Re: [RFC 00/15] x86_64: Optimize percpu accesses

[Jeremy Fitzhardinge]

H. Peter Anvin wrote:
> Thinking about this some more, I don't know if it would make sense to 
> put the x86-64 stack canary at the *end* of the percpu area, and 
> otherwise use negative offsets.  That would make sure they were 
> readily reachable from %rip-based references from within the kernel 
> text area. 

If we can move the canary then a whole pile of options open up.  But the 
problem is that we can't.

   J

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