allmodconfig builds failing to link on arm64

[Will Deacon]

Hi Nathan,

On Fri, Apr 08, 2022 at 11:37:24AM -0700, Nathan Chancellor wrote:
> On Fri, Apr 08, 2022 at 10:17:21AM -0700, Nathan Chancellor wrote:
> diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
> index 57c4c995965f..1fd16faa7f31 100644
> --- a/arch/arm64/Kconfig
> +++ b/arch/arm64/Kconfig
> @@ -175,8 +175,6 @@ config ARM64
>  	select HAVE_DEBUG_KMEMLEAK
>  	select HAVE_DMA_CONTIGUOUS
>  	select HAVE_DYNAMIC_FTRACE
> -	select HAVE_DYNAMIC_FTRACE_WITH_REGS \
> -		if $(cc-option,-fpatchable-function-entry=2)
>  	select FTRACE_MCOUNT_USE_PATCHABLE_FUNCTION_ENTRY \
>  		if DYNAMIC_FTRACE_WITH_REGS
>  	select HAVE_EFFICIENT_UNALIGNED_ACCESS
> @@ -228,6 +226,17 @@ config ARM64
>  	help
>  	  ARM 64-bit (AArch64) Linux support.
>  
> +config CLANG_SUPPORTS_DYNAMIC_FTRACE_WITH_REGS
> +	def_bool CC_IS_CLANG
> +	# https://github.com/ClangBuiltLinux/linux/issues/1507
> +	depends on AS_IS_GNU || (AS_IS_LLVM && (LD_IS_LLD || LD_VERSION >= 23600))
> +	select HAVE_DYNAMIC_FTRACE_WITH_REGS
> +
> +config GCC_SUPPORTS_DYNAMIC_FTRACE_WITH_REGS
> +	def_bool CC_IS_GCC
> +	depends on $(cc-option,-fpatchable-function-entry=2)
> +	select HAVE_DYNAMIC_FTRACE_WITH_REGS
> +
>  config 64BIT
>  	def_bool y

FWIW, I can confirm that this fixes the problem for me:

Tested-by: Will Deacon <will at kernel.org.

Do you plan to post as a separate patch?

Will