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

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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;





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