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 E9657C61DA4 for ; Thu, 23 Feb 2023 08:27:16 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233552AbjBWI1P (ORCPT ); Thu, 23 Feb 2023 03:27:15 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:52636 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232923AbjBWI1O (ORCPT ); Thu, 23 Feb 2023 03:27:14 -0500 Received: from casper.infradead.org (casper.infradead.org [IPv6:2001:8b0:10b:1236::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 6A1024AFD5 for ; Thu, 23 Feb 2023 00:27:13 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=MIME-Version:Content-Type:References: In-Reply-To:Date:Cc:To:From:Subject:Message-ID:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=s7Umo5/tacE0xYWC3Rv6yWoUU2xxnOUXYCVq32Pif04=; b=EgMy4QzTdc+NZYum0G/uwlFKkj HBG0uWQ/egY14XYoF5sFOolnzDbPDbVwwOOUIUSkZOLeuM6vUTIYXT7T47oO91x2tvn6ibH5u1om4 8UYLJHRQld9f0DeCI5muuvt8lPF4ElgkCF1mV52l1Bf5tH/D2iD869b62+DPJvFvxppXlU/LFZ/Ju PqlDWBOqr2z1pRzYgJQPrYw0DKoxaLLU1J/S5lkIQGj/BaPv6vYDE64aMon7v+ohXRgiQeEfbxT5k E4tazvLIirGtpK3pUqQFDqFmpXRN1zD3mrXA0b2Xtyg/P6XsCXWB5s/VCLRkAzdIb24rmouxZD7gD bV1+vj0Q==; Received: from [2001:8b0:10b:5::bb3] (helo=u3832b3a9db3152.ant.amazon.com) by casper.infradead.org with esmtpsa (Exim 4.94.2 #2 (Red Hat Linux)) id 1pV6wW-00ECNm-Rf; Thu, 23 Feb 2023 08:27:09 +0000 Message-ID: Subject: Re: [PATCH 3/6] x86/smpboot: Remove initial_stack on 64-bit From: David Woodhouse To: Brian Gerst , linux-kernel@vger.kernel.org, x86@kernel.org Cc: Usama Arif , Thomas Gleixner , Borislav Petkov , "H . Peter Anvin" , Peter Zijlstra , Andy Lutomirski , Ingo Molnar Date: Thu, 23 Feb 2023 08:27:07 +0000 In-Reply-To: References: <20230222221301.245890-1-brgerst@gmail.com> <20230222221301.245890-4-brgerst@gmail.com> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-SjZD0OcetVdQLQnyrnv2" User-Agent: Evolution 3.44.4-0ubuntu1 MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org --=-SjZD0OcetVdQLQnyrnv2 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Thu, 2023-02-23 at 08:05 +0000, David Woodhouse wrote: >=20 >=20 > Aren't all CPUs taking this .Linit_cpu0_data path for non-parallel > startup, not just cpu0? I think you want something more like >=20 > .Linit_cpuN_data: > orl $0x0fffffff, %edx > leaq __per_cpu_offset(%rip), %rbx > movq (%rbx,%rdx,8), %rdx > jmp .Lsetup_cpu > =C2=A0 Er, nope. Forget that. 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