specification versions that are possible. The final patch adds in usage of the BAD_MADT_GICC_ENTRY macro. The BAD_MADT_ENTRY() will continue to work as is for all other MADT subtables.
If these patches are acceptable, a cleanup effort will follow to simplify the use of ACPI spec version numbers elsewhere.
Al Stone (3): ACPI: introduce macros for using the ACPI specification version ACPI: add BAD_MADT_GICC_ENTRY() macro ACPI / ARM64: use the new BAD_MADT_GICC_ENTRY macro
arch/arm64/kernel/smp.c | 2 +- drivers/irqchip/irq-gic.c | 2 +- include/linux/acpi.h | 12 ++++++++++++ 3 files changed, 14 insertions(+), 2 deletions(-)