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| author | Peter Zijlstra <peterz@infradead.org> | 2024-10-04 14:46:56 +0200 |
|---|---|---|
| committer | Peter Zijlstra <peterz@infradead.org> | 2024-11-05 12:55:38 +0100 |
| commit | 35772d627b55cc7fb4f33bae57c564a25b3121a9 (patch) | |
| tree | cc854ab9670c42e24105d639c5f697578fa1739b /kernel/Kconfig.preempt | |
| parent | 7c70cb94d29cd325fabe4a818c18613e3b9919a1 (diff) | |
| download | linux-35772d627b55cc7fb4f33bae57c564a25b3121a9.tar.gz linux-35772d627b55cc7fb4f33bae57c564a25b3121a9.tar.bz2 linux-35772d627b55cc7fb4f33bae57c564a25b3121a9.zip | |
sched: Enable PREEMPT_DYNAMIC for PREEMPT_RT
In order to enable PREEMPT_DYNAMIC for PREEMPT_RT, remove PREEMPT_RT
from the 'Preemption Model' choice. Strictly speaking PREEMPT_RT is
not a change in how preemption works, but rather it makes a ton more
code preemptible.
Notably, take away NONE and VOLUNTARY options for PREEMPT_RT, they make
no sense (but are techincally possible).
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Link: https://lkml.kernel.org/r/20241007075055.441622332@infradead.org
Diffstat (limited to 'kernel/Kconfig.preempt')
| -rw-r--r-- | kernel/Kconfig.preempt | 12 |
1 files changed, 7 insertions, 5 deletions
diff --git a/kernel/Kconfig.preempt b/kernel/Kconfig.preempt index 09f06d8964cf..7c1b29a3a491 100644 --- a/kernel/Kconfig.preempt +++ b/kernel/Kconfig.preempt @@ -20,6 +20,7 @@ choice config PREEMPT_NONE bool "No Forced Preemption (Server)" + depends on !PREEMPT_RT select PREEMPT_NONE_BUILD if !PREEMPT_DYNAMIC help This is the traditional Linux preemption model, geared towards @@ -35,6 +36,7 @@ config PREEMPT_NONE config PREEMPT_VOLUNTARY bool "Voluntary Kernel Preemption (Desktop)" depends on !ARCH_NO_PREEMPT + depends on !PREEMPT_RT select PREEMPT_VOLUNTARY_BUILD if !PREEMPT_DYNAMIC help This option reduces the latency of the kernel by adding more @@ -54,7 +56,7 @@ config PREEMPT_VOLUNTARY config PREEMPT bool "Preemptible Kernel (Low-Latency Desktop)" depends on !ARCH_NO_PREEMPT - select PREEMPT_BUILD + select PREEMPT_BUILD if !PREEMPT_DYNAMIC help This option reduces the latency of the kernel by making all kernel code (that is not executing in a critical section) @@ -74,7 +76,7 @@ config PREEMPT_LAZY bool "Scheduler controlled preemption model" depends on !ARCH_NO_PREEMPT depends on ARCH_HAS_PREEMPT_LAZY - select PREEMPT_BUILD + select PREEMPT_BUILD if !PREEMPT_DYNAMIC help This option provides a scheduler driven preemption model that is fundamentally similar to full preemption, but is less @@ -82,6 +84,8 @@ config PREEMPT_LAZY reduce lock holder preemption and recover some of the performance gains seen from using Voluntary preemption. +endchoice + config PREEMPT_RT bool "Fully Preemptible Kernel (Real-Time)" depends on EXPERT && ARCH_SUPPORTS_RT @@ -99,8 +103,6 @@ config PREEMPT_RT Select this if you are building a kernel for systems which require real-time guarantees. -endchoice - config PREEMPT_COUNT bool @@ -110,7 +112,7 @@ config PREEMPTION config PREEMPT_DYNAMIC bool "Preemption behaviour defined on boot" - depends on HAVE_PREEMPT_DYNAMIC && !PREEMPT_RT + depends on HAVE_PREEMPT_DYNAMIC select JUMP_LABEL if HAVE_PREEMPT_DYNAMIC_KEY select PREEMPT_BUILD default y if HAVE_PREEMPT_DYNAMIC_CALL |