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Message-Id: <C6A730FC-C7B5-4A32-92CD-98FDA632782C@flygoat.com>
Date: Thu, 20 Apr 2023 00:41:50 +0100
From: Jiaxun Yang <jiaxun.yang@...goat.com>
To: Nathan Chancellor <nathan@...nel.org>
Cc: Borislav Petkov <bp@...en8.de>, kernel test robot <lkp@...el.com>,
Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
llvm@...ts.linux.dev, oe-kbuild-all@...ts.linux.dev,
linux-kernel@...r.kernel.org
Subject: Re: arch/mips/include/asm/timex.h:75:10: error: instruction requires
a CPU feature not currently enabled
> 2023年4月20日 00:18，Nathan Chancellor <nathan@...nel.org> 写道：
>
> + Jiaxun, who has been looking into MIPS + LLVM issues recently and has
> been a big help :)
I think this patch[1] may fix the problem.
Thanks
- Jiaxun
[1]: https://patchwork.kernel.org/project/linux-mips/patch/20230411111225.55725-2-jiaxun.yang@flygoat.com/
>
> On Thu, Apr 20, 2023 at 12:37:07AM +0200, Borislav Petkov wrote:
>> + Thomas.
>>
>> On Mon, Apr 17, 2023 at 07:57:04AM +0800, kernel test robot wrote:
>>> tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
>>> head: 6a8f57ae2eb07ab39a6f0ccad60c760743051026
>>> commit: aba5b397cad7d398b385aaf5029f99f41b690466 hamradio: baycom_epp: Do not use x86-specific rdtsc()
>>> date: 4 months ago
>>> config: mips-buildonly-randconfig-r001-20230417 (https://download.01.org/0day-ci/archive/20230417/202304170748.Fg9VIgGd-lkp@intel.com/config)
>>> compiler: clang version 17.0.0 (https://github.com/llvm/llvm-project 9638da200e00bd069e6dd63604e14cbafede9324)
>>
>> Where do I get clang 17?
>
> I think they intend for you to get it via their make.cross script but
> this issue reproduces with clang 16.0.2 from
> https://mirrors.edge.kernel.org/pub/tools/llvm/ for me locally.
>
>> In any case, this
>>
>> "error: instruction requires a CPU feature not currently enabled"
>>
>> sounds like clang is trying to generate invalid code for the wrong
>> target. .config issue?
>
> I am far from a MIPS expert but this usually means that there is some
> assembler directive that we are missing to allow access to certain
> instructions in newer ISA versions than the one specified via '-march'.
> I have no idea if that is the case here or not but I do see the correct
> target flags when building with V=1, so it is not something obvious like
> that. I can double back to this later this week or next week if nobody
> else is able to.
>
> Regardless, this seems like a pre-existing issue that was just exposed
> by your patch, not the root cause of it.
>
> Cheers,
> Nathan
>
>>> reproduce (this is a W=1 build):
>>> wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
>>> chmod +x ~/bin/make.cross
>>> # install mips cross compiling tool for clang build
>>> # apt-get install binutils-mipsel-linux-gnu
>>> # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=aba5b397cad7d398b385aaf5029f99f41b690466
>>> git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
>>> git fetch --no-tags linus master
>>> git checkout aba5b397cad7d398b385aaf5029f99f41b690466
>>> # save the config file
>>> mkdir build_dir && cp config build_dir/.config
>>> COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=mips olddefconfig
>>> COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=mips SHELL=/bin/bash drivers/net/hamradio/
>>>
>>> If you fix the issue, kindly add following tag where applicable
>>> | Reported-by: kernel test robot <lkp@...el.com>
>>> | Link: https://lore.kernel.org/oe-kbuild-all/202304170748.Fg9VIgGd-lkp@intel.com/
>>>
>>> All errors (new ones prefixed by >>):
>>>
>>> In file included from drivers/net/hamradio/baycom_epp.c:29:
>>> In file included from include/linux/module.h:13:
>>> In file included from include/linux/stat.h:19:
>>> In file included from include/linux/time.h:60:
>>> In file included from include/linux/time32.h:13:
>>> In file included from include/linux/timex.h:67:
>>>>> arch/mips/include/asm/timex.h:75:10: error: instruction requires a CPU feature not currently enabled
>>> return read_c0_count();
>>> ^
>>> arch/mips/include/asm/mipsregs.h:1712:26: note: expanded from macro 'read_c0_count'
>>> #define read_c0_count() __read_32bit_c0_register($9, 0)
>>> ^
>>> arch/mips/include/asm/mipsregs.h:1453:2: note: expanded from macro '__read_32bit_c0_register'
>>> ___read_32bit_c0_register(source, sel, __volatile__)
>>> ^
>>> arch/mips/include/asm/mipsregs.h:1419:4: note: expanded from macro '___read_32bit_c0_register'
>>> "mfc0\t%0, " #source "\n\t" \
>>> ^
>>> <inline asm>:1:2: note: instantiated into assembly here
>>> mfc0 $4, $9
>>> ^
>>> In file included from drivers/net/hamradio/baycom_epp.c:29:
>>> In file included from include/linux/module.h:13:
>>> In file included from include/linux/stat.h:19:
>>> In file included from include/linux/time.h:60:
>>> In file included from include/linux/time32.h:13:
>>> In file included from include/linux/timex.h:67:
>>>>> arch/mips/include/asm/timex.h:75:10: error: instruction requires a CPU feature not currently enabled
>>> return read_c0_count();
>>> ^
>>> arch/mips/include/asm/mipsregs.h:1712:26: note: expanded from macro 'read_c0_count'
>>> #define read_c0_count() __read_32bit_c0_register($9, 0)
>>> ^
>>> arch/mips/include/asm/mipsregs.h:1453:2: note: expanded from macro '__read_32bit_c0_register'
>>> ___read_32bit_c0_register(source, sel, __volatile__)
>>> ^
>>> arch/mips/include/asm/mipsregs.h:1419:4: note: expanded from macro '___read_32bit_c0_register'
>>> "mfc0\t%0, " #source "\n\t" \
>>> ^
>>> <inline asm>:1:2: note: instantiated into assembly here
>>> mfc0 $2, $9
>>> ^
>>> In file included from drivers/net/hamradio/baycom_epp.c:29:
>>> In file included from include/linux/module.h:13:
>>> In file included from include/linux/stat.h:19:
>>> In file included from include/linux/time.h:60:
>>> In file included from include/linux/time32.h:13:
>>> In file included from include/linux/timex.h:67:
>>>>> arch/mips/include/asm/timex.h:75:10: error: instruction requires a CPU feature not currently enabled
>>> return read_c0_count();
>>> ^
>>> arch/mips/include/asm/mipsregs.h:1712:26: note: expanded from macro 'read_c0_count'
>>> #define read_c0_count() __read_32bit_c0_register($9, 0)
>>> ^
>>> arch/mips/include/asm/mipsregs.h:1453:2: note: expanded from macro '__read_32bit_c0_register'
>>> ___read_32bit_c0_register(source, sel, __volatile__)
>>> ^
>>> arch/mips/include/asm/mipsregs.h:1419:4: note: expanded from macro '___read_32bit_c0_register'
>>> "mfc0\t%0, " #source "\n\t" \
>>> ^
>>> <inline asm>:1:2: note: instantiated into assembly here
>>> mfc0 $2, $9
>>> ^
>>> In file included from drivers/net/hamradio/baycom_epp.c:29:
>>> In file included from include/linux/module.h:13:
>>> In file included from include/linux/stat.h:19:
>>> In file included from include/linux/time.h:60:
>>> In file included from include/linux/time32.h:13:
>>> In file included from include/linux/timex.h:67:
>>>>> arch/mips/include/asm/timex.h:75:10: error: instruction requires a CPU feature not currently enabled
>>> return read_c0_count();
>>> ^
>>> arch/mips/include/asm/mipsregs.h:1712:26: note: expanded from macro 'read_c0_count'
>>> #define read_c0_count() __read_32bit_c0_register($9, 0)
>>> ^
>>> arch/mips/include/asm/mipsregs.h:1453:2: note: expanded from macro '__read_32bit_c0_register'
>>> ___read_32bit_c0_register(source, sel, __volatile__)
>>> ^
>>> arch/mips/include/asm/mipsregs.h:1419:4: note: expanded from macro '___read_32bit_c0_register'
>>> "mfc0\t%0, " #source "\n\t" \
>>> ^
>>> <inline asm>:1:2: note: instantiated into assembly here
>>> mfc0 $2, $9
>>> ^
>>> 4 errors generated.
>>>
>>>
>>> vim +75 arch/mips/include/asm/timex.h
>>>
>>> 9c9b415c50bc29 Ralf Baechle 2013-09-12 71
>>> 06947aaaf9bf7d Maciej W. Rozycki 2014-04-06 72 static inline cycles_t get_cycles(void)
>>> 06947aaaf9bf7d Maciej W. Rozycki 2014-04-06 73 {
>>> 06947aaaf9bf7d Maciej W. Rozycki 2014-04-06 74 if (can_use_mips_counter(read_c0_prid()))
>>> 9c9b415c50bc29 Ralf Baechle 2013-09-12 @75 return read_c0_count();
>>> 06947aaaf9bf7d Maciej W. Rozycki 2014-04-06 76 else
>>> 06947aaaf9bf7d Maciej W. Rozycki 2014-04-06 77 return 0; /* no usable counter */
>>> 9c9b415c50bc29 Ralf Baechle 2013-09-12 78 }
>>> 1c99c6a7c3c599 Jason A. Donenfeld 2022-04-08 79 #define get_cycles get_cycles
>>> 9c9b415c50bc29 Ralf Baechle 2013-09-12 80
>>>
>>> :::::: The code at line 75 was first introduced by commit
>>> :::::: 9c9b415c50bc298ac61412dff856eae2f54889ee MIPS: Reimplement get_cycles().
>>>
>>> :::::: TO: Ralf Baechle <ralf@...ux-mips.org>
>>> :::::: CC: Ralf Baechle <ralf@...ux-mips.org>
>>>
>>> --
>>> 0-DAY CI Kernel Test Service
>>> https://github.com/intel/lkp-tests
>>
>> --
>> Regards/Gruss,
>> Boris.
>>
>> https://people.kernel.org/tglx/notes-about-netiquette
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