Re: netns refcounting

[Daniel Lezcano <dlezcano-NmTC/0ZBporQT0dZR+AlfA@public.gmane.org>]

Denis V. Lunev wrote:
> Hello, All!
> 
> During port of Eric's patches I have noticed an interesting thing.
> The patch "net: Teach the ipv4 route cache to handle multiple network
> namespaces" call hold_net for each IPv4 DST cache entry.
> 
> Though it is not possible to stop a namespace without stopping all the
> devices inside. Additionally, the device can't be unregistered if there
> are dst entries to it. These entries are moved to a namespace loopback
> and the namespace will block until these entries will gone from a loopback.
> 
> So, I do not see a necessity to have an extra atomic on this hot path,
> i.e. hold_net can re moved away for this. Are there any holes?

That seems reasonable to remove, good catch.