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SubjectRe: [BUG] 2.5.73 Scheduling while atomic with taskfile IO and high memory
On Mon, 30 Jun 2003, Zwane Mwaikambo wrote:

> Could you try selecting your specific IDE chipset (or all), it doesn't
> look like PIO is getting along famously with various other bits. I also
> noticed TCQ, do you have any TCQ capable IDE devices?
>

Tried many things, in no particular order

o PCI chipsets disabled
o Disabled TCQ (device doesn't support it anyway)
o DMA disabled and ide_setup_dma() stub function added so it'll compile
o PCI Generic chipset support enabled
o Intel PIIX chipset support enabled
o All chipset under the sun supported

All come up with the same errors. The following workarounds let it
boot

o Removing inc_preempt_count() and dec_preempt_count() from kmap_atomic()
and kunmap_atomic()
o Disabling high memory
o Disabling taskfile IO

A quickie patch to sched.c shows that preempt_count() keeps incrementing
for each time the sleeping while atomic message is printed by the
cpu_idle() thread

--
Mel Gorman
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