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=-11.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, MENTIONS_GIT_HOSTING,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, USER_AGENT_GIT autolearn=ham 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 B3B87C433E1 for ; Tue, 16 Jun 2020 16:05:10 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 98A73208B3 for ; Tue, 16 Jun 2020 16:05:10 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1592323510; bh=cR0PP+/MQZYLqQf3bbJfXoLuvhvnjpmt6Okx0cKiyf4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=foQ6yGq/uIbSMkKCdy7Qeauv9iPDwCemhM0O/5N1n4OAPjhXwXJIc2yQCPcNv1o8S giPzjhrRYpqmcayabYptVxm41xtMpz/vLqtyRybVgbprZ4iy7ELb/XTKCwQMGGfpF6 bls+31OJj0zQn0cOAUEOsORV8qxGd0p3TRRQ37K8= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729794AbgFPQFJ (ORCPT ); Tue, 16 Jun 2020 12:05:09 -0400 Received: from mail.kernel.org ([198.145.29.99]:44044 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1732473AbgFPPtM (ORCPT ); Tue, 16 Jun 2020 11:49:12 -0400 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id C2F1F2071A; Tue, 16 Jun 2020 15:49:11 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1592322552; bh=cR0PP+/MQZYLqQf3bbJfXoLuvhvnjpmt6Okx0cKiyf4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=ugzR4CCo6RiDW7hayB/yjARNCvFGaFMe8YkxepG4xMJGHEyWq8KiKIxER1s335Iy/ mpuxje/ygGgOdt8pPBpkompgBZnpdOl0OPQrZlWphe0b8l65MFRYoAwN6u6Vt4/fdQ KBFHQvS2o1oNCh1/ABqhskzS2NzKdmv/c5itCu1E= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Nick Desaulniers , Andrew Morton , Nathan Chancellor , Fangrui Song , Jeremy Fitzhardinge , Thomas Gleixner , Vincenzo Frascino , Linus Torvalds , Jian Cai , Ilie Halip Subject: [PATCH 5.6 013/161] elfnote: mark all .note sections SHF_ALLOC Date: Tue, 16 Jun 2020 17:33:23 +0200 Message-Id: <20200616153107.043647293@linuxfoundation.org> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20200616153106.402291280@linuxfoundation.org> References: <20200616153106.402291280@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Nick Desaulniers commit 51da9dfb7f20911ae4e79e9b412a9c2d4c373d4b upstream. ELFNOTE_START allows callers to specify flags for .pushsection assembler directives. All callsites but ELF_NOTE use "a" for SHF_ALLOC. For vdso's that explicitly use ELF_NOTE_START and BUILD_SALT, the same section is specified twice after preprocessing, once with "a" flag, once without. Example: .pushsection .note.Linux, "a", @note ; .pushsection .note.Linux, "", @note ; While GNU as allows this ordering, it warns for the opposite ordering, making these directives position dependent. We'd prefer not to precisely match this behavior in Clang's integrated assembler. Instead, the non __ASSEMBLY__ definition of ELF_NOTE uses __attribute__((section(".note.Linux"))) which is created with SHF_ALLOC, so let's make the __ASSEMBLY__ definition of ELF_NOTE consistent with C and just always use "a" flag. This allows Clang to assemble a working mainline (5.6) kernel via: $ make CC=clang AS=clang Signed-off-by: Nick Desaulniers Signed-off-by: Andrew Morton Reviewed-by: Nathan Chancellor Reviewed-by: Fangrui Song Cc: Jeremy Fitzhardinge Cc: Thomas Gleixner Cc: Vincenzo Frascino Link: https://github.com/ClangBuiltLinux/linux/issues/913 Link: http://lkml.kernel.org/r/20200325231250.99205-1-ndesaulniers@google.com Debugged-by: Ilie Halip Signed-off-by: Linus Torvalds Cc: Jian Cai Signed-off-by: Greg Kroah-Hartman --- include/linux/elfnote.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/include/linux/elfnote.h +++ b/include/linux/elfnote.h @@ -54,7 +54,7 @@ .popsection ; #define ELFNOTE(name, type, desc) \ - ELFNOTE_START(name, type, "") \ + ELFNOTE_START(name, type, "a") \ desc ; \ ELFNOTE_END