[PATCH 1/2] docs: kernel-parameters: Drop unsupported preempt= modes

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From: Jinjie Ruan

Date: Tue Oct 27 2026 - 22:45:19 EST

Since commit d3d16750693b ("sched: dynamic: Make PREEMPT_DYNAMIC depend
on ARCH_HAS_PREEMPT_LAZY") only "full" and "lazy" are accepted with
CONFIG_PREEMPT_DYNAMIC: every architecture that supports it selects
ARCH_HAS_PREEMPT_LAZY, which excludes the none and voluntary models.
Passing either is rejected with "Dynamic Preempt: unsupported mode".

Remove the two lines so the parameter reference matches the code.

Signed-off-by: Jinjie Ruan <ruanjinjie@xxxxxxxxxx>
---
Documentation/admin-guide/kernel-parameters.txt | 2 --
1 file changed, 2 deletions(-)

diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
index fce0d52b9cfe..11f0b700d56a 100644
--- a/Documentation/admin-guide/kernel-parameters.txt
+++ b/Documentation/admin-guide/kernel-parameters.txt
@@ -5428,8 +5428,6 @@ Kernel parameters

preempt= [KNL]
Select preemption mode if you have CONFIG_PREEMPT_DYNAMIC
- none - Limited to cond_resched() calls
- voluntary - Limited to cond_resched() and might_sleep() calls
full - Any section that isn't explicitly preempt disabled
can be preempted anytime. Tasks will also yield
contended spinlocks (if the critical section isn't
--
2.34.1