Received: by 2002:a05:6358:d09b:b0:dc:cd0c:909e with SMTP id jc27csp2546725rwb; Thu, 17 Nov 2022 12:21:09 -0800 (PST) X-Google-Smtp-Source: AA0mqf4b49mbztXYM15DQPcIrldzct1Kswd/m6rsg4BdA1SxB3J+8sP2bWWfpjYA7V0sCSgae1i4 X-Received: by 2002:a05:6a00:338c:b0:56b:a319:7b52 with SMTP id cm12-20020a056a00338c00b0056ba3197b52mr4546257pfb.21.1668716469565; Thu, 17 Nov 2022 12:21:09 -0800 (PST) ARC-Seal: i=1; a=rsa-sha256; t=1668716469; cv=none; d=google.com; s=arc-20160816; b=fB0wMSapCKOvgBB6J3etQFwXwHjEuMQpJu07HZyqQ5OYXLouLOVnv84xl+QnYXUdxi xmpjtJ6v2zxGRID+t0jb6BGd1/tBvquU6zaWFUxWRhT73dPAurHY3qHvKH7w3idBzZRf aCOzYT/YALSuTQlRYduJTnxepKjgZ/SVK/vNCtrwIaX2w0+z9F/dJorSzM8tM6dfORTR gtAePZDKHX409JM12wkcgHz/oH6TgjhVYAVn3/a2HwE/fCxpnmUpOICC/KKcomCWQIFE Sh/4c82eNu7pQTh0QutRGtG3ys7kO37DN3UGNVqAN38rUT+XyfxrSrMppubtln4XaBPz dKig== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:cc:to:subject:message-id:date:from:in-reply-to :references:mime-version:dkim-signature; bh=vO+cKwGnnt7Ikp4K63ZOyB2XNYmenlQEdQ2QOJjZGLs=; b=loTMI4brdfjwI8kI9oTQ2TTwt+2Vaj+Rb6JVINLad7WKtdG3R72uEICLyMtiaV/Vg1 fuN3FZgSx4YfIVeGZ0tqxx/5qOjy7IM/obXGAHpKE+uHYlLRdojJd52UYgA3PUnOqAvu rck/TecKlvUYzz97zRhC/gNX9oYwcHcMibSUpWrZ3YV31MSucxmIwhnSCcKUUoWEF0Tq Gnjn3+nfNaxGdTaRq+Z04TT93RCmSK+Fhg1s/b5vdMOKZxMZ7eFmRRJevS/04PGh4lP3 m1dUwaw54wZ8NQarwNnia04RC5EVETX8FZcW+tdhkYVTjeqeXr/a/nrGxA/DSNLuHoX4 zEjA== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@kernel.org header.s=k20201202 header.b="qBYjZa/I"; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=kernel.org Return-Path: Received: from out1.vger.email (out1.vger.email. [2620:137:e000::1:20]) by mx.google.com with ESMTP id f14-20020aa7968e000000b0056c2a741b03si1594269pfk.81.2022.11.17.12.20.56; Thu, 17 Nov 2022 12:21:09 -0800 (PST) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20; Authentication-Results: mx.google.com; dkim=pass header.i=@kernel.org header.s=k20201202 header.b="qBYjZa/I"; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234380AbiKQUAU (ORCPT + 92 others); Thu, 17 Nov 2022 15:00:20 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:50324 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234246AbiKQUAT (ORCPT ); Thu, 17 Nov 2022 15:00:19 -0500 Received: from dfw.source.kernel.org (dfw.source.kernel.org [IPv6:2604:1380:4641:c500::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 6C5117EC9C; Thu, 17 Nov 2022 12:00:18 -0800 (PST) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 0F3A96205B; Thu, 17 Nov 2022 20:00:18 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 722D9C433C1; Thu, 17 Nov 2022 20:00:17 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1668715217; bh=vO+cKwGnnt7Ikp4K63ZOyB2XNYmenlQEdQ2QOJjZGLs=; h=References:In-Reply-To:From:Date:Subject:To:Cc:From; b=qBYjZa/IMlM5KHeE09wABdhBZYEwPpjSjJIewLnsQOK2jagLXDzJKNAC+8P0TGMXB aHGKpChuj12Gwa7Bf4xXECgPo8xYZys0D7zAFVnUYPqyq+GfMzHbgUY7AL5WMud7Ig ACvYjH5wAkDAYx2409RaAYKs88aLxCkw0dL02JMhF2v4T2hV5Mrj94QELuDjvy9BoI UcJe8WHHheCZtWrkr0AHL9Y2RctZqIuX2fvaCpTrLGZFvSN7olSLrkR+FcOV1IFu0V RkuT9dRd8U1xbpV8pu7/ya50NWOGz3iRdQzSLENEj0ITSYTyZkF5BQfoeKTx/R7D/U DSTTSk6NLM3xQ== Received: by mail-ej1-f52.google.com with SMTP id t25so7795802ejb.8; Thu, 17 Nov 2022 12:00:17 -0800 (PST) X-Gm-Message-State: ANoB5pktOUx3aYSim57QAhG8Asd4qyqns6vuS9rw2x+7LzrDI+2YO3K6 KZ6EagFccW8GTIHZCjISBKMEq+rbejbpvUHO8eg= X-Received: by 2002:a17:906:2645:b0:781:d0c1:4434 with SMTP id i5-20020a170906264500b00781d0c14434mr3379349ejc.756.1668715215682; Thu, 17 Nov 2022 12:00:15 -0800 (PST) MIME-Version: 1.0 References: <20221114114344.18650-1-jirislaby@kernel.org> <20221114114344.18650-41-jirislaby@kernel.org> In-Reply-To: <20221114114344.18650-41-jirislaby@kernel.org> From: Song Liu Date: Thu, 17 Nov 2022 12:00:03 -0800 X-Gmail-Original-Message-ID: Message-ID: Subject: Re: [PATCH 40/46] x86/livepatch, lto: Disable live patching with gcc LTO To: "Jiri Slaby (SUSE)" Cc: linux-kernel@vger.kernel.org, Andi Kleen , Josh Poimboeuf , Jiri Kosina , Miroslav Benes , Petr Mladek , Joe Lawrence , live-patching@vger.kernel.org, Andi Kleen , Martin Liska , Jiri Slaby Content-Type: text/plain; charset="UTF-8" X-Spam-Status: No, score=-7.1 required=5.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_HI, SPF_HELO_NONE,SPF_PASS autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, Nov 14, 2022 at 3:48 AM Jiri Slaby (SUSE) wrote: > > From: Andi Kleen > > It is not supported by gcc 12 so far, so it causes compiler "sorry" > messages. > > Other than the compiler support, there shouldn't be any barriers for > live patching LTOed kernels, although it might be more difficult to > create patches for larger functions. A loosely related question: does livepatch work with CLANG LTO? AFAICT, kpatch-build doesn't support it. But the kernel side should work just fine? Thanks, Song [...]