From: Jinjie Ruan <ruanjinjie@huawei.com>
To: <corbet@lwn.net>, <skhan@linuxfoundation.org>,
<rdunlap@infradead.org>, <bigeasy@linutronix.de>,
<clrkwllms@kernel.org>, <rostedt@goodmis.org>, <rppt@kernel.org>,
<arnd@arndb.de>, <bp@alien8.de>, <kmehltretter@gmail.com>,
<dapeng1.mi@linux.intel.com>, <elver@google.com>,
<enelsonmoore@gmail.com>, <jlayton@kernel.org>,
<quchaosheng000406@163.com>, <linux-doc@vger.kernel.org>,
<linux-kernel@vger.kernel.org>, <linux-rt-devel@lists.linux.dev>
Cc: <ruanjinjie@huawei.com>
Subject: [PATCH 1/2] docs: kernel-parameters: Drop unsupported preempt= modes
Date: Wed, 28 Oct 2026 10:43:32 +0800 [thread overview]
Message-ID: <20261028024333.795917-2-ruanjinjie@huawei.com> (raw)
In-Reply-To: <20261028024333.795917-1-ruanjinjie@huawei.com>
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@huawei.com>
---
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
next prev parent reply other threads:[~2026-10-28 2:44 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-10-28 2:43 [PATCH 0/2] docs: Remove the " Jinjie Ruan
2026-10-28 2:43 ` Jinjie Ruan [this message]
2026-10-28 15:40 ` [PATCH 1/2] docs: kernel-parameters: Drop " Daniel Pereira
2026-11-02 13:34 ` Sebastian Andrzej Siewior
2026-10-28 2:43 ` [PATCH 2/2] docs: sched-preemption: Fix the list of runtime-selectable models Jinjie Ruan
2026-10-28 15:43 ` Daniel Pereira
2026-11-02 13:34 ` Sebastian Andrzej Siewior
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