From mboxrd@z Thu Jan 1 00:00:00 1970 From: catalin.marinas@arm.com (Catalin Marinas) Date: Fri, 11 Aug 2017 10:22:14 +0100 Subject: New assembler warnings with binutils 2.29 In-Reply-To: References: Message-ID: <20170811092213.mdmzqtm2lp6ltlxt@armageddon.cambridge.arm.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org 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