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

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Message-ID: <YnK8f7cqMoHxSi0C@dev-arch.thelio-3990X>
Date:   Wed, 4 May 2022 10:48:47 -0700
From:   Nathan Chancellor <nathan@...nel.org>
To:     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: ld.lld: error: inline assembly requires more registers than
 available at line 523

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