linux-kernel - Re: [PATCH v3 20/25] ARM: owl: Implement CPU enable-method for S500

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Message-ID: <1e196fc4-bc4c-5c81-7662-c76e2bc5f8d9@suse.de>
Date:   Sat, 4 Mar 2017 00:00:55 +0100
From:   Andreas Färber <afaerber@...e.de>
To:     linux-arm-kernel@...ts.infradead.org
Cc:     kbuild test robot <lkp@...el.com>, kbuild-all@...org,
        arm@...nel.org, mp-cs@...ions-semi.com, 96boards@...obotics.com,
        support@...aker.org, linux-kernel@...r.kernel.org,
        Russell King <linux@...linux.org.uk>
Subject: Re: [PATCH v3 20/25] ARM: owl: Implement CPU enable-method for S500

Am 01.03.2017 um 11:40 schrieb Andreas Färber:
> Am 01.03.2017 um 08:19 schrieb kbuild test robot:
>> Hi Andreas,
>>
>> [auto build test ERROR on next-20170228]
>> [also build test ERROR on v4.10]
>> [cannot apply to robh/for-next linus/master linux/master v4.9-rc8 v4.9-rc7 v4.9-rc6]
>> [if your patch is applied to the wrong git tree, please drop us a note to help improve the system]
>>
>> url:    https://github.com/0day-ci/linux/commits/Andreas-F-rber/ARM-Initial-Actions-Semi-S500-and-S900-enablement/20170301-110028
>> config: arm-allmodconfig (attached as .config)
>> compiler: arm-linux-gnueabi-gcc (Debian 6.1.1-9) 6.1.1 20160705
>> reproduce:
>>         wget https://git.kernel.org/cgit/linux/kernel/git/wfg/lkp-tests.git/plain/sbin/make.cross -O ~/bin/make.cross
>>         chmod +x ~/bin/make.cross
>>         # save the attached .config to linux build tree
>>         make.cross ARCH=arm 
>>
>> All errors (new ones prefixed by >>):
>>
>>    arch/arm/mach-actions/headsmp.S: Assembler messages:
>>>> arch/arm/mach-actions/headsmp.S:43: Error: selected processor does not support `dsb' in ARM mode
>>>> arch/arm/mach-actions/headsmp.S:44: Error: selected processor does not support `isb' in ARM mode
>>
>> vim +43 arch/arm/mach-actions/headsmp.S
>>
>>     37		mov	r6, r2, lsl r0
>>     38		orr	r5, r5, r6	@ Reg = (Temp<<WayShift)|(NumSets<<SetShift)
>>     39		mcr	p15, 0, r5, c7, c6, 2
>>     40		bgt	2b
>>     41		cmp	r2, #0
>>     42		bgt	1b
>>   > 43		dsb
>>   > 44		isb
> 
> Any suggestion what to do about this error? Obviously it built fine for
> me, and the only thing I spotted in the attached config was that it's
> apparently a BE8 build...

And it has V6 enabled. If I set

AFLAGS_headsmp.o := -Wa,-march=armv7-a

then the error seems resolved.

Regards,
Andreas

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