Re: printk in a driver

[Amit D Chaudhary <amit@muppetlabs.com>]

printk should be enough.
There is another possiblity, incase you are using X-Window instead of console 
the messages might be going to /var/log/messages.

Amit


Guennadi Liakhovetski wrote:

> Hello
> 
> I am trying to see what's going on inside the ioctl() called by hdparm -d1
> /dev/hda. It seems to me that the routine that should be called on this is
> set_using_dma() in ide.c. So I edited it and inserted a couple of
> printk() calls, one in the very beginning. But nothing is printed. So, I
> can see 2 possibilities: 1) the routine is never entered; 2) printk
> doesn't work because I missed something.
> QUESTION: Is just inserting a printk() call anywhere in the kernel
> (provided there is a #include linux/kernel.h) sufficient? Or are there any
> macros (like DEBUG or similar) involved? If it is sufficient and the
> routine is never entered - why? (put it softer - what can be the
> reason?) Any partial replies also welcome.
> 
> Thanks
> Guennadi
> ___
> 
> Dr. Guennadi V. Liakhovetski
> Department of Applied Mathematics
> University of Sheffield, U.K.
> email: G.Liakhovetski@sheffield.ac.uk
> 
> 
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Kernelnewbies: Help each other learn about the Linux kernel.
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