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SubjectRE: [GIT PULL] printk for 5.20
> - Completely disable printing on consoles with CONFIG_RT. They break
> RT guarantees. They are too slow to be called with raw spinlocks.
> They can't be called with normal spinlocks in an atomic context because
> RT spinlocks might sleep. It is going to get fixed by the kthreads and
> atomic consoles. In the meantime, the debugging of CONFIG_RT kernel
> will be possible only by the user space kernel log readers.

SYSV used to be like that if you were running syslogd.
Used to make debugging some issues completely impossible.


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