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    SubjectRe: [PATCH/RFC] Math-emu kills the kernel on Athlon64 X2
    On Tue, 3 Oct 2006 09:37:45 -0700 (PDT) Linus Torvalds wrote:

    >
    >
    > On Tue, 3 Oct 2006, Randy Dunlap wrote:
    > >
    > > Yes, that works.
    >
    > Ok. I'll commit that simple thing, and add a comment on why we're
    > apparently doing the same thing twice (you do need _both_ of those things:
    > the "disable_x86_fxsr" will make sure all other CPU's also get cleared,
    > while the "clear_bit()" will clear it immediately on the boot CPU)
    >
    > I'll leave the no387/nofxsr linking alone for now. The main reason to use
    > no387 would seem to be just testing that emulation works at all, and I
    > guess we can just tell people to use the "no387 nofxsr" combination.
    >
    > So Randy, with this you can boot all the way into user space, and some FP
    > apps still work too?

    My few trivial float and double apps work.
    Is there any particular test/workload that you want me to run?

    > (Of course, user-space may be buggy and use SSE etc without testing for
    > whether the CPU actually supports it - if the install process has
    > installed some special SSE-version of a library depending on what the CPU
    > claimed at that point, or if somebody uses "cpuid" directly rather than
    > asking the kernel. So there's no way we're going to _guarantee_ that this
    > works in user space, but at least a well-behaved user-space that works on
    > a i486 should hopefully be ok).


    ---
    ~Randy
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