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    SubjectRe: [PATCH v1 1/2] PM/runtime: introduce trace points for tracing rpm_* functions
    On Tue, 2011-09-27 at 22:36 +0200, Rafael J. Wysocki wrote:

    > > TP_printk("%pS:%s ret=%d", (void *)__entry->ip, __get_str(name),
    > > __entry->ret)
    > >
    > > try that.
    > Well, that certainly will work, but is it the right fix?

    Hehe, yes! The pS means to take a pointer and return the string version
    of the address. Like "schedule+0x3a". __entry->ip is the address of the
    function that called it __THIS_IP__ but we want to convert that into a
    string name.

    We use ip because both perf and trace-cmd should be smart enough to
    parse it too. As they both store the kallsyms into the data file.

    The (void *) is used because pS wants a pointer, and we stored the
    address as an unsigned long.

    -- Steve

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