Re: Debugging activated during runtime

[Jan Engelhardt <jengelh@computergmbh.de>]

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.
-
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