how to trace a kernel function without using kprobes

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Hi,

I need to trace some kernel driver functions. But kernel is not
compiled with kprobes and I am not allowed to recompile the kernel. So
I'm trying to write a kernel module to find out when a function say
linkwatch_fire_event() gets scheduled. I'm able to get a list of all
kernel threads but how do I find out if this function is currently
executing?
Could someone please help me?

-- 
Kiran

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