Linux 6.3 printk Changes Prepare For Threaded/Atomic Consoles

Sent out today for the Linux 6.3 kernel merge window are the updates to the printk code. Notable this time around are preparations to printk in working toward threaded/atomic consoles support. That threaded/atomic consoles support is all the more important as it's the last piece of the puzzle before the remainder of the real-time (PREEMPT_RT) patches can be upstreamed into the Linux kernel...