linux-kernel - [PATCH 1/2] sparc32,leon: Build with -mcpu=leon3 for SPARC

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Message-Id: <1510668223-18484-2-git-send-email-andreas@gaisler.com>
Date:   Tue, 14 Nov 2017 15:03:42 +0100
From:   Andreas Larsson <andreas@...sler.com>
To:     David Miller <davem@...emloft.net>, sparclinux@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, software@...sler.com
Subject: [PATCH 1/2] sparc32,leon: Build with -mcpu=leon3 for SPARC_LEON

Apart from using LEON3 instruction timing it allows for usage of the
CASA instruction.

Signed-off-by: Andreas Larsson <andreas@...sler.com>
---
 arch/sparc/Makefile | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/arch/sparc/Makefile b/arch/sparc/Makefile
index 8496a07..673ee73 100644
--- a/arch/sparc/Makefile
+++ b/arch/sparc/Makefile
@@ -24,14 +24,20 @@ LDFLAGS        := -m elf32_sparc
 export BITS    := 32
 UTS_MACHINE    := sparc
 
+ifeq ($(CONFIG_SPARC_LEON),y)
+SPARC_MCPU=leon3
+else
+SPARC_MCPU=v8
+endif
+
 # We are adding -Wa,-Av8 to KBUILD_CFLAGS to deal with a specs bug in some
 # versions of gcc.  Some gcc versions won't pass -Av8 to binutils when you
 # give -mcpu=v8.  This silently worked with older bintutils versions but
 # does not any more.
-KBUILD_CFLAGS  += -m32 -mcpu=v8 -pipe -mno-fpu -fcall-used-g5 -fcall-used-g7
+KBUILD_CFLAGS  += -m32 -mcpu=$(SPARC_MCPU) -pipe -mno-fpu -fcall-used-g5 -fcall-used-g7
 KBUILD_CFLAGS  += -Wa,-Av8
 
-KBUILD_AFLAGS  += -m32 -Wa,-Av8
+KBUILD_AFLAGS  += -m32 -mcpu=$(SPARC_MCPU) -Wa,-Av8
 
 else
 #####
-- 
2.8.0