On running user mode helpers

[Jonathan Corbet <corbet-lk@lwn.net>]

I see we have a new "call_usermodehelper" routine now.  It looks like the
end result is similer to exec_usermodehelper, except that you no longer
need to mess with creating kernel threads yourself.

Is call_usermodehelper now the officially blessed way for kernel code to
run something in user space?  Perhaps exec_usermodehelper should become
private to kmod.c?

I also see that call_usermodehelper will call do_exit() if the exec fails,
while the path taken in request_module does not do that.  Can both be
right? 

Thanks,

jon

Jonathan Corbet
Executive editor, LWN.net
corbet@lwn.net
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