Re: [RFC][PATCH] fix target_cpus() for summit subarch

[William Lee Irwin III]

On Fri, Aug 27, 2004 at 05:24:48PM -0700, john stultz wrote:
> I've been hunting down a bug affecting IBM x440/x445 systems where the
> floppy driver would get spurious interrupts and would not initialize
> properly. 
> After digging James Cleverdon pointed out that target_cpus() is routing
> the interrupts to the clustered apic broadcast mask. This was causing
> multiple interrupts to show up, breaking the floppy init code. 
> This one-liner fix simply routes interrupts to the first cpu to resolve
> this issue.
> Any comments or feedback would be appreciated.

You're using fixed delivery mode, so non-singleton destinations break.
If lowest prio delivery mode saw this, you'd have IO-APIC errata.


-- wli
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