Subject: [PATCH v2] ARM: VExpress: Makefile: add armv7 flags for inline assmembly code compiling

From: [email-masked] (Chen Gang)
Date: Fri, 23 Aug 2013 16:02:40 +0800

When vexpress kernel is compiled for v6, it still can support armv7
instructions (hardware still support), so need let compiler know about
it for related inline assembly code, or compiling will fail.

The related failure command:

  arm-linux-gnueabi-gcc -Wp,-MD,arch/arm/mach-vexpress/.dcscb.o.d  -nostdinc -isystem /usr/lib/gcc/arm-linux-gnueabi/4.7/include -I/root/linux-next/arch/arm/include -Iarch/arm/include/generated  -Iinclude -I/root/linux-next/arch/arm/include/uapi -Iarch/arm/include/generated/uapi -I/root/linux-next/include/uapi -Iinclude/generated/uapi -include /root/linux-next/include/linux/kconfig.h -D__KERNEL__ -mlittle-endian -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs -fno-strict-aliasing -fno-common -Werror-implicit-function-declaration -Wno-format-security -fno-delete-null-pointer-checks -Werror=implicit-int -Werror=strict-prototypes -Os -Wno-maybe-uninitialized -fno-dwarf2-cfi-asm -fno-omit-frame-pointer -mapcs -mno-sched-prolog -fstack-protector -mabi=aapcs-linux -mno-thumb-interwork -funwind-tables -marm -D__LINUX_ARM_ARCH__=6 -march=armv6k -mtune=arm1136j-s -msoft-float -Uarm -fno-reorder-blocks -fno-ipa-cp-clone -fno-partial-inlining -Wframe-larger-than=1024 -Wno-unused-but-se
 t-variabl
e -fno-omit-frame-pointer -fno-optimize-sibling-calls -g -femit-struct-debug-baseonly -fno-var-tracking -pg -fno-inline-functions-called-once -Wdeclaration-after-statement -Wno-pointer-sign -fno-strict-overflow -fconserve-stack -DCC_HAVE_ASM_GOTO -I/root/linux-next/arch/arm/mach-vexpress/include -I/root/linux-next/arch/arm/plat-versatile/include -W     -D"KBUILD_STR(s)=#s" -D"KBUILD_BASENAME=KBUILD_STR(dcscb)"  -D"KBUILD_MODNAME=KBUILD_STR(dcscb)" -c -o arch/arm/mach-vexpress/.tmp_dcscb.o arch/arm/mach-vexpress/dcscb.c

The related error:

  /tmp/ccOMIprI.s: Assembler messages:
  /tmp/ccOMIprI.s:507: Error: selected processor does not support ARM mode `isb '
  /tmp/ccOMIprI.s:513: Error: selected processor does not support ARM mode `isb '
  /tmp/ccOMIprI.s:514: Error: selected processor does not support ARM mode `dsb '
  /tmp/ccOMIprI.s:584: Error: selected processor does not support ARM mode `isb '
  /tmp/ccOMIprI.s:590: Error: selected processor does not support ARM mode `isb '
  /tmp/ccOMIprI.s:591: Error: selected processor does not support ARM mode `dsb '
  make[1]: *** [arch/arm/mach-vexpress/dcscb.o] Error 1
  make: *** [arch/arm/mach-vexpress] Error 2

Signed-off-by: Chen Gang <[email-masked]>
---
 arch/arm/mach-vexpress/Makefile |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)

diff --git a/arch/arm/mach-vexpress/Makefile b/arch/arm/mach-vexpress/Makefile
index 36ea824..f224577 100644
--- a/arch/arm/mach-vexpress/Makefile
+++ b/arch/arm/mach-vexpress/Makefile
@@ -10,3 +10,6 @@ obj-$(CONFIG_ARCH_VEXPRESS_DCSCB)	+= dcscb.o	dcscb_setup.o
 obj-$(CONFIG_ARCH_VEXPRESS_TC2_PM)	+= tc2_pm.o spc.o
 obj-$(CONFIG_SMP)			+= platsmp.o
 obj-$(CONFIG_HOTPLUG_CPU)		+= hotplug.o
+
+CFLAGS_dcscb.o				+=-march=armv7-a
+CFLAGS_tc2_pm.o				+=-march=armv7-a
-- 
1.7.7.6