linux-kernel - Re: [PATCH 1/2] microblaze: fix endian handling

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Message-ID: <CAK8P3a1zr_9Oy-neCndUgFd1q0pyT07VKbJe2ezw3x6psfut3A@mail.gmail.com>
Date:   Mon, 15 Jan 2018 11:19:54 +0100
From:   Arnd Bergmann <arnd@...db.de>
To:     Michal Simek <monstr@...str.eu>
Cc:     kbuild test robot <lkp@...el.com>, kbuild-all@...org,
        Andrew Morton <akpm@...ux-foundation.org>,
        linux-arch <linux-arch@...r.kernel.org>,
        Babu Moger <babu.moger@...cle.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/2] microblaze: fix endian handling

On Mon, Jan 15, 2018 at 11:14 AM, Michal Simek <monstr@...str.eu> wrote:
> On 15.1.2018 10:29, Arnd Bergmann wrote:
>> On Sun, Jan 14, 2018 at 2:01 AM, kbuild test robot <lkp@...el.com> wrote:
>>> Hi Arnd,
>>>
>>> I love your patch! Yet something to improve:
>>>
>>> [auto build test ERROR on linus/master]
>>> [also build test ERROR on v4.15-rc7 next-20180112]
>>> [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/Arnd-Bergmann/microblaze-fix-endian-handling/20180105-120705
>>> config: microblaze-mmu_defconfig (attached as .config)
>>> compiler: microblaze-linux-gcc (GCC) 7.2.0
>>> reproduce:
>>>         wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
>>>         chmod +x ~/bin/make.cross
>>>         # save the attached .config to linux build tree
>>>         make.cross ARCH=microblaze
>>>
>>> All errors (new ones prefixed by >>):
>>>
>>>>> arch/microblaze/lib/fastcopy.S:33:2: error: #error Microblaze LE not support ASM optimized lib func. Disable OPT_LIB_ASM.
>>>     #error Microblaze LE not support ASM optimized lib func. Disable OPT_LIB_ASM.
>>>      ^~~~~
>>>
>>> vim +33 arch/microblaze/lib/fastcopy.S
>>>
>>
>> This seems to be a result of fixing one bug so we run into one that we didn't
>> get to earlier. I still assume my patch is correct.
>
> I will look at this later this week. Xilinx toolchain which I use
> normally are microblaze for BE or microblazeel that's why proper flags
> are default options already that's why I didn't see any issue.
>
> Did you take toolchain from kernel.org?
> https://www.kernel.org/pub/tools/crosstool/files/bin/x86_64/4.9.0/

I used a gcc-7.2.1 that I built myself for all architectures in order to debug
a gcc issue that appeared in gcc-7.2.

The patch that got tested was my workaround for an obviously broken
allmodconfig build.

         Arnd