Re: [PATCH 1/10] Cr4 is valid on some 486s

[Gerd Knorr]

Zachary Amsden wrote:
> You still need to preserve the originals so that you can patch in both 
> directions.  In the dynamic scenario, you need a multi-way set of 
> alternatives, with the most conservative of those compiled in inline.

Sure, alternatives_smp() puts both versions into the 
.altinstr_replacement section because of that ;)

The idea is to have SMP compiled in and let the normal 
apply_alternatives() handle the SMP->UP patching case using the new 
feature bit.  apply_alternatives_smp() handles UP->SMP patching when you 
plug in a new virtual CPU.

cheers,

  Gerd

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