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    SubjectRe: [PATCH 3/5] perf_counter: rework ioctl()s
    Peter Zijlstra writes:

    > Hmm, are you saying that the 3rd argument to unlocked_ioctl is actually
    > (void __user *) instead of unsigned long?

    He's saying (correctly) that using _IOR or _IOW implies that the ioctl
    is going to read or write the memory location pointed to by the 3rd
    argument to unlocked_ioctl. If the 3rd argument is just a number, not
    an address, I believe you should use _IO.

    Paul.


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