> On Oct 13, 2016, at 2:14 PM, Joe Groff via swift-dev <swift-dev@swift.org> 
> wrote:
>> On Oct 13, 2016, at 2:04 PM, Alexis <abeingess...@apple.com> wrote:
>> Correct me if I’m wrong, but aren’t all kernel addresses negative on x64 and 
>> AArch64? Would this then mean any attempt to use Swift in kernel-space 
>> requires a distinct ABI?
> That's correct, but we'd likely already have to have a separate "kernel" ABI 
> due to our assumptions about spare bits in pointers.

This is exactly my thinking.

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