From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Date: Fri, 29 May 2020 16:29:17 -0700 (PDT) Message-Id: <20200529.162917.1970892823680223252.davem@davemloft.net> Subject: Re: [RFC][PATCH v3 1/5] sparc64: Fix asm/percpu.h build error From: David Miller In-Reply-To: <20200529214203.673108357@infradead.org> References: <20200529213550.683440625@infradead.org> <20200529214203.673108357@infradead.org> Mime-Version: 1.0 Content-Type: Text/Plain; charset=us-ascii Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: To: peterz@infradead.org Cc: mingo@kernel.org, will@kernel.org, tglx@linutronix.de, x86@kernel.org, linux-kernel@vger.kernel.org, a.darwish@linutronix.de, rostedt@goodmis.org, bigeasy@linutronix.de, sparclinux@vger.kernel.org, mpe@ellerman.id.au, linuxppc-dev@lists.ozlabs.org, heiko.carstens@de.ibm.com, linux-s390@vger.kernel.org From: Peter Zijlstra Date: Fri, 29 May 2020 23:35:51 +0200 > ../arch/sparc/include/asm/percpu_64.h:7:24: warning: call-clobbered register used for global register variable > register unsigned long __local_per_cpu_offset asm("g5"); The "-ffixed-g5" option on the command line tells gcc that we are using 'g5' as a fixed register, so some part of your build isn't using the: KBUILD_CFLAGS += -ffixed-g4 -ffixed-g5 -fcall-used-g7 -Wno-sign-compare from arch/sparc/Makefile for some reason.