Because 2.3.99+ has "shared_pci_interrupt" options for ATA/IDE...
On Sat, 1 Apr 2000, Andrew Morton wrote:
> Kernel 2.2.15-pre9 on a dual processor BP6. HPT366 controller, latest
> BIOS, UDMA drives on the second IDE controller (hde, hdf). CDROM on the
> primary (hda).
>
> When the kernel is built for SMP it comes up with "ide2: Disabled unable
> to get IRQ -11". No root fs.
>
> The same kernel works fine when built for UP. 2.3.99 works OK both UP
> and SMP.
>
> Under 2.2.15-UP /proc/interrupts says:
>
> CPU0
> 0: 10611 XT-PIC timer
> 1: 68 XT-PIC keyboard
> 2: 0 XT-PIC cascade
> 10: 85 XT-PIC eth0
> 11: 14291 XT-PIC ide2
> 12: 0 XT-PIC PS/2 Mouse
> 13: 1 XT-PIC fpu
> 14: 7 XT-PIC ide0
> NMI: 0
>
> Under 2.3.99-pre4-SMP, /proc/interrupts says:
>
> CPU0 CPU1
> 0: 1833 1651 IO-APIC-edge timer
> 1: 2 3 IO-APIC-edge keyboard
> 2: 0 0 XT-PIC cascade
> 12: 0 0 IO-APIC-edge PS/2 Mouse
> 13: 1 0 XT-PIC fpu
> 14: 7 0 IO-APIC-edge ide0
> 18: 841 857 IO-APIC-level ide2
> 19: 37 39 IO-APIC-level eth0
> NMI: 3386 3386
> LOC: 3396 3395
> ERR: 0
>
> I can provide more details, try patches or run additional test cases on
> request.
>
> --
> -akpm-
>
> -
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>
Andre Hedrick
The Linux ATA/IDE guy
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