[Q] tracing/printing

Peter Senna Tschudin peter.senna at gmail.com
Thu Mar 15 17:10:02 UTC 2012


Not sure, but this may help you:




2012/3/14 Ezequiel García <elezegarcia at gmail.com>:
> Hi,
> I'm writing a video capture device and have a doubt about how to
> correctly print to screen.
> First, I suppose I should follow the rule "don't print unless there is
> something surprising to say", right?
> Second, I've found I need to print in a very verbose manner
> at developing stage so I should implement a debug param.
> I will probably adopt videobuf2 way (like many others) of
> defining a macro (dprintk or something).
> However, reading the source I've found there isn't a unified
> way to do this: some use printk (as defined macros), others
> use v4l_xxx, others use dev_xxx.
> I've adopted the latter, because I thought there could
> be many devices plugged, and using dev_xxx with
> the usb_device->dev helps seeing which is tracing.
> I'm not really sure if it is ok so I would love to
> hear some opinions about this sensible issue.
> Thanks!
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Peter Senna Tschudin
peter.senna at gmail.com
gpg id: 48274C36

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