On Die, 2013-12-03 at 08:38 -0500, Valdis.Kletnieks@vt.edu wrote:
On Tue, 03 Dec 2013 20:35:41 +0800, said:
For debugging purpose, I want something like 'getchar()' that can pause execution in the module code. Do any candidates I can choose?
You do not want that - there is way too much parallelism and asynchronous stuff in the kernel. Debugging with getchar() and the like pretty much works only in single-threaded stuff ....
The problem is that pausing execution in module code is dangerous, as if you hold any locks or anything like that, you can hang other threads or even the whole machine.
You probablhy want to be looking at the kgdb support, that is coded to work around a lot of the issues and you get full GDB support not just a getchar() pause.
Or just use printk() to print interesting values in interesting cases. Bernd -- Bernd Petrovitsch Email : bernd@petrovitsch.priv.at LUGA : http://www.luga.at