Rewriting printk()
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The printk() function is a subject of much ongoing consternation among
kernel developers. Ostensibly, it's just an output routine for sending text
to the console. But unlike a regular print routine, printk() has to be able
to work even under extreme conditions, like when something horrible is
going on and the system needs to utter a few last clues as it breathes its
final breath.
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