Re: [PATCH 28/34] x86: wire up mprotect_key() system call

[Thomas Gleixner]

On Thu, 3 Dec 2015, Dave Hansen wrote:
>  #include <asm-generic/mman.h>
> diff -puN mm/Kconfig~pkeys-16-x86-mprotect_key mm/Kconfig
> --- a/mm/Kconfig~pkeys-16-x86-mprotect_key	2015-12-03 16:21:31.114920208 -0800
> +++ b/mm/Kconfig	2015-12-03 16:21:31.119920435 -0800
> @@ -679,4 +679,5 @@ config NR_PROTECTION_KEYS
>  	# Everything supports a _single_ key, so allow folks to
>  	# at least call APIs that take keys, but require that the
>  	# key be 0.
> +	default 16 if X86_INTEL_MEMORY_PROTECTION_KEYS
>  	default 1

What happens if I set that to 42?

I think we want to make this a runtime evaluated thingy. If pkeys are
compiled in, but the machine does not support it then we don't support
16 keys, or do we?

Thanks,

	tglx
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