It keeps your platform the same, and it does help other platforms.
It is the nature of any abstraction change we make in the kernel
that platforms have to deal with.
So at least we're to the point where you could be convinced that
there are no down sides to the change? Let's go over your list:
1) massive locore assembly changes
ummm no, just put current_thread_info into your thread register
2) pointer dereference causes performance problems
ummm no, not really, go test it for yourself if you don't
This only leaves "I don't want to do the conversion because it has
no benefit to ia64." Well, it doesn't hurt your platform either,
so just cope :-)
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