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

[Jeremy Fitzhardinge]

H. Peter Anvin wrote:
> 1. it means pda references are invalid if their offsets are ever more 
> than CONFIG_PHYSICAL_BASE (which I do not think is likely, but still...)

Why?

As an aside, could we solve the problems by making CONFIG_PHYSICAL_BASE 
0 - putting the percpu variables as the first thing in the kernel - and 
relocating on load?  That would avoid having to make a special PT_LOAD 
segment at 0.  Hm, would that result in the pda and the boot params 
getting mushed together?

   J
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