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    SubjectRe: [PATCH -rt] CONFIG_PARAVIRT and CONFIG_MCOUNT don't play well together
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    On Fri, 2007-06-22 at 01:06 -0700, Chris Wright wrote:
    > Current -rt is broken when compiling with CONFIG_PARAVIRT and
    > CONFIG_MCOUNT both enabled. Because CONFIG_MCOUNT disables
    > CONFIG_REGPARM, the calling convention must once again be explicit
    > with fastcall. However, this was only half-way addressed in the -rt
    > patch (adding fastcall back to paravirt_ops function ptr declaration but
    > not the actual function definitions) so the compiled kernel has caller
    > putting stuff in registers and callee pulling things from the stack.
    > Impressive how far into boot it can get despite that ;-) Thanks to
    > Steven Rostedt for prodding me and starting the initial debugging.

    Chris, thanks a hell of a lot for looking into this!!!

    -rt doesn't do much with paravirt, but since both -rt and lguest are two
    things I love to play with, it was really bothering me that they were
    not getting along.

    Much appreciated!

    -- Steve


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