[PATCH 0/4 v2] Convert rhashtable to use bitlocks

[NeilBrown]

This series converts rhashtable to use a per-bucket bitlock
rather than a separate array of spinlocks.
This:
  reduces memory usage
  results in slightly fewer memory accesses
  slightly improves parallelism
  makes a configuration option unnecessary

The main change from previous version is to use a distinct type for
the pointer in the bucket which has a bit-lock in it.  This
helped find two places where rht_ptr() was missed, one
in  rhashtable_free_and_destroy() in print_ht in the test code.

Thanks,
NeilBrown

---

NeilBrown (4):
      rhashtable: use cmpxchg() in nested_table_alloc()
      rhashtable: allow rht_bucket_var to return NULL.
      rhashtable: use bit_spin_locks to protect hash bucket.
      rhashtable: add lockdep tracking to bucket bit-spin-locks.


 include/linux/rhashtable-types.h |    2 
 include/linux/rhashtable.h       |  271 ++++++++++++++++++++++++++------------
 ipc/util.c                       |    1 
 lib/rhashtable.c                 |  161 ++++++++++++-----------
 lib/test_rhashtable.c            |    2 
 net/bridge/br_fdb.c              |    1 
 net/bridge/br_multicast.c        |    1 
 net/bridge/br_vlan.c             |    1 
 net/bridge/br_vlan_tunnel.c      |    1 
 net/ipv4/ipmr.c                  |    1 
 net/ipv6/ip6mr.c                 |    1 
 net/netfilter/nf_tables_api.c    |    1 
 12 files changed, 271 insertions(+), 173 deletions(-)

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