linux-kernel - Re: [patch V2 03/12] rseq: Provide static branch for time slice extensions

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Message-ID: <20251027092901.fm5D-9TX@linutronix.de>
Date: Mon, 27 Oct 2025 10:29:01 +0100
From: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To: Thomas Gleixner <tglx@...utronix.de>
Cc: LKML <linux-kernel@...r.kernel.org>,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	Peter Zijlstra <peterz@...radead.org>,
	"Paul E. McKenney" <paulmck@...nel.org>,
	Boqun Feng <boqun.feng@...il.com>, Jonathan Corbet <corbet@....net>,
	Prakash Sangappa <prakash.sangappa@...cle.com>,
	Madadi Vineeth Reddy <vineethr@...ux.ibm.com>,
	K Prateek Nayak <kprateek.nayak@....com>,
	Steven Rostedt <rostedt@...dmis.org>, Arnd Bergmann <arnd@...db.de>,
	linux-arch@...r.kernel.org
Subject: Re: [patch V2 03/12] rseq: Provide static branch for time slice
 extensions

On 2025-10-22 14:57:32 [+0200], Thomas Gleixner wrote:
> Guard the time slice extension functionality with a static key, which can
> be disabled on the kernel command line.
> 
> Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
> Cc: Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
> Cc: Peter Zijlstra <peterz@...radead.org>
> Cc: "Paul E. McKenney" <paulmck@...nel.org>
> Cc: Boqun Feng <boqun.feng@...il.com>

Reviewed-by: Sebastian Andrzej Siewior <bigeasy@...utronix.de>

Might want to fold:

diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
index 6c42061ca20e5..34325cf61b8de 100644
--- a/Documentation/admin-guide/kernel-parameters.txt
+++ b/Documentation/admin-guide/kernel-parameters.txt
@@ -6482,6 +6482,10 @@
 
 	rootflags=	[KNL] Set root filesystem mount option string
 
+	rseq_slice_ext= [KNL] RSEQ slice extension
+			Disable the slice extension at boot time by
+			setting it to "off". Default is "on".
+
 	initramfs_options= [KNL]
                         Specify mount options for for the initramfs mount.
 

Sebastian