Hi Dong Feng
My understanding is that a *sleep* operation may cause block, but a
*wake-up* operation never. And I heard that it is safe to invoke
printk() in an interrupt handler. Of course not put printk() in
__switch_to(), but that seems because of some other reason.
Maybe you're right. My other idea is, since printk deals with console
output, maybe if you are doing it inside an interrupt handler that
directly or indirectly deal with console, then it will trigger oops.
Just another 2 cents speculation.
regards,
Mulyadi
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