Preemption on MV78100 (ARMv5TE)?

[MagnusNilsson]

> Oh yeah, here's another fix that isn't in 8.2 that's pretty important,
> at least on kirkwood series chips... Enabling cache write-allocate
> causes data corruption.

Applying that patch made for a proper crash instead of a silent hang (which
I consider a step forward):
"Entropy harvesting: interrupts ethernet point_to_point
vm_fault(0xc4dfc4e4, 0, 2, 0) -> 1
Fatal kernel mode data abort: 'Translation Fault (P)'
trapframe: 0xd8ea2b64
FSR=00000017, FAR=00000018, spsr=600000d3
r0 =000002a0, r1 =00000000, r2 =00000380, r3 =0000001c
r4 =c51115e0, r5 =00000000, r6 =00000000, r7 =00000000
r8 =cbec9c50, r9 =c0bc5da0, r10=c0b4f908, r11=c0bb1178
r12=c0bca52c, ssp=d8ea2bb0, slr=c09f25fc, pc =c09f26f0"

pc is in sleepq_add(), which I assume is reasonable on a system with broken
preemption?



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