Messages in this thread | ![/](/images/icornerl.gif) | | From | Alexandre Ghiti <> | Date | Tue, 13 Jun 2023 10:16:54 +0200 | Subject | Re: ld.lld: error: relocation R_RISCV_HI20 cannot be used against symbol 'misaligned_access_speed'; recompile with -fPIC |
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On Sun, Jun 11, 2023 at 2:11 AM kernel test robot <lkp@intel.com> wrote: > > tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master > head: 022ce8862dff83c859089cd14bc4dca0733e2f90 > commit: 8dc2a7e8027fbeca0c7df81d4c82e735a59b5741 riscv: Fix relocatable kernels with early alternatives using -fno-pie > date: 10 days ago > config: riscv-randconfig-r022-20230611 (https://download.01.org/0day-ci/archive/20230611/202306110855.7TlBCIzI-lkp@intel.com/config) > compiler: clang version 16.0.4 (https://github.com/llvm/llvm-project.git ae42196bc493ffe877a7e3dff8be32035dea4d07) > reproduce (this is a W=1 build): > mkdir -p ~/bin > 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=8dc2a7e8027fbeca0c7df81d4c82e735a59b5741 > git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git > git fetch --no-tags linus master > git checkout 8dc2a7e8027fbeca0c7df81d4c82e735a59b5741 > # save the config file > mkdir build_dir && cp config build_dir/.config > COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang ~/bin/make.cross W=1 O=build_dir ARCH=riscv olddefconfig > COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang ~/bin/make.cross W=1 O=build_dir ARCH=riscv SHELL=/bin/bash > > If you fix the issue in a separate patch/commit (i.e. not just a new version of > the same patch/commit), kindly add following tags > | Reported-by: kernel test robot <lkp@intel.com> > | Closes: https://lore.kernel.org/oe-kbuild-all/202306110855.7TlBCIzI-lkp@intel.com/ > > All errors (new ones prefixed by >>): > > >> ld.lld: error: relocation R_RISCV_HI20 cannot be used against symbol 'misaligned_access_speed'; recompile with -fPIC > >>> defined in vmlinux.a(arch/riscv/kernel/cpufeature.o) > >>> referenced by errata.c:42 (arch/riscv/errata/thead/errata.c:42) > >>> arch/riscv/errata/thead/errata.o:(thead_feature_probe_func) in archive vmlinux.a > -- > >> ld.lld: error: relocation R_RISCV_LO12_I cannot be used against symbol 'misaligned_access_speed'; recompile with -fPIC > >>> defined in vmlinux.a(arch/riscv/kernel/cpufeature.o) > >>> referenced by errata.c:42 (arch/riscv/errata/thead/errata.c:42) > >>> arch/riscv/errata/thead/errata.o:(thead_feature_probe_func) in archive vmlinux.a > -- > >> ld.lld: error: relocation R_RISCV_HI20 cannot be used against symbol 'riscv_cbom_block_size'; recompile with -fPIC > >>> defined in vmlinux.a(arch/riscv/mm/cacheflush.o) > >>> referenced by errata.c:42 (arch/riscv/errata/thead/errata.c:42) > >>> arch/riscv/errata/thead/errata.o:(thead_errata_patch_func) in archive vmlinux.a > -- > >> ld.lld: error: relocation R_RISCV_LO12_S cannot be used against symbol 'riscv_cbom_block_size'; recompile with -fPIC > >>> defined in vmlinux.a(arch/riscv/mm/cacheflush.o) > >>> referenced by errata.c:42 (arch/riscv/errata/thead/errata.c:42) > >>> arch/riscv/errata/thead/errata.o:(thead_errata_patch_func) in archive vmlinux.a > -- > >> ld.lld: error: relocation R_RISCV_HI20 cannot be used against symbol '__per_cpu_offset'; recompile with -fPIC > >>> defined in vmlinux.a(mm/percpu.o) > >>> referenced by errata.c:42 (arch/riscv/errata/thead/errata.c:42) > >>> arch/riscv/errata/thead/errata.o:(thead_feature_probe_func) in archive vmlinux.a > -- > >> ld.lld: error: relocation R_RISCV_LO12_I cannot be used against symbol '__per_cpu_offset'; recompile with -fPIC > >>> defined in vmlinux.a(mm/percpu.o) > >>> referenced by errata.c:42 (arch/riscv/errata/thead/errata.c:42) > >>> arch/riscv/errata/thead/errata.o:(thead_feature_probe_func) in archive vmlinux.a >
So I looked into those errors, the config is basically = RELOCATABLE + MEDLOW - EARLY_ALTERNATIVES. Then errata/thead is not compiled as medany, which makes sense since we only need this code to be medany when EARLY_ALTERNATIVES is enabled (because the code would be executed with mmu off, which is not the case here).
I can fix those errors by adding the medany flag, but I'm not sure actually we want to do that since we do not need it and gcc does not complain: any idea?
Alex
> -- > 0-DAY CI Kernel Test Service > https://github.com/intel/lkp-tests/wiki
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