lkml.org 
[lkml]   [2016]   [Nov]   [23]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
Date
From
Subject[PATCH RFC] 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.

The following trivial patch disables the warning
without changing the behaviour in any way.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

---

I would appreciate review to confirm the function doesn't
do anything unsafe though.

In particular, should this use __hlist_for_each_rcu instead?
I note that __hlist_for_each_rcu does rcu_dereference
internally, which is missing here.

compile-tested only.

diff --git a/include/linux/rculist.h b/include/linux/rculist.h
index 8beb98d..33574db 100644
--- a/include/linux/rculist.h
+++ b/include/linux/rculist.h
@@ -511,7 +511,7 @@ 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))
+ for (i = h->first; i; i = i->next)
last = i;

if (last) {
\
 
 \ /
  Last update: 2016-11-23 21:49    [W:0.303 / U:0.516 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site