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    SubjectRe: [GIT PULL] x86 fixes

    * Andy Lutomirski <luto@amacapital.net> wrote:

    > On Mon, Aug 17, 2015 at 1:01 AM, Ingo Molnar <mingo@kernel.org> wrote:
    >
    > > So when I re-introduced static allocations math-emu started working again, to
    > > a limited degree: on a modern distro, trying to boot /bin/bash I got a prompt,
    > > but various programs would segfault. I did not investigate it any deeper, I
    > > suppose the FPU emulation does not go far enough for modern user-space, or
    > > maybe it has more bugs.
    >
    > Were you testing with just no387 or did you run a VM with SSE2 and such turned
    > off?
    >
    > There's a *lot* of userspace that incorrectly checks for instructions without
    > checking for the state support. I've filed bugs against libgcc for this and
    > they're still not fixed IIRC.

    I tested relatively ancient user-space, 2007 era Fedora Core 6 - but I didn't
    check whether it's truly SSE-less (it probably isn't).

    Thanks,

    Ingo


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