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authorDavid S. Miller <davem@davemloft.net>2018-07-08 17:02:59 +0900
committerDavid S. Miller <davem@davemloft.net>2018-07-08 17:02:59 +0900
commit0dbc81eab4d13f6d295da69c00e6efee2427b55c (patch)
tree1d96c91f21d0fe00842d48273f5dd2c219a28e78 /net
parente9ec8045644cf730d798cd8df8a6f8a86b7fba64 (diff)
net: sched: Fix warnings from xchg() on RCU'd cookie pointer.
The kbuild test robot reports: >> net/sched/act_api.c:71:15: sparse: incorrect type in initializer (different address spaces) @@ expected struct tc_cookie [noderef] <asn:4>*__ret @@ got [noderef] <asn:4>*__ret @@ net/sched/act_api.c:71:15: expected struct tc_cookie [noderef] <asn:4>*__ret net/sched/act_api.c:71:15: got struct tc_cookie *new_cookie >> net/sched/act_api.c:71:13: sparse: incorrect type in assignment (different address spaces) @@ expected struct tc_cookie *old @@ got struct tc_cookie [noderef] <struct tc_cookie *old @@ net/sched/act_api.c:71:13: expected struct tc_cookie *old net/sched/act_api.c:71:13: got struct tc_cookie [noderef] <asn:4>*[assigned] __ret >> net/sched/act_api.c:132:48: sparse: dereference of noderef expression Handle this in the usual way by force casting away the __rcu annotation when we are using xchg() on it. Fixes: eec94fdb0480 ("net: sched: use rcu for action cookie update") Reported-by: kbuild test robot <lkp@intel.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
-rw-r--r--net/sched/act_api.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/net/sched/act_api.c b/net/sched/act_api.c
index bf1c35f3deb6..66dc19746c63 100644
--- a/net/sched/act_api.c
+++ b/net/sched/act_api.c
@@ -68,7 +68,7 @@ static void tcf_set_action_cookie(struct tc_cookie __rcu **old_cookie,
{
struct tc_cookie *old;
- old = xchg(old_cookie, new_cookie);
+ old = xchg((__force struct tc_cookie **)old_cookie, new_cookie);
if (old)
call_rcu(&old->rcu, tcf_free_cookie_rcu);
}