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Date: Mon, 19 Jan 2026 11:10:41 +0100
From: Peter Zijlstra <peterz@infradead.org>
To: Thomas Gleixner <tglx@linutronix.de>
Cc: LKML <linux-kernel@vger.kernel.org>,
	Mathieu Desnoyers <mathieu.desnoyers@efficios.com>,
	"Paul E. McKenney" <paulmck@kernel.org>,
	Boqun Feng <boqun.feng@gmail.com>, Jonathan Corbet <corbet@lwn.net>,
	Prakash Sangappa <prakash.sangappa@oracle.com>,
	Madadi Vineeth Reddy <vineethr@linux.ibm.com>,
	K Prateek Nayak <kprateek.nayak@amd.com>,
	Steven Rostedt <rostedt@goodmis.org>,
	Sebastian Andrzej Siewior <bigeasy@linutronix.de>,
	Arnd Bergmann <arnd@arndb.de>, linux-arch@vger.kernel.org,
	Randy Dunlap <rdunlap@infradead.org>,
	Ron Geva <rongevarg@gmail.com>, Waiman Long <longman@redhat.com>
Subject: Re: [patch V6 01/11] rseq: Add fields and constants for time slice
 extension
Message-ID: <20260119101041.GP830755@noisy.programming.kicks-ass.net>
References: <20251215155615.870031952@linutronix.de>
 <20251215155708.669472597@linutronix.de>
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In-Reply-To: <20251215155708.669472597@linutronix.de>

On Mon, Dec 15, 2025 at 05:52:04PM +0100, Thomas Gleixner wrote:

> --- a/include/uapi/linux/rseq.h
> +++ b/include/uapi/linux/rseq.h
> @@ -23,9 +23,15 @@ enum rseq_flags {
>  };
>  
>  enum rseq_cs_flags_bit {
> +	/* Historical and unsupported bits */
>  	RSEQ_CS_FLAG_NO_RESTART_ON_PREEMPT_BIT	= 0,
>  	RSEQ_CS_FLAG_NO_RESTART_ON_SIGNAL_BIT	= 1,
>  	RSEQ_CS_FLAG_NO_RESTART_ON_MIGRATE_BIT	= 2,
> +	/* (3) Intentional gap to put new bits into a separate byte */
> +
> +	/* User read only feature flags */
> +	RSEQ_CS_FLAG_SLICE_EXT_AVAILABLE_BIT	= 4,
> +	RSEQ_CS_FLAG_SLICE_EXT_ENABLED_BIT	= 5,
>  };

Either 's/byte/nibble/' or 's/= [45]/= [78]/' I suppose.