Subject: [PATCH] ARM: VExpress: Kconfig: avoid arm6 compatible for ARCH_VEXPRESS

From: [email-masked] (Chen Gang)
Date: Fri, 23 Aug 2013 15:15:33 +0800

On 08/23/2013 03:02 PM, Chen Gang wrote:
> On 08/23/2013 01:51 PM, Tony Lindgren wrote:
>> * Chen Gang <[email-masked]> [130822 20:20]:
>>> 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/Kconfig |    2 +-
>>>  1 files changed, 1 insertions(+), 1 deletions(-)
>>>
>>> diff --git a/arch/arm/mach-vexpress/Kconfig b/arch/arm/mach-vexpress/Kconfig
>>> index 3657954..9b176ce 100644
>>> --- a/arch/arm/mach-vexpress/Kconfig
>>> +++ b/arch/arm/mach-vexpress/Kconfig
>>> @@ -1,5 +1,5 @@
>>>  config ARCH_VEXPRESS
>>> -	bool "ARM Ltd. Versatile Express family" if ARCH_MULTI_V7
>>> +	bool "ARM Ltd. Versatile Express family" if ARCH_MULTI_V7 && !CPU_V6 && !CPU_V6K
>>>  	select ARCH_REQUIRE_GPIOLIB
>>>  	select ARM_AMBA
>>>  	select ARM_GIC
>>
>> We do support v6 and v7 in the same kernel. So instead of limiting
>> what to select in Kconfig, just specify the v7 flags in the Makefile
>> for the vexpress .c file with the inline assembly. Look for the
>> find command I posted earlier in this thread for examples of specifying 
>> flags for a single object in a makefile.
>>
> 
> I guess what your meaning is like the diff below:
> 
> --------------------------------diff begin------------------------------
> 
> diff --git a/arch/arm/mach-vexpress/Makefile b/arch/arm/mach-vexpress/Makefile
> index 36ea824..4ebfda4 100644
> --- a/arch/arm/mach-vexpress/Makefile
> +++ b/arch/arm/mach-vexpress/Makefile
> @@ -2,7 +2,7 @@
>  # Makefile for the linux kernel.
>  #
>  ccflags-$(CONFIG_ARCH_MULTIPLATFORM) := -I$(srctree)/$(src)/include \
> -	-I$(srctree)/arch/arm/plat-versatile/include
> +	-I$(srctree)/arch/arm/plat-versatile/include -march=armv7-a
>  
>  obj-y                                  := v2m.o
>  obj-$(CONFIG_ARCH_VEXPRESS_CA9X4)      += ct-ca9x4.o
> 
> --------------------------------diff end--------------------------------
> 
> If my above guess is correct, it can pass compiling without related
> warnings, but it will be like below (CONFIG_CPU_32v6 is enabled in
> allmodconfig):
> 
>   "... -D__LINUX_ARM_ARCH__=6 -march=armv6k -mtune=arm1136j ...  -march=armv7-a ..."
> 
> Is '-march=armv7-a' conflict with '-D__LINUX_ARM_ARCH__=6' ?
> 

Oh, sorry.

'-D__LINUX_ARM_ARCH__' is for C file, '-march' is for assembly file.
for assembly file (or a C file has inline assemble code), need
'-march=armv7-a' (just like you have already mentioned).

I will send patch v2 for it.

Thanks.

> 
> The related command is :
> 
>   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-
 set-varia
bl
> 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 -march=armv7-a -W     -D"KBUILD_STR(s)=#s" -D"KBUILD_BA
> 
>  
> 
> Thanks.
> 

-- 
Chen Gang