[rds-devel] initial patches to support device migration

[Zach Brown]

> Please prepend "RDS:" or "RDS/IB:" as appropriate to patch subjects.

Sure.

> Also some changes unrelated to the main focus of the first patch  
> (kzalloc and the ib_send.c cleanups) may want to go in separate  
> patches.

The kzalloc() change is definitely related.  The cleanup path was  
changed to rely on nulled pointers.

The ib_send change is debatable.  Before the patch it could find a  
pointer to freed data.  After the patch it could find a null pointer.   
Changing the behaviour of ib_get_client_data() in the patch seems to  
make it reasonable to change users of it.

- z