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The documents explain the design concepts behind PREEMPT_RT and highlight key differences necessary to achieve it. It also include a list of requirements that must be fulfilled to support PREEMPT_RT on a given architecture. Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> [jc: tweaked "how they differ" section head] Signed-off-by: Jonathan Corbet <corbet@lwn.net> Link: https://lore.kernel.org/r/20250815093858.930751-4-bigeasy@linutronix.de