Re: [PATCH 4/4] x86/percpu: Use C for percpu read/write accessors

[Ingo Molnar]

* Uros Bizjak <ubizjak@xxxxxxxxx> wrote:

> diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
> index ecb256954351..1edf4a5b93ca 100644
> --- a/arch/x86/Kconfig
> +++ b/arch/x86/Kconfig
> @@ -2393,7 +2393,7 @@ config CC_HAS_NAMED_AS
>  
>  config USE_X86_SEG_SUPPORT
>  	def_bool y
> -	depends on CC_HAS_NAMED_AS && SMP
> +	depends on CC_HAS_NAMED_AS && SMP && !KASAN
> +	depends on CC_HAS_NAMED_AS && SMP && !KASAN

So I'd rather express this as a Kconfig quirk line, and explain each quirk.

Something like:

	depends on CC_HAS_NAMED_AS
	depends on SMP
	#
	# -fsanitize=kernel-address (KASAN) is at the moment incompatible
	# with named address spaces - see GCC bug #12345.
	#
	depends on !KASAN

... or so.

BTW., please also document the reason why !SMP is excluded.

Thanks,

	Ingo