Changing sysctl values within the kernel?

[David Johnson]

Hi all,

I'm working on a kernel module and want to change sysctl values (specifically 
stop-a and printk) in response to a hardware event.

Is there an accepted way of setting sysctl values within the kernel (I can't 
seem to find any other module doing this), or is it a completely silly idea?

Would it perhaps be better to instead create a sysfs node and let a userspace 
daemon worry about setting the sysctl values?

Any advice greatly appreciated!

David.
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