From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 9F21FA55 for ; Sun, 15 Mar 2026 22:02:57 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1773612177; cv=none; b=ROZpItuSgd8tJftRQk8A9QeMBXPtehgFYf2JJ1ULpYT8sdpe8H6VBeFMp46R1IqUvQOL7JM1OpxWIEQrWl+5mIE+b4hrfjcLKxtn1VQbh0dhmduh4DJQddWSKjqEMj/m3M41XZko6n96OtxSHuuqvfvHy8LAk28/S00znOhUVNI= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1773612177; c=relaxed/simple; bh=xoNLbFyQXyKwexXEM7eqwB7VzBkA8UkY9RaoUGKw8Sc=; h=Date:Message-ID:From:To:Cc:Subject:In-Reply-To:References: MIME-Version:Content-Type; b=K+MlzI/TCtogSepcWpV2MhSdvyu3+HujVdoVtEX70MHEpXqxtSsTEOWBEGuOM747nsuf6PtcXsxd1xUPk3oxI6CeZbeNv0fIH+nRsUfG5XdDI0CEsomTgPg0SYr9S2mdIpPnTzo1Ob28Fc0X1C9fGTpcatVMSz+sqtKv92yEOT0= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=CZQmZ7Rt; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="CZQmZ7Rt" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 3CA12C4CEF7; Sun, 15 Mar 2026 22:02:57 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1773612177; bh=xoNLbFyQXyKwexXEM7eqwB7VzBkA8UkY9RaoUGKw8Sc=; h=Date:From:To:Cc:Subject:In-Reply-To:References:From; b=CZQmZ7RtuapIc74fVtCqQ9xl7Xl3glkU6sI9dOruPZitiHuuLIIXUi1prgvJbBC3z 8Awk69z0F2IdNClLAx5RsELDjycrHE9LdpIwWZdm4WISPpNU1h1zX8zEdROCaFucsw klsKZVTijTTKZxGd6/gRqhVDANwMTpmvCpic84nbMj641y9vnY0mHLMaOZCnvysPVm CfiW1II7AtBIyh6IWVaJknejOo2BgXL9+1TFzTWYYf/AUMA9chGcVZpLz5xVWgqxua n8Zez96SZd7/29q66ZeVGb1W0sHxNgffWCaJdVUlI/a1sJayq/o9aCPWPbel57LATL MQoEcIggQ13TQ== Received: from sofa.misterjones.org ([185.219.108.64] helo=lobster-girl.misterjones.org) by disco-boy.misterjones.org with esmtpsa (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.98.2) (envelope-from ) id 1w1tXy-00000002ElE-381F; Sun, 15 Mar 2026 22:02:54 +0000 Date: Sun, 15 Mar 2026 22:02:54 +0000 Message-ID: <87h5qgda41.wl-maz@kernel.org> From: Marc Zyngier To: David Laight Cc: Boqun Feng , Catalin Marinas , Ingo Molnar , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Lorenzo Pieralisi , Peter Zijlstra , Thomas Huth , Waiman Long , Will Deacon , Linus Torvalds Subject: Re: osq_lock on arm64 In-Reply-To: <20260315201153.1d2ae1e3@pumpkin> References: <20260315201153.1d2ae1e3@pumpkin> User-Agent: Wanderlust/2.15.9 (Almost Unreal) SEMI-EPG/1.14.7 (Harue) FLIM-LB/1.14.9 (=?UTF-8?B?R29qxY0=?=) APEL-LB/10.8 EasyPG/1.0.0 Emacs/30.1 (aarch64-unknown-linux-gnu) MULE/6.0 (HANACHIRUSATO) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 (generated by SEMI-EPG 1.14.7 - "Harue") Content-Type: text/plain; charset=US-ASCII X-SA-Exim-Connect-IP: 185.219.108.64 X-SA-Exim-Rcpt-To: david.laight.linux@gmail.com, boqun@kernel.org, catalin.marinas@arm.com, mingo@redhat.com, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, lpieralisi@kernel.org, peterz@infradead.org, thuth@redhat.com, longman@redhat.com, will@kernel.org, torvalds@linux-foundation.org X-SA-Exim-Mail-From: maz@kernel.org X-SA-Exim-Scanned: No (on disco-boy.misterjones.org); SAEximRunCond expanded to false On Sun, 15 Mar 2026 20:11:53 +0000, David Laight wrote: [...] > The documentation I found for the arm64 instruction set doesn't mention that > losing the exclusive access requested by ldx will wake wfe, I assume that > is an omission from the docs? R_XRZRK explicitly calls for "The clearing of the global monitor for the PE." as a something that sets the event register, and therefore acts as a wake-up event from WFE. M. -- Jazz isn't dead. It just smells funny.