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    SubjectRe: ehci dynamic debug problem
    On Fri, 13 Apr 2012, Johannes Stezenbach wrote:

    > > But there is no such thing as dynamic debug for ehci, is there?
    > > There's a separate dynamic debug setting for each dev_dbg statement.
    > > So your ideal solution makes no sense.
    >
    > When CONFIG_DYNAMIC_DEBUG=y but ehci debug is disabled

    There is no such thing as ehci debug! So how can it be disabled?
    There's only an individual setting for each line of debugging code.

    > in /sys/kernel/debug/dynamic_debug/control, then
    > dbg_port() calls dbg_port_buf() which would
    > format the string, then calls ehci_dbg() which
    > calls dev_dbg() which discards it.
    >
    > Does it make sense now?

    No. What happens if dynamic debug is enabled for one line that calls
    dbg_port_buf() but not for another? There's no way to avoid the string
    formatting in both lines, even though one of them discards the result.

    Alan Stern



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