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    SubjectRe: [PATCH 04/76] ACPICA: Fix regression in FADT revision checks
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    On Fri, Mar 30, 2012 at 6:13 AM, Len Brown <lenb@kernel.org> wrote:
    > From: Julian Anastasov <ja@ssi.bg>
    >
    >        commit 64b3db22c04586997ab4be46dd5a5b99f8a2d390 (2.6.39),
    > "Remove use of unreliable FADT revision field" causes regression
    > for old P4 systems because now cst_control and other fields are
    > not reset to 0.
    >
    >        The effect is that acpi_processor_power_init will notice
    > cst_control != 0 and a write to CST_CNT register is performed
    > that should not happen. As result, the system oopses after the
    > "No _CST, giving up" message, sometimes in acpi_ns_internalize_name,
    > sometimes in acpi_ns_get_type, usually at random places. May be
    > during migration to CPU 1 in acpi_processor_get_throttling.
    >
    >        Every one of these settings help to avoid this problem:
    >  - acpi=off
    >  - processor.nocst=1
    >  - maxcpus=1
    >
    >        The fix is to update acpi_gbl_FADT.header.length after
    > the original value is used to check for old revisions.
    >
    > https://bugzilla.kernel.org/show_bug.cgi?id=42700
    > https://bugzilla.redhat.com/show_bug.cgi?id=727865
    >
    > Signed-off-by: Julian Anastasov <ja@ssi.bg>
    > Acked-by: Bob Moore <robert.moore@intel.com>
    > Signed-off-by: Len Brown <len.brown@intel.com>

    This one should go into the stable trees. The bug it fixes causes a
    number of machines to not boot with anything newer than 2.6.38.

    josh
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