On Wed, 2013-10-09 at 15:36 -0700, Paul E. McKenney wrote:
> That would work, though it would probably give sparse complaints.
No sparse error here, as I said types are correct and SPARSE_RCU ready :
diff --git a/net/ipv6/ip6_tunnel.c b/net/ipv6/ip6_tunnel.c
index 583b77e..28f8495 100644
--- a/net/ipv6/ip6_tunnel.c
+++ b/net/ipv6/ip6_tunnel.c
@@ -245,7 +245,7 @@ ip6_tnl_unlink(struct ip6_tnl_net *ip6n, struct ip6_tnl *t)
(iter = rtnl_dereference(*tp)) != NULL;
tp = &iter->next) {
if (t == iter) {
- rcu_assign_pointer(*tp, t->next);
+ ACCESS_ONCE(*tp) = t->next;
break;
}
}
root@edumazet-glaptop:/usr/src/net-next# grep CONFIG_SPARSE_RCU_POINTER .config
CONFIG_SPARSE_RCU_POINTER=y
root@edumazet-glaptop:/usr/src/net-next# make C=2 net/ipv6/ip6_tunnel.o
make[1]: Nothing to be done for `all'.
make[1]: Nothing to be done for `relocs'.
CHK include/config/kernel.release
CHK include/generated/uapi/linux/version.h
CHK include/generated/utsrelease.h
CALL scripts/checksyscalls.sh
CHECK scripts/mod/empty.c
CHECK net/ipv6/ip6_tunnel.c
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