Messages in this thread | | | Date | Wed, 14 Dec 2011 07:59:10 +0100 | From | Ingo Molnar <> | Subject | Re: printk() vs tty_io |
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* 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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