[BUG] Threaded printk breaks early debugging

[John Ogness]

On 2022-06-10, Peter Geis <pgwipeout at gmail.com> wrote:
> This might be a side effect of the fact that this is on a low powered
> arm64 board. I noticed with threading enabled during large bursts the
> console drops an excessive amount of messages. It's especially
> apparent during the handover from earlycon to the normal console.

I guess you have a very small kernel buffer and are generating unusually
high amounts of messages? Is there a reason you cannot use a larger
buffer?

Or maybe you are generating a constant amount of messages that a serial
port could never keep up with unless it was interfering with the system
in such a way as to slow everything down? This is exactly what printk
should _not_ be used for.

John Ogness