Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752624AbdHKJWT (ORCPT ); Fri, 11 Aug 2017 05:22:19 -0400 Received: from foss.arm.com ([217.140.101.70]:41798 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751618AbdHKJWS (ORCPT ); Fri, 11 Aug 2017 05:22:18 -0400 Date: Fri, 11 Aug 2017 10:22:14 +0100 From: Catalin Marinas To: Laura Abbott Cc: Will Deacon , Ard Biesheuvel , Arnd Bergmann , Linux Kernel Mailing List , linux-arm-kernel Subject: Re: New assembler warnings with binutils 2.29 Message-ID: <20170811092213.mdmzqtm2lp6ltlxt@armageddon.cambridge.arm.com> References: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: NeoMutt/20170113 (1.7.2) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 848 Lines: 25 On Thu, Aug 10, 2017 at 01:13:22PM -0700, Laura Abbott wrote: > Fedora rawhide recently upgraded to binutils 2.29 and this seems > to produce new warnings: > > ./arch/arm64/include/asm/assembler.h: Assembler messages: > ./arch/arm64/include/asm/assembler.h:125: Warning: ignoring attempt to redefine built-in register 'lr' > > This is > > /* > * Register aliases. > */ > lr .req x30 // link register Strange, does gas now think 'lr' is a general purpose register (aliased to x30)? It never was and IIRC the toolchain people many years ago refused to add it, hence the alias above in the kernel. I wonder if they added 'fp' as well... We could remove the alias and replace all 'lr' instances with 'x30' throughout the kernel (no too many) or we add some #ifdef around the above based on the binutils version. -- Catalin