Re: [RFC PATCH 4/6] pkeys: Lift pkey hardware check for pkey_alloc()

[Sohil Mehta <sohil.mehta@xxxxxxxxx>]

> diff --git a/mm/mprotect.c b/mm/mprotect.c
> index ba5592655ee3..56d35de33725 100644
> --- a/mm/mprotect.c
> +++ b/mm/mprotect.c
> @@ -773,6 +773,9 @@ SYSCALL_DEFINE2(pkey_alloc, unsigned long, flags, unsigned long, init_val)
>   	int pkey;
>   	int ret;
>   
> +	if (!arch_pkeys_enabled())
> +		return -ENOSPC;
> +

See comments in patch 3/6. Since we are modifying (fixing) old behavior, 
should we just return ENOSYS to make this consistent?

Sohil

>   	/* No flags supported yet. */
>   	if (flags)
>   		return -EINVAL;