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    SubjectRe: [PATCH] Resurrect old pr_debug() semantics as pr_devel()
    On Mon, Apr 06, 2009 at 02:30:03PM +1000, Michael Ellerman wrote:
    > pr_debug() used to produce zero code unless DEBUG was #defined. This is
    > now no longer the case in practice[1].
    > There are places where it's useful to have debugging printks, but we
    > don't want them to generate any code in production kernels.
    > So add a new macro, pr_devel(), for _devel_opment, to provide the old
    > semantics, ie. if the programmer doesn't explicitly enable debugging,
    > no code is produced.
    > [1]: You can turn CONFIG_DYNAMIC_DEBUG off, but it's enabled in at least
    > one distro kernel, so it's not really a solution.

    hmm...its designed to have low overhead when CONFIG_DYNAMIC_DEBUG
    is on, but none of the debugging printks are enabled. Is there a
    specific benchmark or test case that is unaccpetable?



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