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    SubjectRe: [RFC][PATCH] irq0 affinity broke on some i386 boxes
    Date
    > On Mon, 25 Feb 2002, Joe Korty wrote:
    >
    >> The following patch fixes a bug that prevents a write to
    >> /proc/irq/0/smp_affinity from actually changing the cpu affinity
    >> of IRQ #0, on all the (Dell server) SMP machines I have access to.
    >
    > A nice spotting. However what you describe is only a side effect of the
    > bug, which is the IRQ is kept registered at the wrong pin. It's only
    > because the timer is special and it's edge-triggered it remained unnoticed
    > for so long.
    >
    > I propose the following patch. [...]
    >
    > I don't know if the changes are relevant to your system as you haven't
    > sent the relevant fragment of a bootstrap log from your system. They
    > affect all systems that have a bogus IRQ 0 entry in the MP table. For
    > other systems the patch is equivalent to yours. Please test it if it
    > works for you as I don't have a suitable system with IRQ 0 unconnected
    > (I've been able to verify it builds only). Everyone with such a system is
    > invited to test the patch as well.


    Thanks. Your proposed patch works fine on the two of my five SMP systems
    I have been able to get my hands on this afternoon.

    Joe

    PS: My original dmesg logs may now be found at
    http://www.mindspring.com/~jakorty/irq0.bugreport.orig.
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