Hi all,
this is the second patch to implement hotplug resource limitation 
(relative to 2.6.7-rc2-mm2).

In some cases it is preferrable to adapt the number of concurrent 
hotplug processes on the fly in addition to set the number statically 
during boot. Additionally, it might be required to disable hotplug / 
kmod event delivery altogether for debugging purposes (e.g. if a module 
loaded automatically is crashing the machine).

This patch implements a new sysctl variable kernel.khelper_max (with 
proc interface /proc/sys/kernel/khelper_max) which holds the max # of 
concurrently running khelper threads. Setting this variable to '0' 
disables hotplug event delivery altogether. Events will not be lost but 
rather queued within the kernel (i.e. threads are cloned which wait on a 
semaphore to become free). This allows for a replay of missed events 
once the variable is increased again.

Further explanation on top of the patch.

Please apply.

Cheers,

Hannes
-- 
Dr. Hannes Reinecke			hare@suse.de
SuSE Linux AG				S390 & zSeries
Maxfeldstraße 5				+49 911 74053 688
90409 Nürnberg				http://www.suse.de