linux-kernel - Re: [kbuild-all] Re: ld.lld: error: inline assembly requires more registers than available at line 523

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Date:   Fri, 6 May 2022 16:18:19 +0800
From:   "Chen, Rong A" <rong.a.chen@...el.com>
To:     Nathan Chancellor <nathan@...nel.org>,
        kernel test robot <lkp@...el.com>
Cc:     Leonardo Bras <leobras@...hat.com>, llvm@...ts.linux.dev,
        kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org,
        Paolo Bonzini <pbonzini@...hat.com>
Subject: Re: [kbuild-all] Re: ld.lld: error: inline assembly requires more
 registers than available at line 523



On 5/5/2022 1:48 AM, Nathan Chancellor wrote:
> On Mon, May 02, 2022 at 06:29:38AM +0800, kernel test robot wrote:
>> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
>> head:   672c0c5173427e6b3e2a9bbb7be51ceeec78093a
>> commit: ba1f77c546966c12d86220d078e5838dcaeab348 x86/kvm: Fix compilation warning in non-x86_64 builds
>> date:   2 months ago
>> config: i386-randconfig-a012-20220502 (https://download.01.org/0day-ci/archive/20220502/202205020637.JVJo3blw-lkp@intel.com/config)
>> compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project 09325d36061e42b495d1f4c7e933e260eac260ed)
>> 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
>>          # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=ba1f77c546966c12d86220d078e5838dcaeab348
>>          git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
>>          git fetch --no-tags linus master
>>          git checkout ba1f77c546966c12d86220d078e5838dcaeab348
>>          # 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=i386 SHELL=/bin/bash
>>
>> If you fix the issue, kindly add following tag as appropriate
>> Reported-by: kernel test robot <lkp@...el.com>
>>
>> All errors (new ones prefixed by >>):
>>
>>>> ld.lld: error: inline assembly requires more registers than available at line 523
>>>> ld.lld: error: inline assembly requires more registers than available at line 523
>>
> 
> I don't think this bisection result is correct; this error is visible at
> v5.17-rc3, which this commit is based on. This is likely the same root
> cause as https://github.com/ClangBuiltLinux/linux/issues/1589, just with
> LTO. I'll reduce something down and comment there if it turns out to be
> different.
> 
> Cheers,
> Nathan

Hi Nathan,

Thanks for your detailed explanation, we have added the error to the
ignore list.

Best Regards,
Rong Chen