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    SubjectRe: [patch 00/13] Syslets, "Threadlets", generic AIO support, v3

    * Davide Libenzi <davidel@xmailserver.org> wrote:

    > [...] Status word and control bits should not be changed from
    > underneath userspace AFAIK. [...]

    Note that the control bits do not just magically change during normal
    FPU use. It's a bit like sys_setsid()/iopl/etc., it makes little sense
    to change those per-thread anyway. This is a non-issue anyway - what is
    important is that the big bulk of 512 (or more) bytes of FPU state /are/
    callee-saved (both on 32-bit and on 64-bit), hence there's no need to
    unlazy anything or to do expensive FPU state saves or other FPU juggling
    around threadlet (or even syslet) use.

    Ingo
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