Patch Set 2:
why don't you use "get_acpi_table_revision();" function?
arch/acpi.h contains multiple macros for FADT Major Revisions as per the ACPI specification. I just changed according to the previous hard-coded values in the files via the specific macros in reference.
arch/x86/acpi.c defines the function get_acpi_table_revision which returns ACPI_FADT_REV_ACPI_3_0 for FADT. Should I modify the FADT return case value as per latest ACPI spec(6). What do you think?

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