Messages in this thread | | | Subject | Re: printk() vs tty_io | From | Peter Zijlstra <> | Date | Wed, 14 Dec 2011 10:43:17 +0100 |
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On Wed, 2011-12-14 at 07:59 +0100, Ingo Molnar wrote:
> 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.
Yeah, they're horrible.. took me long enough to reproduce, and even now I know how its not easy.
Anyway, I just posted the two patches that make lockdep do early_printk(), they're not too horrid. I still need to look at making dump_stack() play nice as well, but so far I've managed to grok bits from the held lock output only.
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