From: Eric Dumazet <redacted>
Date: Fri, 13 Mar 2009 23:30:31 +0100

David Miller a écrit :

quoted

quoted

Also, when an event was queued for later invocation, I also needed to keep
a reference on "struct socket" to make sure it doesnt disappear before
the invocation. Not all sockets are RCU guarded (we added RCU only for 
some protocols (TCP, UDP ...). So I found keeping a read_lock
on callback was the easyest thing to do. I now realize we might
overflow preempt_count, so special care is needed.

You're using this in UDP so... make the rule that you can't use
this with a non-RCU-quiescent protocol.

UDP/TCP only ? I though many other protocols (not all using RCU) were
using sock_def_readable() too...

Maybe create a inet_def_readable() just for this purpose :-)