From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id E1D36C64EC7 for ; Mon, 13 Feb 2023 20:54:15 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230094AbjBMUyO (ORCPT ); Mon, 13 Feb 2023 15:54:14 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:46218 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229953AbjBMUyM (ORCPT ); Mon, 13 Feb 2023 15:54:12 -0500 Received: from desiato.infradead.org (desiato.infradead.org [IPv6:2001:8b0:10b:1:d65d:64ff:fe57:4e05]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 72B9920069; Mon, 13 Feb 2023 12:54:10 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=desiato.20200630; h=Content-Transfer-Encoding:Content-Type :MIME-Version:Message-ID:References:In-Reply-To:Subject:CC:To:From:Date: Sender:Reply-To:Content-ID:Content-Description; bh=L9Lp70nKi81urUNH/P20ez0LtfS+viLTxmxtWz3Dtp0=; b=H3t89eeMooGlhIz6hiBQXvjRQQ dM2XLF1imB62BLLyF8ysJ5H2Bvmj3Txr0wpFPF/Kg8ztcRrLp5+eltRMS6YlUMl2fcGctmmYeOBAm e6L5Ll90FgfvtPBTG/g9tGx/uaK3RXQCcb9winjrAKvpF3Jy3sqn0NQQEpD2r0moOXEV0qGLlYnhX pwEMhOBgf6RJPoTIV8Np7OZ08kLySOEFenh9NKCnmX4XN2FB42dSWblW2wmm7Es3U00Ge5KOfM3R5 ZBRhQsbg667/r6P/Yc8dxHpj8Blv7VOEBY/UAZZTSbb7F0Bes4alcGflAcxHi/8HPHMWgefRKOrlv xStaFbEg==; Received: from [2001:871:43:561d:2d56:2cf3:ed22:ad26] (helo=[IPv6:::1]) by desiato.infradead.org with esmtpsa (Exim 4.96 #2 (Red Hat Linux)) id 1pRfoT-009SDs-00; Mon, 13 Feb 2023 20:52:37 +0000 Date: Mon, 13 Feb 2023 21:53:15 +0100 From: David Woodhouse To: Thomas Gleixner , Usama Arif , kim.phillips@amd.com CC: arjan@linux.intel.com, mingo@redhat.com, bp@alien8.de, dave.hansen@linux.intel.com, hpa@zytor.com, x86@kernel.org, pbonzini@redhat.com, paulmck@kernel.org, linux-kernel@vger.kernel.org, kvm@vger.kernel.org, rcu@vger.kernel.org, mimoja@mimoja.de, hewenliang4@huawei.com, thomas.lendacky@amd.com, seanjc@google.com, pmenzel@molgen.mpg.de, fam.zheng@bytedance.com, punit.agrawal@bytedance.com, simon.evans@bytedance.com, liangma@liangbit.com, David Woodhouse Subject: =?US-ASCII?Q?Re=3A_=5BPATCH_v8_9/9=5D_x86/smpboot=3A_Serializ?= =?US-ASCII?Q?e_topology_updates_for_secondary_bringup?= User-Agent: K-9 Mail for Android In-Reply-To: <87v8k5s3dq.ffs@tglx> References: <20230209154156.266385-1-usama.arif@bytedance.com> <20230209154156.266385-10-usama.arif@bytedance.com> <87v8k5s3dq.ffs@tglx> Message-ID: MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable X-SRS-Rewrite: SMTP reverse-path rewritten from by desiato.infradead.org. See http://www.infradead.org/rpr.html Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 13 February 2023 21:43:13 CET, Thomas Gleixner w= rote: >On Thu, Feb 09 2023 at 15:41, Usama Arif wrote: >> From: David Woodhouse >> >> The toplogy update is performed by the AP via smp_callin() after the BS= P >> has called do_wait_cpu_initialized(), setting the AP's bit in >> cpu_callout_mask to allow it to proceed=2E >> >> In preparation to enable further parallelism of AP bringup, add locking= to >> serialize the update even if multiple APs are (in future) permitted to >> proceed through the next stages of bringup in parallel=2E > >This one is also only relevant for further parallelisation, right? I believe so, yes=2E But it's low-hanging fruit and might as well go in no= w=2E