ld.lld: error: unknown argument '--ppc476-workaround'

ld.lld: error: unknown argument '--ppc476-workaround'

[kernel test robot]

Hi Randy,

FYI, the error/warning was bisected to this commit, please ignore it if it's irrelevant.

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   457391b0380335d5e9a5babdec90ac53928b23b4
commit: 5ba3747dbc9ade2d22a8f5bff3c928cb41d35030 regulator: bd71815: add select to fix build
date:   1 year, 11 months ago
config: powerpc-buildonly-randconfig-r001-20230423 (https://download.01.org/0day-ci/archive/20230424/202304241058.bbuF6Fn4-lkp@intel.com/config)
compiler: clang version 17.0.0 (https://github.com/llvm/llvm-project 437b7602e4a998220871de78afcb020b9c14a661)
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 powerpc cross compiling tool for clang build
        # apt-get install binutils-powerpc-linux-gnu
        # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=5ba3747dbc9ade2d22a8f5bff3c928cb41d35030
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout 5ba3747dbc9ade2d22a8f5bff3c928cb41d35030
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=powerpc olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=powerpc SHELL=/bin/bash

If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <lkp@intel.com>
| Link: https://lore.kernel.org/oe-kbuild-all/202304241058.bbuF6Fn4-lkp@intel.com/

All errors (new ones prefixed by >>):

>> ld.lld: error: unknown argument '--ppc476-workaround'

Kconfig warnings: (for reference only)
   WARNING: unmet direct dependencies detected for HOTPLUG_CPU
   Depends on [n]: SMP [=y] && (PPC_PSERIES [=n] || PPC_PMAC [=n] || PPC_POWERNV [=n] || FSL_SOC_BOOKE [=n])
   Selected by [y]:
   - PM_SLEEP_SMP [=y] && SMP [=y] && (ARCH_SUSPEND_POSSIBLE [=y] || ARCH_HIBERNATION_POSSIBLE [=y]) && PM_SLEEP [=y]

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests

ld.lld: error: unknown argument '--ppc476-workaround'

[kernel test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   684a64bf32b6e488004e0ad7f0d7e922798f65b6
commit: e3a9ee963ad8ba677ca925149812c5932b49af69 kbuild: Fix changing ELF file type for output of gen_btf for big endian
date:   7 months ago
config: powerpc-randconfig-002-20240925 (https://download.01.org/0day-ci/archive/20240925/202409251512.QHl7WqZN-lkp@intel.com/config)
compiler: clang version 20.0.0git (https://github.com/llvm/llvm-project 7773243d9916f98ba0ffce0c3a960e4aa9f03e81)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240925/202409251512.QHl7WqZN-lkp@intel.com/reproduce)

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/202409251512.QHl7WqZN-lkp@intel.com/

All errors (new ones prefixed by >>):

>> ld.lld: error: unknown argument '--ppc476-workaround'

Kconfig warnings: (for reference only)
   WARNING: unmet direct dependencies detected for HOTPLUG_CPU
   Depends on [n]: SMP [=y] && (PPC_PSERIES [=n] || PPC_PMAC [=n] || PPC_POWERNV [=n] || FSL_SOC_BOOKE [=n])
   Selected by [y]:
   - PM_SLEEP_SMP [=y] && SMP [=y] && (ARCH_SUSPEND_POSSIBLE [=y] || ARCH_HIBERNATION_POSSIBLE [=y]) && PM_SLEEP [=y]

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki

Re: ld.lld: error: unknown argument '--ppc476-workaround'

[Nathan Chancellor]

On Wed, Sep 25, 2024 at 03:54:20PM +0800, kernel test robot wrote:
> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
> head:   684a64bf32b6e488004e0ad7f0d7e922798f65b6
> commit: e3a9ee963ad8ba677ca925149812c5932b49af69 kbuild: Fix changing ELF file type for output of gen_btf for big endian
> date:   7 months ago
> config: powerpc-randconfig-002-20240925 (https://download.01.org/0day-ci/archive/20240925/202409251512.QHl7WqZN-lkp@intel.com/config)
> compiler: clang version 20.0.0git (https://github.com/llvm/llvm-project 7773243d9916f98ba0ffce0c3a960e4aa9f03e81)
> reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240925/202409251512.QHl7WqZN-lkp@intel.com/reproduce)
> 
> 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/202409251512.QHl7WqZN-lkp@intel.com/
> 
> All errors (new ones prefixed by >>):
> 
> >> ld.lld: error: unknown argument '--ppc476-workaround'

I supppose LLD does not have this workaround flag. Perhaps this could be
encoded in Kconfig to avoid this?

diff --git a/arch/powerpc/platforms/44x/Kconfig b/arch/powerpc/platforms/44x/Kconfig
index 35a1f4b9f827..3c6c7c774d89 100644
--- a/arch/powerpc/platforms/44x/Kconfig
+++ b/arch/powerpc/platforms/44x/Kconfig
@@ -301,6 +301,7 @@ config APM821xx
 
 config 476FPE_ERR46
 	depends on 476FPE
+	depends on $(ld-option,--ppc476-workaround)
 	bool "Enable linker work around for PPC476FPE errata #46"
 	help
 	  This option enables a work around for an icache bug on 476