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    SubjectRe: [PATCH 4/5] x86: Allow nesting of the debug stack IDT setting
    On 05/31/2012 12:25 PM, Steven Rostedt wrote:
    >> void debug_stack_set_zero(void)
    >> {
    >> if (this_cpu_inc_return(debug_stack_use_ctr) == 1)
    >
    > If an NMI comes in here, it will not update the IDT and will corrupt the
    > stack. The load_idt() must happen for all calls. There's only two static
    > IDT tables. It's either one or the other. Thus, if it loads it twice, it
    > will just set it to the same value. The counter is to know when to set
    > it back.
    >

    Now I'm really confused. Why would it have to set it if it is already set?

    -hpa


    --
    H. Peter Anvin, Intel Open Source Technology Center
    I work for Intel. I don't speak on their behalf.



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