From nobody Fri Oct 31 03:42:49 2025 Delivered-To: importer@patchew.org Received-SPF: pass (zohomail.com: domain of lists.xenproject.org designates 192.237.175.120 as permitted sender) client-ip=192.237.175.120; envelope-from=xen-devel-bounces@lists.xenproject.org; helo=lists.xenproject.org; Authentication-Results: mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of lists.xenproject.org designates 192.237.175.120 as permitted sender) smtp.mailfrom=xen-devel-bounces@lists.xenproject.org; dmarc=pass(p=quarantine dis=none) header.from=suse.com ARC-Seal: i=1; a=rsa-sha256; t=1750235364; cv=none; d=zohomail.com; s=zohoarc; b=eh2Yx2y56pcxxOT79BK/8rbw8bZI/9UT4SbOwrj2kB7SRQkzSkR5iniAv/D5QqxYZ95Lrlg2Qpi6R5EJKcw4hQ3J+hvshQutCdB9IOGiLBQZDGs8wPrIgaQJb4b4SqmJh+kk8ldaV9/47kU3HkJf7VpBUas5dIZh5sdhKWvhCQc= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1750235364; h=Content-Type:Content-Transfer-Encoding:Cc:Cc:Date:Date:From:From:List-Subscribe:List-Post:List-Id:List-Help:List-Unsubscribe:MIME-Version:Message-ID:Sender:Subject:Subject:To:To:Message-Id:Reply-To; bh=xpxvw8i+JRCZShJeI1r+FrzPafAxEdWvg0TDgLnUWD0=; b=TUg2OzX9IWFoe+15ACDg17nC25aLx3e81piwEcRxHIOLiaxx43Etbb2CrPeoKr6jrAX3mm4QYoTE94FJtXzQ2syIyEzUNY2X/FhGjoaXHZL/ecouDT163mmMgT8mW5uqkEq+8ggMxoLs3SwiMJrhnLkhdLjWol0QXtfc2sXZ6dM= ARC-Authentication-Results: i=1; mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of lists.xenproject.org designates 192.237.175.120 as permitted sender) smtp.mailfrom=xen-devel-bounces@lists.xenproject.org; dmarc=pass header.from= (p=quarantine dis=none) Return-Path: Received: from lists.xenproject.org (lists.xenproject.org [192.237.175.120]) by mx.zohomail.com with SMTPS id 17502353647071010.3792428847571; Wed, 18 Jun 2025 01:29:24 -0700 (PDT) Received: from list by lists.xenproject.org with outflank-mailman.1018971.1395846 (Exim 4.92) (envelope-from ) id 1uRoAD-00062a-Cc; Wed, 18 Jun 2025 08:28:57 +0000 Received: by outflank-mailman (output) from mailman id 1018971.1395846; Wed, 18 Jun 2025 08:28:57 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1uRoAD-00062T-9k; Wed, 18 Jun 2025 08:28:57 +0000 Received: by outflank-mailman (input) for mailman id 1018971; Wed, 18 Jun 2025 08:28:55 +0000 Received: from se1-gles-sth1-in.inumbo.com ([159.253.27.254] helo=se1-gles-sth1.inumbo.com) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1uRoAB-00062N-To for xen-devel@lists.xenproject.org; Wed, 18 Jun 2025 08:28:55 +0000 Received: from mail-ed1-x52c.google.com (mail-ed1-x52c.google.com [2a00:1450:4864:20::52c]) by se1-gles-sth1.inumbo.com (Halon) with ESMTPS id 4463e883-4c1e-11f0-a30a-13f23c93f187; Wed, 18 Jun 2025 10:28:54 +0200 (CEST) Received: by mail-ed1-x52c.google.com with SMTP id 4fb4d7f45d1cf-60780d74c85so10100435a12.2 for ; Wed, 18 Jun 2025 01:28:53 -0700 (PDT) Received: from [10.156.60.236] (ip-037-024-206-209.um08.pools.vodafone-ip.de. [37.24.206.209]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-2365e0cffffsm93944795ad.248.2025.06.18.01.22.37 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 18 Jun 2025 01:22:41 -0700 (PDT) X-Outflank-Mailman: Message body and most headers restored to incoming version X-BeenThere: xen-devel@lists.xenproject.org List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-devel-bounces@lists.xenproject.org Precedence: list Sender: "Xen-devel" X-Inumbo-ID: 4463e883-4c1e-11f0-a30a-13f23c93f187 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=google; t=1750235332; x=1750840132; darn=lists.xenproject.org; h=content-transfer-encoding:autocrypt:subject:from:cc:to :content-language:user-agent:mime-version:date:message-id:from:to:cc :subject:date:message-id:reply-to; bh=xpxvw8i+JRCZShJeI1r+FrzPafAxEdWvg0TDgLnUWD0=; b=CrwqbWJwizWAyMRn/PzSw0kZeEsect12tHjwUpBXW9Y3uYCcp7UME1N264VLoAbbbU gVVBsMgQikZ/qRruOB2VRNt7LsZjZkXGyrbbKrJ60T+XsKOX6bH7t0W52aOMFNRewmPF PAejzH5fCo7l/lcXLpxzoD0MiWf9INmsG568h94JbsxGThACWLcYo+ScpVEoqS9ir4cl 2pbqUsPNKzpFmaGBAaq+k6I/7OCiQAqjREA4xIKiUYvkEPlLwrGhYW5dG4vAE+DUS3rI YYImPJ4CBH5/GgSl2k2RBA2kXpQ8BaVqAcaF+ksqU8Z+d6qG6iiKPdhuOvNhv/bSJWsF nGhQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1750235332; x=1750840132; h=content-transfer-encoding:autocrypt:subject:from:cc:to :content-language:user-agent:mime-version:date:message-id :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=xpxvw8i+JRCZShJeI1r+FrzPafAxEdWvg0TDgLnUWD0=; b=LhIYeXu4O0xzWk00NpvDndREx7esbgBI1TPPg/3ClzMdoyjCL2V7RWcE/hjPByppt8 Nq1tkpsM5vPcKzg72438tHY52x8SP96m4fyTMqfly84RvKDu4Qx3+dQG9PWso3zG97+g 0LbKdSGRT9xX8sSH223mdoI+rNMZsmRrIeT80mVTBnXAMm3g4Ny/GpuIZW6/KJRUyP/F b4EJBc+1KImRUeqiYR4uVvIHX8515P3b/iJAS4IYndfORXTVqiJX0VCyCe8U899VnWs1 8rOOfAHGQ4jqbNNDxtl1jSaFJOep24db1GEi81f+P77jbMF0hvMA/T05ALUrDUgJMKHV GWYQ== X-Gm-Message-State: AOJu0Yznta/wc5yXQaFNhlXobdJv4jxWyrf2yBWtgIroWEwPP168oAjJ Zk7uyrrhRMC6H/cIqiRJO7PD7Vx29E4EfdowdIHNonSy7eAyrN9+mrQ9M/yqFkVM3p2LF3iuwIh BL/0= X-Gm-Gg: ASbGncueYdNrUpHYseG0mifgZoz8TvTLuGGXA/pPAb58qe4yLDoQxaXYUbuyOIW6v1G bcpi8s3HHNZxWXbAyVWWCWeC4WZh8zipF+VIqqQmKGBlZcYHgE9xJ99h/O62INRgtseA/b6ODn/ dVjfuQLb9mLVist7GiteRe0gEbkCORfqrBi4yt3ZA9j4DkclhhBLzQ64d6LZzNLoBB/7nhixiON XPl1hpPCJenSGR6zP5J7X7rjZL8uXj5FdLqr3wwpr5t0LfCr5d3tpKe1bm3fVXX3LeFknsYXiS9 2otZMjJSrUjAkwI6WC9OCj1biy+TSyOcfyQ9d4iBihiNGO/DqhVx0GDMwbpiD4Jg445JSSM7C52 l4qrtdEbZJftwKA339IkXq6L+8uz1wNfpv4GcvNm05wv26ZetMGAZaVZD6Q== X-Google-Smtp-Source: AGHT+IH3AZ2OPnAfPra3LUaK/1dD6GEEVvepeivu8b7/ZzQci5mAFN6jhgJmYgFwnbVBx5yKtY1BlA== X-Received: by 2002:a5d:64ce:0:b0:3a4:f513:7f03 with SMTP id ffacd0b85a97d-3a572e8bfb1mr12246224f8f.44.1750234962175; Wed, 18 Jun 2025 01:22:42 -0700 (PDT) Message-ID: Date: Wed, 18 Jun 2025 10:22:33 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Content-Language: en-US To: "xen-devel@lists.xenproject.org" Cc: Andrew Cooper , Julien Grall , Stefano Stabellini , Anthony PERARD , Michal Orzel , =?UTF-8?Q?Roger_Pau_Monn=C3=A9?= From: Jan Beulich Subject: [PATCH] xen/build: pass -fzero-init-padding-bits=all to gcc15 Autocrypt: addr=jbeulich@suse.com; keydata= xsDiBFk3nEQRBADAEaSw6zC/EJkiwGPXbWtPxl2xCdSoeepS07jW8UgcHNurfHvUzogEq5xk hu507c3BarVjyWCJOylMNR98Yd8VqD9UfmX0Hb8/BrA+Hl6/DB/eqGptrf4BSRwcZQM32aZK 7Pj2XbGWIUrZrd70x1eAP9QE3P79Y2oLrsCgbZJfEwCgvz9JjGmQqQkRiTVzlZVCJYcyGGsD /0tbFCzD2h20ahe8rC1gbb3K3qk+LpBtvjBu1RY9drYk0NymiGbJWZgab6t1jM7sk2vuf0Py O9Hf9XBmK0uE9IgMaiCpc32XV9oASz6UJebwkX+zF2jG5I1BfnO9g7KlotcA/v5ClMjgo6Gl MDY4HxoSRu3i1cqqSDtVlt+AOVBJBACrZcnHAUSuCXBPy0jOlBhxPqRWv6ND4c9PH1xjQ3NP nxJuMBS8rnNg22uyfAgmBKNLpLgAGVRMZGaGoJObGf72s6TeIqKJo/LtggAS9qAUiuKVnygo 3wjfkS9A3DRO+SpU7JqWdsveeIQyeyEJ/8PTowmSQLakF+3fote9ybzd880fSmFuIEJldWxp Y2ggPGpiZXVsaWNoQHN1c2UuY29tPsJgBBMRAgAgBQJZN5xEAhsDBgsJCAcDAgQVAggDBBYC AwECHgECF4AACgkQoDSui/t3IH4J+wCfQ5jHdEjCRHj23O/5ttg9r9OIruwAn3103WUITZee e7Sbg12UgcQ5lv7SzsFNBFk3nEQQCACCuTjCjFOUdi5Nm244F+78kLghRcin/awv+IrTcIWF hUpSs1Y91iQQ7KItirz5uwCPlwejSJDQJLIS+QtJHaXDXeV6NI0Uef1hP20+y8qydDiVkv6l IreXjTb7DvksRgJNvCkWtYnlS3mYvQ9NzS9PhyALWbXnH6sIJd2O9lKS1Mrfq+y0IXCP10eS FFGg+Av3IQeFatkJAyju0PPthyTqxSI4lZYuJVPknzgaeuJv/2NccrPvmeDg6Coe7ZIeQ8Yj t0ARxu2xytAkkLCel1Lz1WLmwLstV30g80nkgZf/wr+/BXJW/oIvRlonUkxv+IbBM3dX2OV8 AmRv1ySWPTP7AAMFB/9PQK/VtlNUJvg8GXj9ootzrteGfVZVVT4XBJkfwBcpC/XcPzldjv+3 HYudvpdNK3lLujXeA5fLOH+Z/G9WBc5pFVSMocI71I8bT8lIAzreg0WvkWg5V2WZsUMlnDL9 mpwIGFhlbM3gfDMs7MPMu8YQRFVdUvtSpaAs8OFfGQ0ia3LGZcjA6Ik2+xcqscEJzNH+qh8V m5jjp28yZgaqTaRbg3M/+MTbMpicpZuqF4rnB0AQD12/3BNWDR6bmh+EkYSMcEIpQmBM51qM EKYTQGybRCjpnKHGOxG0rfFY1085mBDZCH5Kx0cl0HVJuQKC+dV2ZY5AqjcKwAxpE75MLFkr wkkEGBECAAkFAlk3nEQCGwwACgkQoDSui/t3IH7nnwCfcJWUDUFKdCsBH/E5d+0ZnMQi+G0A nAuWpQkjM1ASeQwSHEeAWPgskBQL Content-Transfer-Encoding: quoted-printable X-ZohoMail-DKIM: pass (identity @suse.com) X-ZM-MESSAGEID: 1750235367177116600 Content-Type: text/plain; charset="utf-8" See the respective bullet point in the Caveats section of https://gcc.gnu.org/gcc-15/changes.html. While I'm unaware of us currently relying on the pre-gcc15 behavior, let's still play safe and retain what unknowingly we may have been relying upon. According to my observations, on x86 generated code changes - somewhere deep in modify_bars(), presumably from the struct map_data initializer in apply_map() (a new MOVQ), - in vpci_process_pending(), apparently again from the struct map_data initializer (and again a new MOVQ), - near the top of find_cpio_data(), presumably from the struct cpio_data initializer (a MOVW changing to a MOVQ). Requested-by: Andrew Cooper Signed-off-by: Jan Beulich Acked-by: Andrew Cooper --- apply_map() being inlined is kind of against our intentions, seeing that it's marked __init. Should we add noinline there? After all post-init this is effectively unreachable code, which Misra opposes to. --- a/xen/Makefile +++ b/xen/Makefile @@ -396,6 +396,7 @@ endif CFLAGS-$(CONFIG_CC_SPLIT_SECTIONS) +=3D -ffunction-sections -fdata-sections =20 CFLAGS +=3D -nostdinc -fno-builtin -fno-common +$(call cc-option-add,CFLAGS,CC,-fzero-init-padding-bits=3Dall) CFLAGS +=3D -Werror -Wredundant-decls -Wwrite-strings -Wno-pointer-arith CFLAGS +=3D -Wdeclaration-after-statement -Wuninitialized $(call cc-option-add,CFLAGS,CC,-Wvla)