Re: [PATCH] c/r: Take uts_sem during checkpoint and restart

["Serge E. Hallyn" <serue-r/Jw6+rmf7HQT0dZR+AlfA@public.gmane.org>]

Quoting Dan Smith (danms-r/Jw6+rmf7HQT0dZR+AlfA@public.gmane.org):
> SH> At checkpoint, you only need the uts_sem right around the reading
> SH> (and length-checking) of uts_ns->name.  You're keeping it around
> SH> writing into the checkpoint image (and cr_hbuf_get).
> 
> Right, okay.
> 
> SH> At restart, you shouldn't actually need uts_sem - the nsproxy is
> SH> not yet available to anyone else, so there is no chance of a race,
> SH> right?  Hmm, well maybe I'm being overly optimistic, since restart
> SH> is coordinated by userspace which could mess up and somehow run
> SH> sethostname(2) while it's supposed to be running sys_restart().
> SH> But then sys_restart() wouldn't yet have hooked up the task to the
> SH> new nsproxy.
> 
> Good, you passed the test.  Yeah, that's it... :)

woohoo

-serge