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authorMichael S. Tsirkin <mst@redhat.com>2017-02-27 22:14:19 +0300
committerPaul E. McKenney <paulmck@linux.vnet.ibm.com>2017-04-19 19:29:18 +0300
commit48ac34666ff76843d8743db1cc78b303759916f1 (patch)
tree4a44a13177bcdb5e513bda83d830480e4b26262b /include/linux/rculist.h
parentd1e4f01d09b88c6df3e9f6b8ca5f1a3882069ccc (diff)
downloadlinux-48ac34666ff76843d8743db1cc78b303759916f1.tar.xz
hlist_add_tail_rcu disable sparse warning
sparse is unhappy about this code in hlist_add_tail_rcu: struct hlist_node *i, *last = NULL; for (i = hlist_first_rcu(h); i; i = hlist_next_rcu(i)) last = i; This is because hlist_next_rcu and hlist_next_rcu return __rcu pointers. It's a false positive - it's a write side primitive and so does not need to be called in a read side critical section. The following trivial patch disables the warning without changing the behaviour in any way. Note: __hlist_for_each_rcu would also remove the warning but it would be confusing since it calls rcu_derefence and is designed to run in the rcu read side critical section. Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Reviewed-by: Steven Rostedt (VMware) <rostedt@goodmis.org> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Diffstat (limited to 'include/linux/rculist.h')
-rw-r--r--include/linux/rculist.h3
1 files changed, 2 insertions, 1 deletions
diff --git a/include/linux/rculist.h b/include/linux/rculist.h
index 4f7a9561b8c4..b1fd8bf85fdc 100644
--- a/include/linux/rculist.h
+++ b/include/linux/rculist.h
@@ -509,7 +509,8 @@ static inline void hlist_add_tail_rcu(struct hlist_node *n,
{
struct hlist_node *i, *last = NULL;
- for (i = hlist_first_rcu(h); i; i = hlist_next_rcu(i))
+ /* Note: write side code, so rcu accessors are not needed. */
+ for (i = h->first; i; i = i->next)
last = i;
if (last) {