linux-kernel - Re: [PATCH 1/2] powerpc/64: Set default CPU in Kconfig

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Message-ID: <a0805df4-ebc3-0478-b9dd-0bd1f9d23b82@csgroup.eu>
Date:   Fri, 3 Feb 2023 18:22:08 +0000
From:   Christophe Leroy <christophe.leroy@...roup.eu>
To:     Pali Rohár <pali@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>
CC:     Naresh Kamboju <naresh.kamboju@...aro.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>,
        "mpe@...erman.id.au" <mpe@...erman.id.au>,
        "npiggin@...il.com" <npiggin@...il.com>,
        "arnd@...db.de" <arnd@...db.de>,
        "anders.roxell@...aro.org" <anders.roxell@...aro.org>,
        "llvm@...ts.linux.dev" <llvm@...ts.linux.dev>,
        "nathan@...nel.org" <nathan@...nel.org>,
        Linux Kernel Functional Testing <lkft@...aro.org>,
        "qiongsiwu@...il.com" <qiongsiwu@...il.com>,
        "nemanja.i.ibm@...il.com" <nemanja.i.ibm@...il.com>
Subject: Re: [PATCH 1/2] powerpc/64: Set default CPU in Kconfig



Le 03/02/2023 à 18:58, Pali Rohár a écrit :
> On Wednesday 01 February 2023 09:29:45 Nick Desaulniers wrote:
>> On Wed, Feb 1, 2023 at 3:41 AM Christophe Leroy
>> <christophe.leroy@...roup.eu> wrote:
>>>
>>>
>>>
>>> Le 01/02/2023 à 12:31, Naresh Kamboju a écrit :
>>>> Following build regression started from next-20230131.
>>>>
>>>> Regressions found on powerpc:
>>>>
>>>>     build/clang-nightly-tqm8xx_defconfig
>>>>     build/clang-nightly-ppc64e_defconfig
>>>>
>>>>
>>>> make --silent --keep-going --jobs=8 O=/home/tuxbuild/.cache/tuxmake/builds/1/build ARCH=powerpc CROSS_COMPILE=powerpc64le-linux-gnu- HOSTCC=clang CC=clang LLVM=1 LLVM_IAS=0 tqm8xx_defconfig
>>>> make --silent --keep-going --jobs=8 O=/home/tuxbuild/.cache/tuxmake/builds/1/build ARCH=powerpc CROSS_COMPILE=powerpc64le-linux-gnu- HOSTCC=clang CC=clang LLVM=1 LLVM_IAS=0
>>>>
>>>> error: unknown target CPU '860'
>>>> note: valid target CPU values are: generic, 440, 450, 601, 602, 603, 603e, 603ev, 604, 604e, 620, 630, g3, 7400, g4, 7450, g4+, 750, 8548, 970, g5, a2, e500, e500mc, e5500, power3, pwr3, power4, pwr4, power5, pwr5, power5x, pwr5x, power6, pwr6, power6x, pwr6x, power7, pwr7, power8, pwr8, power9, pwr9, power10, pwr10, powerpc, ppc, ppc32, powerpc64, ppc64, powerpc64le, ppc64le, future
>>>> make[2]: *** [/builds/linux/scripts/Makefile.build:114: scripts/mod/devicetable-offsets.s] Error 1
>>>> error: unknown target CPU '860'
>>>> note: valid target CPU values are: generic, 440, 450, 601, 602, 603, 603e, 603ev, 604, 604e, 620, 630, g3, 7400, g4, 7450, g4+, 750, 8548, 970, g5, a2, e500, e500mc, e5500, power3, pwr3, power4, pwr4, power5, pwr5, power5x, pwr5x, power6, pwr6, power6x, pwr6x, power7, pwr7, power8, pwr8, power9, pwr9, power10, pwr10, powerpc, ppc, ppc32, powerpc64, ppc64, powerpc64le, ppc64le, future
>>>> make[2]: *** [/builds/linux/scripts/Makefile.build:252: scripts/mod/empty.o] Error 1
>>>
>>>
>>> On GCC, the possible values are:
>>>
>>> ppc-linux-gcc: note : valid arguments to ‘-mcpu=’ are: 401 403 405 405fp
>>> 440 440fp 464 464fp 476 476fp 505 601 602 603 603e 604 604e 620 630 740
>>> 7400 7450 750 801 821 823 8540 8548 860 970 G3 G4 G5 a2 cell e300c2
>>> e300c3 e500mc e500mc64 e5500 e6500 ec603e native power3 power4 power5
>>> power5+ power6 power6x power7 power8 powerpc powerpc64 powerpc64le rs64
>>> titan
>>>
>>> How do you tell CLANG that you are building for powerpc 8xx ?
> 
> Maybe llvm does not have support for this old CPU core at all? Because
> from 'note: valid target CPU values are:' message it looks like that.

By the way I submitted a patch to opt out of CLANG until we clarify the 
situation, see 
https://patchwork.ozlabs.org/project/linuxppc-dev/patch/e62892e32c14a7a5738c597e39e0082cb0abf21c.1675335659.git.christophe.leroy@csgroup.eu/

Christophe

> 
>> + Nemanjai, Qiongsi,
>>
>>
>>>
>>>>
>>>>
>>>> Reported-by: Linux Kernel Functional Testing <lkft@...aro.org>
>>>>
>>>> https://qa-reports.linaro.org/lkft/linux-next-master/build/next-20230201/testrun/14479384/suite/build/test/clang-nightly-tqm8xx_defconfig/history/
>>>>
>>>> The bisection pointed to this commit,
>>>>     45f7091aac35 ("powerpc/64: Set default CPU in Kconfig")
>>>>
>>>> --
>>>> Linaro LKFT
>>>> https://lkft.linaro.org
>>
>>
>>
>> -- 
>> Thanks,
>> ~Nick Desaulniers