Subject: [PATCH v1 net-next 01/12] rtnetlink: Make per-netns RTNL dereference helpers to macro.

From: Kuniyuki Iwashima <[email-masked]>
Date: Mon, 21 Oct 2024 11:32:28 -0700

When CONFIG_DEBUG_NET_SMALL_RTNL is off, rtnl_net_dereference() is the
static inline wrapper of rtnl_dereference() returning a plain (void *)
pointer to make sure net is always evaluated as requested in [0].

But, it makes sparse complain [1] when the pointer has __rcu annotation:

  net/ipv4/devinet.c:674:47: sparse: warning: incorrect type in argument 2 (different address spaces)
  net/ipv4/devinet.c:674:47: sparse:    expected void *p
  net/ipv4/devinet.c:674:47: sparse:    got struct in_ifaddr [noderef] __rcu *

Also, if we evaluate net as (void *) in a macro, then the compiler
in turn fails to build due to -Werror=unused-value.

  #define rtnl_net_dereference(net, p)                  \
        ({                                              \
                (void *)net;                            \
                rtnl_dereference(p);                    \
        })

  net/ipv4/devinet.c: In function ‘inet_rtm_deladdr’:
  ./include/linux/rtnetlink.h:154:17: error: statement with no effect [-Werror=unused-value]
    154 |                 (void *)net;                            \
  net/ipv4/devinet.c:674:21: note: in expansion of macro ‘rtnl_net_dereference’
    674 |              (ifa = rtnl_net_dereference(net, *ifap)) != NULL;
        |                     ^~~~~~~~~~~~~~~~~~~~

Let's go back to the original simplest macro.

Note that checkpatch complains about this approach, but it's one-shot and
less noisy than the other two.

  WARNING: Argument 'net' is not used in function-like macro
  #76: FILE: include/linux/rtnetlink.h:142:
  +#define rtnl_net_dereference(net, p)			\
  +	rtnl_dereference(p)

Fixes: 844e5e7e656d ("rtnetlink: Add assertion helpers for per-netns RTNL.")
Link: https://lore.kernel.org/netdev/[email-masked]/ [0]
Reported-by: kernel test robot <[email-masked]>
Closes: https://lore.kernel.org/oe-kbuild-all/[email-masked]/ [1]
Signed-off-by: Kuniyuki Iwashima <[email-masked]>
---
 include/linux/rtnetlink.h | 21 ++++++---------------
 1 file changed, 6 insertions(+), 15 deletions(-)

diff --git a/include/linux/rtnetlink.h b/include/linux/rtnetlink.h
index 8468a4ce8510..0e62918de63b 100644
--- a/include/linux/rtnetlink.h
+++ b/include/linux/rtnetlink.h
@@ -137,21 +137,12 @@ static inline void ASSERT_RTNL_NET(struct net *net)
 	ASSERT_RTNL();
 }
 
-static inline void *rcu_dereference_rtnl_net(struct net *net, void *p)
-{
-	return rcu_dereference_rtnl(p);
-}
-
-static inline void *rtnl_net_dereference(struct net *net, void *p)
-{
-	return rtnl_dereference(p);
-}
-
-static inline void *rcu_replace_pointer_rtnl_net(struct net *net,
-						 void *rp, void *p)
-{
-	return rcu_replace_pointer_rtnl(rp, p);
-}
+#define rcu_dereference_rtnl_net(net, p)		\
+	rcu_dereference_rtnl(p)
+#define rtnl_net_dereference(net, p)			\
+	rtnl_dereference(p)
+#define rcu_replace_pointer_rtnl_net(net, rp, p)	\
+	rcu_replace_pointer_rtnl(rp, p)
 #endif
 
 static inline struct netdev_queue *dev_ingress_queue(struct net_device *dev)
-- 
2.39.5 (Apple Git-154)