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

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Message-ID: <20240927122553.GA908795@thelio-3990X>
Date: Fri, 27 Sep 2024 05:25:53 -0700
From: Nathan Chancellor <nathan@...nel.org>
To: kernel test robot <lkp@...el.com>
Cc: llvm@...ts.linux.dev, oe-kbuild-all@...ts.linux.dev,
	linux-kernel@...r.kernel.org,
	Masahiro Yamada <masahiroy@...nel.org>,
	Fangrui Song <maskray@...gle.com>,
	Nicolas Schier <nicolas@...sle.eu>,
	Kees Cook <keescook@...omium.org>,
	Justin Stitt <justinstitt@...gle.com>
Subject: Re: ld.lld: error: unknown argument '--ppc476-workaround'

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@...el.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