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2023-12-09 b22da3d8526a935aa31e086e63f60ff3246cb61c

 kernel/kernel/Kconfig.preempt
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@@ -1,19 +1,10 @@
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-config PREEMPT
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-	bool
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-	select PREEMPT_COUNT
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-
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-config PREEMPT_RT_BASE
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-	bool
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-	select PREEMPT
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-
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-config PREEMPT_RT
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-       bool
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+# SPDX-License-Identifier: GPL-2.0-only
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 config HAVE_PREEMPT_LAZY
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 	bool
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 config PREEMPT_LAZY
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-	def_bool y if HAVE_PREEMPT_LAZY && PREEMPT_RT_FULL
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+	def_bool y if HAVE_PREEMPT_LAZY && PREEMPT_RT
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 choice
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 	prompt "Preemption Model"
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@@ -50,10 +41,10 @@
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 	  Select this if you are building a kernel for a desktop system.
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-config PREEMPT__LL
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+config PREEMPT
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 	bool "Preemptible Kernel (Low-Latency Desktop)"
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 	depends on !ARCH_NO_PREEMPT
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-	select PREEMPT
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+	select PREEMPTION
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 	select UNINLINE_SPIN_UNLOCK if !ARCH_INLINE_SPIN_UNLOCK
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 	help
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 	  This option reduces the latency of the kernel by making
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@@ -70,24 +61,29 @@
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 	  embedded system with latency requirements in the milliseconds
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 	  range.
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-config PREEMPT_RTB
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-	bool "Preemptible Kernel (Basic RT)"
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-	select PREEMPT_RT_BASE
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+config PREEMPT_RT
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+	bool "Fully Preemptible Kernel (Real-Time)"
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+	depends on EXPERT && ARCH_SUPPORTS_RT
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+	select PREEMPTION
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+	select RT_MUTEXES
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 	help
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-	  This option is basically the same as (Low-Latency Desktop) but
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-	  enables changes which are preliminary for the full preemptible
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-	  RT kernel.
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+	  This option turns the kernel into a real-time kernel by replacing
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+	  various locking primitives (spinlocks, rwlocks, etc.) with
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+	  preemptible priority-inheritance aware variants, enforcing
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+	  interrupt threading and introducing mechanisms to break up long
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+	  non-preemptible sections. This makes the kernel, except for very
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+	  low level and critical code paths (entry code, scheduler, low
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+	  level interrupt handling) fully preemptible and brings most
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+	  execution contexts under scheduler control.
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-config PREEMPT_RT_FULL
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-	bool "Fully Preemptible Kernel (RT)"
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-	depends on IRQ_FORCED_THREADING
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-	select PREEMPT_RT_BASE
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-	select PREEMPT_RCU
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-	select PREEMPT_RT
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-	help
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-	  All and everything
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+	  Select this if you are building a kernel for systems which
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+	  require real-time guarantees.
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 endchoice
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 config PREEMPT_COUNT
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        bool
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+
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+config PREEMPTION
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+       bool
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+       select PREEMPT_COUNT