printk in a driver

[Guennadi Liakhovetski <g.liakhovetski@ragingbull.com>]

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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