linux-kernel - Re: [RFC][PATCH v3 1/5] sparc64: Fix asm/percpu.h build error

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Date:   Fri, 29 May 2020 16:29:17 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     peterz@...radead.org
Cc:     mingo@...nel.org, will@...nel.org, tglx@...utronix.de,
        x86@...nel.org, linux-kernel@...r.kernel.org,
        a.darwish@...utronix.de, rostedt@...dmis.org,
        bigeasy@...utronix.de, sparclinux@...r.kernel.org,
        mpe@...erman.id.au, linuxppc-dev@...ts.ozlabs.org,
        heiko.carstens@...ibm.com, linux-s390@...r.kernel.org
Subject: Re: [RFC][PATCH v3 1/5] sparc64: Fix asm/percpu.h build error

From: Peter Zijlstra <peterz@...radead.org>
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.