From 102a0743326a03cd1a1202ceda21e175b7d3575c Mon Sep 17 00:00:00 2001
From: hc <hc@nodka.com>
Date: Tue, 20 Feb 2024 01:20:52 +0000
Subject: [PATCH] add new system file
---
kernel/kernel/Kconfig.preempt | 53 +++++++++++++++++++++--------------------------------
1 files changed, 21 insertions(+), 32 deletions(-)
diff --git a/kernel/kernel/Kconfig.preempt b/kernel/kernel/Kconfig.preempt
index fd924c0..bf82259 100644
--- a/kernel/kernel/Kconfig.preempt
+++ b/kernel/kernel/Kconfig.preempt
@@ -1,19 +1,4 @@
-config PREEMPT
- bool
- select PREEMPT_COUNT
-
-config PREEMPT_RT_BASE
- bool
- select PREEMPT
-
-config PREEMPT_RT
- bool
-
-config HAVE_PREEMPT_LAZY
- bool
-
-config PREEMPT_LAZY
- def_bool y if HAVE_PREEMPT_LAZY && PREEMPT_RT_FULL
+# SPDX-License-Identifier: GPL-2.0-only
choice
prompt "Preemption Model"
@@ -50,10 +35,10 @@
Select this if you are building a kernel for a desktop system.
-config PREEMPT__LL
+config PREEMPT
bool "Preemptible Kernel (Low-Latency Desktop)"
depends on !ARCH_NO_PREEMPT
- select PREEMPT
+ select PREEMPTION
select UNINLINE_SPIN_UNLOCK if !ARCH_INLINE_SPIN_UNLOCK
help
This option reduces the latency of the kernel by making
@@ -70,24 +55,28 @@
embedded system with latency requirements in the milliseconds
range.
-config PREEMPT_RTB
- bool "Preemptible Kernel (Basic RT)"
- select PREEMPT_RT_BASE
+config PREEMPT_RT
+ bool "Fully Preemptible Kernel (Real-Time)"
+ depends on EXPERT && ARCH_SUPPORTS_RT
+ select PREEMPTION
help
- This option is basically the same as (Low-Latency Desktop) but
- enables changes which are preliminary for the full preemptible
- RT kernel.
+ This option turns the kernel into a real-time kernel by replacing
+ various locking primitives (spinlocks, rwlocks, etc.) with
+ preemptible priority-inheritance aware variants, enforcing
+ interrupt threading and introducing mechanisms to break up long
+ non-preemptible sections. This makes the kernel, except for very
+ low level and critical code paths (entry code, scheduler, low
+ level interrupt handling) fully preemptible and brings most
+ execution contexts under scheduler control.
-config PREEMPT_RT_FULL
- bool "Fully Preemptible Kernel (RT)"
- depends on IRQ_FORCED_THREADING
- select PREEMPT_RT_BASE
- select PREEMPT_RCU
- select PREEMPT_RT
- help
- All and everything
+ Select this if you are building a kernel for systems which
+ require real-time guarantees.
endchoice
config PREEMPT_COUNT
bool
+
+config PREEMPTION
+ bool
+ select PREEMPT_COUNT
--
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