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 X-Spam-Level: X-Spam-Status: No, score=-6.0 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id DADA0C2B9F4 for ; Mon, 14 Jun 2021 23:10:00 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id C262561246 for ; Mon, 14 Jun 2021 23:10:00 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229829AbhFNXMD (ORCPT ); Mon, 14 Jun 2021 19:12:03 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:57756 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229760AbhFNXMC (ORCPT ); Mon, 14 Jun 2021 19:12:02 -0400 Received: from mail-pg1-x532.google.com (mail-pg1-x532.google.com [IPv6:2607:f8b0:4864:20::532]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 1382DC061574 for ; Mon, 14 Jun 2021 16:09:48 -0700 (PDT) Received: by mail-pg1-x532.google.com with SMTP id v7so1157035pgl.2 for ; Mon, 14 Jun 2021 16:09:47 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=chromium.org; s=google; h=date:from:to:cc:subject:message-id:references:mime-version :content-disposition:in-reply-to; bh=Xjx68w65fQQOZjwsL4rBc5IndNejAizyHVHEks/ULIk=; b=ZbzriAM5GRBcaZCLWRylOqMA4kOgmnflpB61TfCq//LMxzYKJ5sYbUwSxFbozU47K8 IT9h+H9O/zqcuZHRyMQhGlcasyiN+KQxvi+kbCRWDyn41F/SGXiBhVYSKMU2Ksa01TXa NA8sf5OTKxC4fg7QrnGUTXYeub+oQBx8WD1dI= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:cc:subject:message-id:references :mime-version:content-disposition:in-reply-to; bh=Xjx68w65fQQOZjwsL4rBc5IndNejAizyHVHEks/ULIk=; b=EVttnLJQVhIsG9NQh68CNGghApiKohZIwiy5qFZUcDthrTZNj7nuZMAeBRc7l+iUtU q8/YSeGScwUMuO1+cLp85IR1U8ifJIwdRzzTaws7X7kGw3HxibiAIZtFXz7AtHGxGCf6 8yrZE/WR8aTfRvInPYZ6C5uT8l02XVlnZBDYEtJrUmqInZ58cnd+1zhGwQ/dxW9wBXxh 6vJuIhqQENFCqT8hbiWvQYEIJvRX8ZLJcRZgcc3LRBrPoAmScKlWKPOL9CpWGZyab7Lo zkkv9aouWPp88+LZcrrCA+D2HIybEps2vcxW3TVdh7jxVZMm7K3AdLPcFT7Mc/oONnru uu8w== X-Gm-Message-State: AOAM531fFEBaNFub2NakePsaMXtCMSYjeu/wDRDwds1tyOfEEQOznGSD mVMFGwnOLPbWvEL62zwVMeUMdQ== X-Google-Smtp-Source: ABdhPJwP/LUViaDtZ9HJNdb0UB4GShVFMWDa7L9q+z3JSG7Mw9KnsuMRLFmRCbI6fAFYr22ue64Dvw== X-Received: by 2002:a62:53c1:0:b029:2ef:25e8:d9e5 with SMTP id h184-20020a6253c10000b02902ef25e8d9e5mr1526062pfb.74.1623712187446; Mon, 14 Jun 2021 16:09:47 -0700 (PDT) Received: from www.outflux.net (smtp.outflux.net. [198.145.64.163]) by smtp.gmail.com with ESMTPSA id z205sm13535380pfc.165.2021.06.14.16.09.46 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 14 Jun 2021 16:09:46 -0700 (PDT) Date: Mon, 14 Jun 2021 16:09:45 -0700 From: Kees Cook To: Lecopzer Chen Cc: masahiroy@kernel.org, michal.lkml@markovi.net, nathan@kernel.org, ndesaulniers@google.com, samitolvanen@google.com, linux-kbuild@vger.kernel.org, clang-built-linux@googlegroups.com, linux-kernel@vger.kernel.org, yj.chiang@mediatek.com Subject: Re: [PATCH] kbuild: lto: fix module versionings mismatch in incremental build Message-ID: <202106141554.A2D26986A@keescook> References: <20210614055109.28774-1-lecopzer.chen@mediatek.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20210614055109.28774-1-lecopzer.chen@mediatek.com> Precedence: bulk List-ID: X-Mailing-List: linux-kbuild@vger.kernel.org On Mon, Jun 14, 2021 at 01:51:09PM +0800, Lecopzer Chen wrote: > When building modules(CONFIG_...=m), I found some of module versions > are incorrect and set to 0. > This can be found in build log for first clean build which shows > > WARNING: EXPORT symbol "XXXX" [drivers/XXX/XXX.ko] version generation failed, symbol will not be versioned. I'm doing this, and I don't see the problem: $ make LLVM=1 LLVM_IAS=1 distclean $ make LLVM=1 LLVM_IAS=1 menuconfig *enable LTO* *enable a module* $ make LLVM=1 LLVM_IAS=1 -j... What series of commands (and .config) shows this for you? -- Kees Cook