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=-14.6 required=3.0 tests=DKIMWL_WL_MED,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,USER_IN_DEF_DKIM_WL autolearn=unavailable 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 4D847C433E0 for ; Wed, 24 Jun 2020 20:57:42 +0000 (UTC) Received: from mother.openwall.net (mother.openwall.net [195.42.179.200]) by mail.kernel.org (Postfix) with SMTP id 897F72070A for ; Wed, 24 Jun 2020 20:57:41 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="BPMaWjSi" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 897F72070A Authentication-Results: mail.kernel.org; dmarc=fail (p=reject dis=none) header.from=google.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=kernel-hardening-return-19132-kernel-hardening=archiver.kernel.org@lists.openwall.com Received: (qmail 3939 invoked by uid 550); 24 Jun 2020 20:57:36 -0000 Mailing-List: contact kernel-hardening-help@lists.openwall.com; run by ezmlm Precedence: bulk List-Post: List-Help: List-Unsubscribe: List-Subscribe: List-ID: Received: (qmail 3907 invoked from network); 24 Jun 2020 20:57:35 -0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=2UVd4Vpuu4Hnm6XlHGR5cRrZnqXWEFfAzghKkxqA5PE=; b=BPMaWjSiHqVF8vi4hiTlzAVhVpOBnqRB11zTq0lEeedJqVV+du+PNZ4KmaMlIsirPC R928oKYPPNEK406mCXXrFo5ILeh9cKok03PTJz6JfAnRQKQCv1Rh1SMBWeCtT9nOL0oJ lryLagao4wnwA1qFmJ4sPzSNGD7lPYGa8eVmfocCRrLBf+dhWLYjqG85ZdT9LeohIlOb 2EmJnnhlOHrRKj1PGL5sVH9SaXtWzsmYftW61LHVwvnNA7wui7tFGXqcFXutnYBMCItr GdL2Vo1Q7hX8hrKDrgkMAaZk/eo83KbXysC70mpN3P9EzjPp00OuZYiGpwRBnkB00cCL l6nQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=2UVd4Vpuu4Hnm6XlHGR5cRrZnqXWEFfAzghKkxqA5PE=; b=QIPnM7Ah5j83Hlw6Aot7R+i6QUcjzdChNOsxdwYM4TxuOwOQRlHdW/uuI41C1SMveu TNpV480NIHg0uKB30DbvoWUo3ccMBSRZt2T6De/egI7+YlVGYbhDbxeESCI0bnt7jSTM 9SMhElTSojncOnqlwqwqit0wvTErzAhUjAWO2qMTaUOuzfzki1jhElY9GaBCRD0MjmiZ k5JfVOmw11+oyrwb5Wps+pOKU5o1D/AKSp+Tq7CwBaADo1TEak5vFaC3s9fpUHupazTD BHmedoOcD8w0jiwHJrFT+qyKEYmYGOBw+Zwv2+LtedCJZa4cKQJEEtmPDzFBmdxDPKk7 8GgQ== X-Gm-Message-State: AOAM530m52fDauSWPnK0ETvxef9epPl7+UUWGY9AYH/4q5UY6GZanB+h G0tT1XaVb5y9RgvigMKhx/1erFCiWzxuFCl1jMG1/w== X-Google-Smtp-Source: ABdhPJwqdv1zjA72U6Y+yinTpL4jIF0WvT5OjmcvgBRWy2HcW+N17omaHs7u2Al3ueQuo5czHPS48NLDnn5YbwyPtt8= X-Received: by 2002:a63:a119:: with SMTP id b25mr22841048pgf.10.1593032243514; Wed, 24 Jun 2020 13:57:23 -0700 (PDT) MIME-Version: 1.0 References: <20200624203200.78870-1-samitolvanen@google.com> <20200624203200.78870-14-samitolvanen@google.com> In-Reply-To: <20200624203200.78870-14-samitolvanen@google.com> From: Nick Desaulniers Date: Wed, 24 Jun 2020 13:57:11 -0700 Message-ID: Subject: Re: [PATCH 13/22] scripts/mod: disable LTO for empty.c To: Sami Tolvanen Cc: Masahiro Yamada , Will Deacon , Greg Kroah-Hartman , "Paul E. McKenney" , Kees Cook , clang-built-linux , Kernel Hardening , linux-arch , Linux ARM , Linux Kbuild mailing list , LKML , linux-pci@vger.kernel.org, "maintainer:X86 ARCHITECTURE (32-BIT AND 64-BIT)" Content-Type: text/plain; charset="UTF-8" On Wed, Jun 24, 2020 at 1:33 PM Sami Tolvanen wrote: > > With CONFIG_LTO_CLANG, clang generates LLVM IR instead of ELF object > files. As empty.o is used for probing target properties, disable LTO > for it to produce an object file instead. > > Signed-off-by: Sami Tolvanen Reviewed-by: Nick Desaulniers > --- > scripts/mod/Makefile | 1 + > 1 file changed, 1 insertion(+) > > diff --git a/scripts/mod/Makefile b/scripts/mod/Makefile > index 296b6a3878b2..b6e3b40c6eeb 100644 > --- a/scripts/mod/Makefile > +++ b/scripts/mod/Makefile > @@ -1,5 +1,6 @@ > # SPDX-License-Identifier: GPL-2.0 > OBJECT_FILES_NON_STANDARD := y > +CFLAGS_REMOVE_empty.o += $(CC_FLAGS_LTO) > > hostprogs := modpost mk_elfconfig > always-y := $(hostprogs) empty.o > -- > 2.27.0.212.ge8ba1cc988-goog > -- Thanks, ~Nick Desaulniers