Why sleeping not allowed after preempt_disable()

["Learning Linux" <learninglinux4@xxxxxxxxx>]

Hi,

Apologies for posting another trivial query. After reading about ISRs
and sleeping, I have cleared my doubts on why ISRs cannot sleep, but I
still cannot understand why a normal kernel thread cannot sleep once
it has disable preemption.

Assuming that the kernel thread does NOT hold any locks, nor any
per-cpu data, why stops it from sleeping after a call to
preempt_disable()?

TIA,

LL
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