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    SubjectRe: printk() vs tty_io
    * Peter Zijlstra <peterz@infradead.org> wrote:

    > Hi tty folks,
    >
    > I've been poking at reducing the constraints on printk(), like make it
    > work under rq->lock etc..
    >
    > Aside from a fwd port of the patch that abuses the
    > console_sem.lock: https://lkml.org/lkml/2011/6/9/298 and a few
    > other not so very pretty patches, I ran into the following
    > lockdep splat (using a not so very pretty lockdep
    > early_printk() patch):

    btw., would be nice to also somehow realeasify those debug hacks
    to preserve them for eternity - doing all lockdep output as
    earlyprintk while keeping printks working is a great way to
    debug printk() itself.

    Those printk lockups also took a *lot* of time for me to bisect.

    Thanks,

    Ingo


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