[dtrace-discuss] key #1 is incompatible with prototype

[Rafael Vanoni]

Running into a strange error with powertop(1). The script below, which 
worked until snv_107, fails with the following error

r...@catfish:~$ dtrace -s /tmp/freq.d
dtrace: failed to compile script /tmp/freq.d: line 13: last[ ] key #1 is 
incompatible with prototype:
        prototype: int
              key: struct vsd_node
r...@catfish:~$ cat /tmp/freq.d
hrtime_t last[int];

BEGIN
{
        begin = timestamp;
}

:::cpu-change-speed
/last[((cpudrv_devstate_t *)arg0)->cpu_id] != 0/
{
        this->cpu = ((cpudrv_devstate_t *)arg0)->cpu_id;
        this->oldspeed = ((cpudrv_pm_t *)arg1)->cur_spd->speed;
        @times[this->cpu, this->oldspeed] = sum(timestamp - last[this->cpu]);
        last[this->cpu] = timestamp;
}
:::cpu-change-speed
/last[((cpudrv_devstate_t *)arg0)->cpu_id] == 0/
{
        this->cpu = ((cpudrv_devstate_t *)arg0)->cpu_id;
        this->oldspeed = ((cpudrv_pm_t *)arg1)->cur_spd->speed;
        @times[this->cpu, this->oldspeed] = sum(timestamp - begin);
        last[this->cpu] = timestamp;
}


If I replace

        hrtime_t last[int];

with something like

        hrtime_t last[2];

I get

r...@catfish:~$ dtrace -s /tmp/freq.d
dtrace: failed to compile script /tmp/freq.d: line 13: operands have 
incompatible types: "hrtime_t [2]" + "struct vsd_node"

Line 13 being

@times[this->cpu, this->oldspeed] = sum(timestamp - last[this->cpu]);


Any ideas ?

Thanks,
Rafael



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