Re: get_current is __pure__, maybe __const__ even

[Andi Kleen]

> The scheduler quite rightly expects, for any thread, that any variable
> which may be stored in a CPU register before the context switch has the
> same value as after the context switch.

Just current isn't a varible, it's some inline assembly in a inline
function.  The question was if that function could be marked const/pure. 

-Andi
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