linux-kernel - Re: drivers/iommu/io-pgtable-arm.c:330:8: error: instruction requires the following: RV64I Base Instruction Set

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Date:   Fri, 17 Feb 2023 10:07:31 +0100
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     kernel test robot <lkp@...el.com>
Cc:     Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>,
        llvm@...ts.linux.dev, oe-kbuild-all@...ts.linux.dev,
        linux-kernel@...r.kernel.org,
        Conor Dooley <conor.dooley@...rochip.com>,
        Guo Ren <guoren@...nel.org>,
        linux-riscv <linux-riscv@...ts.infradead.org>
Subject: Re: drivers/iommu/io-pgtable-arm.c:330:8: error: instruction requires
 the following: RV64I Base Instruction Set

CC linux-riscv

On Fri, Feb 17, 2023 at 4:50 AM kernel test robot <lkp@...el.com> wrote:
> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
> head:   3ac88fa4605ec98e545fb3ad0154f575fda2de5f
> commit: 8292493c22c8e28b6e67a01e0f5c6db1cf231eb1 riscv: Kconfig.socs: Add ARCH_RENESAS kconfig option
> date:   3 months ago
> config: riscv-buildonly-randconfig-r003-20230216 (https://download.01.org/0day-ci/archive/20230217/202302171144.sffQigLX-lkp@intel.com/config)
> compiler: clang version 17.0.0 (https://github.com/llvm/llvm-project db89896bbbd2251fff457699635acbbedeead27f)
> 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-riscv-linux-gnu
>         # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=8292493c22c8e28b6e67a01e0f5c6db1cf231eb1
>         git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
>         git fetch --no-tags linus master
>         git checkout 8292493c22c8e28b6e67a01e0f5c6db1cf231eb1
>         # save the config file
>         mkdir build_dir && cp config build_dir/.config
>         COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=riscv olddefconfig
>         COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=riscv SHELL=/bin/bash drivers/iommu/
>
> 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/202302171144.sffQigLX-lkp@intel.com/
>
> All errors (new ones prefixed by >>):
>
> >> drivers/iommu/io-pgtable-arm.c:330:8: error: instruction requires the following: RV64I Base Instruction Set
>            old = cmpxchg64_relaxed(ptep, curr, new);
>                  ^
>    include/linux/atomic/atomic-instrumented.h:1968:2: note: expanded from macro 'cmpxchg64_relaxed'
>            arch_cmpxchg64_relaxed(__ai_ptr, __VA_ARGS__); \
>            ^
>    include/linux/atomic/atomic-arch-fallback.h:60:32: note: expanded from macro 'arch_cmpxchg64_relaxed'
>    #define arch_cmpxchg64_relaxed arch_cmpxchg64
>                                   ^
>    arch/riscv/include/asm/cmpxchg.h:354:2: note: expanded from macro 'arch_cmpxchg64'
>            arch_cmpxchg((ptr), (o), (n));                                  \
>            ^
>    arch/riscv/include/asm/cmpxchg.h:344:23: note: expanded from macro 'arch_cmpxchg'
>            (__typeof__(*(ptr))) __cmpxchg((ptr),                           \
>                                 ^
>    arch/riscv/include/asm/cmpxchg.h:324:4: note: expanded from macro '__cmpxchg'
>                            "0:     lr.d %0, %2\n"                          \
>                            ^
>    <inline asm>:1:5: note: instantiated into assembly here
>            0:      lr.d s4, 0(s0)
>                    ^

This is a bug in arch/riscv/include/asm/cmpxchg.h, which doesn't
cater for the CONFIG_32BIT=y case.

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds