From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from galois.linutronix.de (Galois.linutronix.de [193.142.43.55]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 63D61EEA6; Mon, 27 Oct 2025 09:29:04 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=193.142.43.55 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1761557346; cv=none; b=l3JxB6OcBfnKa25HGHS76H24RAbwaDfxbIZq+CExsNJ3mpvAiLvbMED7h7EK5Mp2OkNjUIaDMPeW7SkpSYgmkGOxMq7Gyk2SK5KGNw+Sv+8S4YmcuPCkp3GCdP8st7BhLr07/gBkWCZaZoG+bvTgtCL1RCY/ywUzaihQeRxpmd8= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1761557346; c=relaxed/simple; bh=+BWwjSsK3LJJOmiDFTF+Hy6QpGnroVjKs/vRRZ/rk30=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=lBVGUMkHNiXoPNOoI2eoqH8TrJOAHBeTNJV4c6JPqpm+IaA58koDHVVMVeF3hFtqr59K9dmM4UQZBvTcs3hOM3wN3QwaS5/1yf1yFVzidp4xzy0wfTee/XoDrH1VRPDuV5qlXyQ/V/7ycBCwnAdtWCc9zylM3YOQ3BW+c8cq6Yc= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linutronix.de; spf=pass smtp.mailfrom=linutronix.de; dkim=pass (2048-bit key) header.d=linutronix.de header.i=@linutronix.de header.b=J2p2qfnG; dkim=permerror (0-bit key) header.d=linutronix.de header.i=@linutronix.de header.b=Bpj003fp; arc=none smtp.client-ip=193.142.43.55 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linutronix.de Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linutronix.de Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="J2p2qfnG"; dkim=permerror (0-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="Bpj003fp" Date: Mon, 27 Oct 2025 10:29:01 +0100 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1761557343; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=dN2WGLKJLTILaSCeVMwVxkFyJlJGIPBlamDv+nHPaTc=; b=J2p2qfnGHgRJ3BvgvsnniZWuDKdN+t9UQe7q4baD2L2nnbqDikUapSl1P6FZSGcvqNRLS+ x8wnvprs+MGbc2jGrhGGxYjNsClpyoyGJLbeP9kqDTFsEDqR1wae9tQYwuXu7w0fk6P8RY dbAgASIJ9m1YBdkHfHUspT0OFzTVGLWS1z6FxGdaCn2WF1uZg8xEkcydqPY18TiZb0hVOI G4m2/IJAxWXHgBOcZID72toNFdi2QJaue4xbqXXAkx/1pS4VV7aJUIrd1lELzXF49CqfHv i1pEmcmJiqRPvAMpkW8+27dAO6SFDD2/Vz1OihXdYzKekwWybodGnZjp9ZOpRA== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1761557343; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=dN2WGLKJLTILaSCeVMwVxkFyJlJGIPBlamDv+nHPaTc=; b=Bpj003fprKxxi7SMLMy6A7fyp99rPfNgf0JgjIx7iLe5+S5sd2jP/xu6dFbELSsb7J+cAm yEwDhi4EmySkHBBQ== From: Sebastian Andrzej Siewior To: Thomas Gleixner Cc: LKML , Mathieu Desnoyers , Peter Zijlstra , "Paul E. McKenney" , Boqun Feng , Jonathan Corbet , Prakash Sangappa , Madadi Vineeth Reddy , K Prateek Nayak , Steven Rostedt , Arnd Bergmann , linux-arch@vger.kernel.org Subject: Re: [patch V2 03/12] rseq: Provide static branch for time slice extensions Message-ID: <20251027092901.fm5D-9TX@linutronix.de> References: <20251022110646.839870156@linutronix.de> <20251022121427.091502763@linutronix.de> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <20251022121427.091502763@linutronix.de> 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 > Cc: Mathieu Desnoyers > Cc: Peter Zijlstra > Cc: "Paul E. McKenney" > Cc: Boqun Feng Reviewed-by: Sebastian Andrzej Siewior 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