From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from casper.infradead.org (casper.infradead.org [90.155.50.34]) (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 AB280298CB5 for ; Tue, 8 Jul 2025 07:50:29 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=90.155.50.34 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1751961031; cv=none; b=k11lAqxv5QQSyaAlcupObWOLDSsVMINwZHR1+E/otcZQXtDlQKKSpfKMKN0k5PJG9qxYgfc5Ya75ae9AIyk1VLOUSd34izglrw9qzT4b4cRcs2kQI/zGUCUhSSMdcW8buZ4S9p4Vs8cN8TzU0vGafX9C/ypuA08hU/qm5GX5+5M= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1751961031; c=relaxed/simple; bh=DTsBDkj96bXrh8JY1NhkIlAjz4FK+rJghyWRFdTIc7o=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=nEvVwMgMvqnGjWtmD2uPwNJsfRCJwLdtObHt1p6em1bVfrbQiektaZQUe+j3iOM08KVM0KyIx6Co0SNwP7TJzgydKZ3Rdp+0OcljTiz9EA/csR/uaps8qyBbNNad2491ji1anTfRVDdha0+02OAeTwyYGVJ3598iwd9FU03s7i4= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=infradead.org; spf=none smtp.mailfrom=infradead.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b=kTXlUkvJ; arc=none smtp.client-ip=90.155.50.34 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=infradead.org Authentication-Results: smtp.subspace.kernel.org; spf=none smtp.mailfrom=infradead.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="kTXlUkvJ" DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=In-Reply-To:Content-Type:MIME-Version: References:Message-ID:Subject:Cc:To:From:Date:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=DTsBDkj96bXrh8JY1NhkIlAjz4FK+rJghyWRFdTIc7o=; b=kTXlUkvJI91VWOo/DWUJL5udvE KVK5cfwxERjWtMniJ60JZgPmZrL4L5oEGVWKIpPTWQPNE5ArJ5jmTYQ7ZYnw8AB3q46n+sQ+5dfYw Q4SVys6YEcGcys8bNIZ0SBrDt93/ljXv58c64jASkydde/pGEWnDGkck1cIWArvaTDLVE5ZEeTbZK HLP3Hk4i3FpVTujgeFpHyxw+Aujbxr5XpXqzXspRo8hYvpN8EU8ebCpTIC0kqNZ+wi1zn4HSStqB+ 9LXKEb5O1ASsskO+5dvk7WVNfiPBklnI1JhJg9fMfGQmavq3P0cPjfmhIZZi++Iw/Gi7+gwRvKiKu BdICYGGQ==; Received: from 77-249-17-252.cable.dynamic.v4.ziggo.nl ([77.249.17.252] helo=noisy.programming.kicks-ass.net) by casper.infradead.org with esmtpsa (Exim 4.98.2 #2 (Red Hat Linux)) id 1uZ35t-0000000GT95-2BT8; Tue, 08 Jul 2025 07:50:25 +0000 Received: by noisy.programming.kicks-ass.net (Postfix, from userid 1000) id 148EF30065D; Tue, 08 Jul 2025 09:50:25 +0200 (CEST) Date: Tue, 8 Jul 2025 09:50:25 +0200 From: Peter Zijlstra To: Sebastian Andrzej Siewior Cc: linux-kernel@vger.kernel.org, =?iso-8859-1?Q?Andr=E9?= Almeida , Darren Hart , Davidlohr Bueso , Ingo Molnar , Juri Lelli , Thomas Gleixner , Valentin Schneider , Waiman Long Subject: Re: [PATCH 0/3] futex: Use RCU-based per-CPU reference counting Message-ID: <20250708075025.GF1613376@noisy.programming.kicks-ass.net> References: <20250707143623.70325-1-bigeasy@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=us-ascii Content-Disposition: inline In-Reply-To: <20250707143623.70325-1-bigeasy@linutronix.de> On Mon, Jul 07, 2025 at 04:36:20PM +0200, Sebastian Andrzej Siewior wrote: > Since it was not yet released, should we rip out the IMMUTABLE bits and > just stick with GET/SET slots? I suppose that makes sense. If someone ever comes up with another use-case for it we can always add it back in.