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Message-ID: <Pine.LNX.4.64.0710281618520.30465@fbirervta.pbzchgretzou.qr> Date: Sun, 28 Oct 2007 16:23:45 +0100 (CET) From: Jan Engelhardt <jengelh@...putergmbh.de> To: Roel Kluin <12o3l@...cali.nl> cc: lkml <linux-kernel@...r.kernel.org> Subject: Re: Debugging activated during runtime On Oct 28 2007 16:15, Roel Kluin wrote: > >Wouldn't it be nice to be able to specify upon loading, or during runtime >to modules whether debug messages should be printed? modprobe ark3116 debug=1 Nothing new. >- No kernel recompile needed for debugging. >- Less *_DEBUG options required in menuconfig. > >How I think this could work: >Add to the module struct a bool to denote debugging state. If set, pr_debug >forwards messages to printk. > >Another advantage: >- A module could be loaded after an unexpected conditions (e.g. after a BUG_ON). After a BUG_ON, you are probably next to a panic. >Caveats I can see right now: >- For modules often loaded during boot this may not be a good solution. > >Alternatively, instead of a bool for the debug state, the module struct could >also get a log-level flag: messages below that level won't be printed. What problem are you trying to solve? YOu can pass the module a parameter that can control how printk-verbose it will act. That is entirely in your hands, and it does not need to extend struct module. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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