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net: rtnl: introduce rcu_replace_pointer_rtnl

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Introduce the rcu_replace_pointer_rtnl helper to lockdep check rtnl lock
rcu replacements, alongside the already existing helpers.

This is a quality of life helper so instead of using:
   rcu_replace_pointer(rp, p, lockdep_rtnl_is_held())
   .. or the open coded..
   rtnl_dereference() / rcu_assign_pointer()
   .. or the lazy check version ..
   rcu_replace_pointer(rp, p, 1)
Use:
   rcu_replace_pointer_rtnl(rp, p)

Signed-off-by: Jamal Hadi Salim <jhs@mojatatu.com>
Signed-off-by: Victor Nogueira <victor@mojatatu.com>
Signed-off-by: Pedro Tammela <pctammela@mojatatu.com>
Reviewed-by: Ido Schimmel <idosch@nvidia.com>
Reviewed-by: Nikolay Aleksandrov <razor@blackwall.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jamal Hadi Salim 2023-12-15 14:57:10 -03:00 committed by David S. Miller
parent 54f4c2570a
commit 32da0f00dd
1 changed files with 12 additions and 0 deletions
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12
include/linux/rtnetlink.h
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@ -79,6 +79,18 @@ static inline bool lockdep_rtnl_is_held(void)
#define rtnl_dereference(p) \
rcu_dereference_protected(p, lockdep_rtnl_is_held())
/**
* rcu_replace_pointer_rtnl - replace an RCU pointer under rtnl_lock, returning
* its old value
* @rp: RCU pointer, whose value is returned
* @p: regular pointer
*
* Perform a replacement under rtnl_lock, where @rp is an RCU-annotated
* pointer. The old value of @rp is returned, and @rp is set to @p
*/
#define rcu_replace_pointer_rtnl(rp, p) \
rcu_replace_pointer(rp, p, lockdep_rtnl_is_held())
static inline struct netdev_queue *dev_ingress_queue(struct net_device *dev)
{
return rtnl_dereference(dev->ingress_queue);