[Linux PPC] Disable PREEMPT

Christian Zigotzky
2026-02-25T05:54:30Z

Hello,

We were previously able to disable PREEMPT in the kernel configuration,
but the latest kernels now enable it by default and it is no longer
possible to disable it.

Is it possible to let us decide whether to activate PREEMPT or not?

Currently we use the following revert patch for our non-preempt kernels.

--- a/kernel/Kconfig.preempt    2026-02-14 10:06:32.000000000 +0000
+++ b/kernel/Kconfig.preempt    2026-02-08 21:03:27.000000000 +0000
@@ -16,13 +16,11 @@ config ARCH_HAS_PREEMPT_LAZY

choice
prompt "Preemption Model"
-    default PREEMPT_LAZY if ARCH_HAS_PREEMPT_LAZY
default PREEMPT_NONE

config PREEMPT_NONE
bool "No Forced Preemption (Server)"
depends on !PREEMPT_RT
-    depends on ARCH_NO_PREEMPT
select PREEMPT_NONE_BUILD if !PREEMPT_DYNAMIC
help
This is the traditional Linux preemption model, geared towards
@@ -37,7 +35,6 @@ config PREEMPT_NONE

config PREEMPT_VOLUNTARY
bool "Voluntary Kernel Preemption (Desktop)"
-    depends on !ARCH_HAS_PREEMPT_LAZY
depends on !ARCH_NO_PREEMPT
depends on !PREEMPT_RT
select PREEMPT_VOLUNTARY_BUILD if !PREEMPT_DYNAMIC

---

Thanks in advance,

Christian