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SubjectRe: [RFC] framework for fpu usage in kernel
> memcopy is a really generic function, and calling it saves the current
> fpu state into thread.i387.f{,x}save. IMHO that's wrong, memcopy must
> save into a local buffer like raid5 checksumming.

The mmx copy is only done in task context. There are a whole variety
of _horrible_ problems doing it in interrupt space so based on the
considerable number of problems with prior attempts to get it right on
IRQ and copyuser cases I didnt bother
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