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    SubjectRe: [NAK] Re: [PATCH -v2 9/9] ACPI, APEI, Generic Hardware Error Source POLL/IRQ/NMI notification type support

    On Mon, 25 Oct 2010, Len Brown wrote:

    > > NAKed-by: Ingo Molnar <>
    > Everybody knows that Linux has a lot to learn about RAS.
    > I think to catch up, we need to play to Linux's strengths
    > of continuous improvement. If we halt patches in this area
    > then we could wait forever for the "perfect design".

    it's not about perfect design. It's about creating new user space
    ABIs. The patches introduce another error reporting user space ABI
    with an ad hoc "fits the needs" design.

    This is my major point of objection.

    I agree that Linux needs improvement on the RAS side, but does this
    lack of features justify a new user space ABI which is totally
    disconnected to existing RAS facilities ?

    No, it does not. It's not our problem that Intel wasted time on
    creating another character device driver to report errors to user
    space. The time spent to do so would have been sufficient to do a
    proper integration into the existing infrastructure.

    I would not care at all if these patches would just introduce some
    weird in kernel interfaces as we can clean that up at will. But
    introducing a new user space ABI is setting the disconnect of RAS
    related facilities into stone.

    From Kconfig:

    EDAC is designed to report errors in the core system.
    These are low-level errors that are reported in the CPU or
    supporting chipset or other subsystems:
    memory errors, cache errors, PCI errors, thermal throttling, etc..
    If unsure, select 'Y'.

    So please explain why your error reporting is so different from the
    above that it justifies a separate facility. And you better come up
    with a real good explanation other than we looked at EDAC and it did
    not fit our needs.



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