linux-kernel - Re: arch/riscv/include/asm/jump_label.h:42:3: error: invalid operand for inline asm constraint 'i'

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Date:   Mon, 15 Aug 2022 12:54:54 -0700
From:   Nathan Chancellor <nathan@...nel.org>
To:     kernel test robot <lkp@...el.com>
Cc:     Dao Lu <daolu@...osinc.com>, llvm@...ts.linux.dev,
        kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org,
        Palmer Dabbelt <palmer@...osinc.com>,
        Heiko Stuebner <heiko@...ech.de>
Subject: Re: arch/riscv/include/asm/jump_label.h:42:3: error: invalid operand
 for inline asm constraint 'i'

On Sun, Aug 14, 2022 at 05:10:53PM +0800, kernel test robot wrote:
> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
> head:   aea23e7c464bfdec04b52cf61edb62030e9e0d0a
> commit: 8eb060e10185cfc97ef0200d197ec246ba0f9f8c arch/riscv: add Zihintpause support
> date:   3 days ago
> config: riscv-randconfig-r005-20220814 (https://download.01.org/0day-ci/archive/20220814/202208141746.ABdEd5xo-lkp@intel.com/config)
> compiler: clang version 16.0.0 (https://github.com/llvm/llvm-project 3329cec2f79185bafd678f310fafadba2a8c76d2)
> 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 riscv cross compiling tool for clang build
>         # apt-get install binutils-riscv64-linux-gnu
>         # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=8eb060e10185cfc97ef0200d197ec246ba0f9f8c
>         git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
>         git fetch --no-tags linus master
>         git checkout 8eb060e10185cfc97ef0200d197ec246ba0f9f8c
>         # 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=riscv prepare
> 
> If you fix the issue, kindly add following tag where applicable
> Reported-by: kernel test robot <lkp@...el.com>
> 
> All errors (new ones prefixed by >>):
> 
>    In file included from <built-in>:4:
>    In file included from lib/vdso/gettimeofday.c:5:
>    In file included from include/vdso/datapage.h:17:
>    In file included from include/vdso/processor.h:10:
>    In file included from arch/riscv/include/asm/vdso/processor.h:7:
>    In file included from include/linux/jump_label.h:112:
> >> arch/riscv/include/asm/jump_label.h:42:3: error: invalid operand for inline asm constraint 'i'
>                    "       .option push                            \n\t"
>                    ^
>    1 error generated.
>    make[2]: *** [scripts/Makefile.build:249: arch/riscv/kernel/vdso/vgettimeofday.o] Error 1
>    make[2]: Target 'include/generated/vdso-offsets.h' not remade because of errors.
>    make[1]: *** [arch/riscv/Makefile:128: vdso_prepare] Error 2
>    make[1]: Target 'prepare' not remade because of errors.
>    make: *** [Makefile:219: __sub-make] Error 2
>    make: Target 'prepare' not remade because of errors.

Just for the record, GCC 12.1.0 fails in the same way with the same
configuration (I didn't look into the problem beyond that):

  In file included from <command-line>:
  In function 'arch_static_branch_jump',
      inlined from 'cpu_relax' at arch/riscv/include/asm/vdso/processor.h:13:7:
  include/linux/compiler_types.h:285:33: warning: 'asm' operand 0 probably does not match constraints
    285 | #define asm_volatile_goto(x...) asm goto(x)
        |                                 ^~~
  arch/riscv/include/asm/jump_label.h:41:9: note: in expansion of macro 'asm_volatile_goto'
     41 |         asm_volatile_goto(
        |         ^~~~~~~~~~~~~~~~~
  include/linux/compiler_types.h:285:33: error: impossible constraint in 'asm'
    285 | #define asm_volatile_goto(x...) asm goto(x)
        |                                 ^~~
  arch/riscv/include/asm/jump_label.h:41:9: note: in expansion of macro 'asm_volatile_goto'
     41 |         asm_volatile_goto(
        |         ^~~~~~~~~~~~~~~~~
  make[3]: *** [scripts/Makefile.build:249: arch/riscv/kernel/vdso/vgettimeofday.o] Error 1

Cheers,
Nathan