On Tue, 3 Oct 2006, Andi Kleen wrote:
>
> Actually I looked at the code more closely. It looks like kernel math
> emulation is much more broken. e.g. kernel_fpu_begin() is missing
> code and lots of other paths in i387 that need to check HAVE_HWFP don't.
No it's not.
kernel_fpu_begin() has the _one_ test that matters:
if (thread->status & TS_USEDFPU) {
since if software emulation is on, nobody will ever have the TS_USEDFPU
flag set.
> Fixing it properly would be much more work.
No. It's all fixed properly already.
The bug is simply on the newer FXSR paths - marking the FPU emulation
broken is just stupid.
Linus
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