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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