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From:   Olof Johansson <olof@lixom.net>
Date:   Sat, 30 Jun 2018 13:30:11 -0700
Message-ID: <CAOesGMh6yVYKQ+dJbAsJWU=7wrfwW1cBwVbGoKNiG96_Mh6ebA@mail.gmail.com>
Subject: Re: /tmp/cctnQ1CM.s:35: Error: .err encountered
To:     Andrew Morton <akpm@linux-foundation.org>
Cc:     Dmitry Vyukov <dvyukov@google.com>,
        kbuild test robot <lkp@intel.com>, kbuild-all@01.org,
        LKML <linux-kernel@vger.kernel.org>,
        Linux Memory Management List <linux-mm@kvack.org>
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On Sat, Jun 30, 2018 at 11:12 AM, Andrew Morton
<akpm@linux-foundation.org> wrote:
> On Sat, 30 Jun 2018 11:07:20 -0700 Andrew Morton <akpm@linux-foundation.org> wrote:
>
>> On Sat, 30 Jun 2018 12:27:09 +0200 Dmitry Vyukov <dvyukov@google.com> wrote:
>>
>> > > tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
>> > > head:   1904148a361a07fb2d7cba1261d1d2c2f33c8d2e
>> > > commit: 758517202bd2e427664857c9f2aa59da36848aca arm: port KCOV to arm
>> > > date:   2 weeks ago
>> > > config: arm-allmodconfig (attached as .config)
>> > > compiler: arm-linux-gnueabi-gcc (Debian 7.2.0-11) 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
>> > >         git checkout 758517202bd2e427664857c9f2aa59da36848aca
>> > >         # save the attached .config to linux build tree
>> > >         GCC_VERSION=7.2.0 make.cross ARCH=arm
>> > >
>> > > All errors (new ones prefixed by >>):
>> > >
>> > >    /tmp/cctnQ1CM.s: Assembler messages:
>> > >>> /tmp/cctnQ1CM.s:35: Error: .err encountered
>> > >    /tmp/cctnQ1CM.s:36: Error: .err encountered
>> > >    /tmp/cctnQ1CM.s:37: Error: .err encountered
>> >
>> > Hi kbuild test robot,
>> >
>> > The fix was mailed more than a month ago, but still not merged into
>> > the tree. That's linux...
>>
>> That was a rather unhelpful email.
>>
>> I've just scanned all your lkml emails since the start of May and
>> cannot find anything which looks like a fix for this issue.
>>
>> Please resend.   About three weks ago :(
>
> OK, with a bi of amazing sleuthing I found this from Arnd, which is what
> I presume you're referring to?
>
>
>
> From: Arnd Bergmann <arnd@arndb.de>
> Subject: ARM: disable KCOV for trusted foundations code
>
> The ARM trusted foundations code is currently broken in linux-next when
> CONFIG_KCOV_INSTRUMENT_ALL is set:
>
> /tmp/ccHdQsCI.s: Assembler messages:
> /tmp/ccHdQsCI.s:37: Error: .err encountered
> /tmp/ccHdQsCI.s:38: Error: .err encountered
> /tmp/ccHdQsCI.s:39: Error: .err encountered
> scripts/Makefile.build:311: recipe for target 'arch/arm/firmware/trusted_foundations.o' failed
>
> I could not find a function attribute that lets me disable
> -fsanitize-coverage=trace-pc for just one function, so this turns it off
> for the entire file instead.
>
> Link: http://lkml.kernel.org/r/20180529103636.1535457-1-arnd@arndb.de
> Fixes: 758517202bd2e4 ("arm: port KCOV to arm")
> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
> Cc: Dmitry Vyukov <dvyukov@google.com>
> Cc: Mark Rutland <mark.rutland@arm.com>
> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

Solves it on my builder at least. Would be good to get this in.

Acked-by: Olof Johansson <olof@lixom.net>


-Olof