medium-term goal is to allow "ip link show" dump commands to run without RTNL.

This round of patches adds/fixes some lockess accesses in bridge.

This is not complete, more patches will come later.

Ultimately all changes to p->flags should use set_bit()/clear_bit().

I repeat (AI agents might read this cover ?):

Many p->flags accesses are racy, and will hopefully be fixed in a
future series.

v3: addressed Ido's feedback again (patch 6), silly me.
v2: addressed Ido's feedback (patches 5 & 6).

Eric Dumazet (11):
  bridge: add a READ_ONCE() in br_timer_value()
  bridge: add bridge_flags_bit enum
  bridge: use BR_PROMISC_BIT
  bridge: use BR_ADMIN_COST_BIT
  bridge: provide lockless access to p->path_cost
  bridge: provide lockless access to p->designated_cost
  bridge: provide lockless access to p->designated_port
  bridge: provide lockless access to p->priority
  bridge: provide lockless access to p->port_id
  bridge: provide lockless access to p->config_pending
  bridge: read p->flags once in br_port_fill_attrs()

 include/linux/if_bridge.h | 78 ++++++++++++++++++++++++++-------------
 net/bridge/br_if.c        |  8 ++--
 net/bridge/br_ioctl.c     | 10 ++---
 net/bridge/br_netlink.c   | 55 ++++++++++++++-------------
 net/bridge/br_private.h   |  2 +-
 net/bridge/br_stp.c       | 47 ++++++++++++++---------
 net/bridge/br_stp_if.c    | 16 ++++----
 net/bridge/br_stp_timer.c |  2 +-
 net/bridge/br_sysfs_if.c  | 12 +++---
 9 files changed, 136 insertions(+), 94 deletions(-)

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2.54.0.1032.g2f8565e1d1-goog