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Subjectmm, x86, powerpc: pkey semantics for key-0 ?
Dave,

Is there a reason why the default key; key-0, is not allowed to be
explicitly associated with pages using pkey_mprotect()?

I see valid usecases where an application may initially want to
associate an address-range with some key and latter choose to revert to
its initial state, by associating key-0. However our implementation
(both x86 and power) do not allow pkey_mprotect() to be called with
key-0.

I do not see a reason why it must be blocked.

Thoughts?
RP

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