mac80211: mesh: use hlist for rmc cache

The RMC cache has 256 list heads plus a u32, which puts it at the
unfortunate size of 4104 bytes with padding.  kmalloc() will then
round this up to the next power-of-two, so we wind up actually
using two pages here where most of the second is wasted.

Switch to hlist heads here to reduce the structure size down to
fit within a page.

Signed-off-by: Bob Copeland <me@bobcopeland.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

1 files changed, 2 insertions, 2 deletions

diff --git a/net/mac80211/mesh.h b/net/mac80211/mesh.h
index e1415c952e9c..bc3f9a32b5a4 100644
--- a/net/mac80211/mesh.h
+++ b/net/mac80211/mesh.h
@@ -158,14 +158,14 @@ struct mesh_table {
  * that are found in the cache.
  */
 struct rmc_entry {
-	struct list_head list;
+	struct hlist_node list;
 	u32 seqnum;
 	unsigned long exp_time;
 	u8 sa[ETH_ALEN];
 };
 
 struct mesh_rmc {
-	struct list_head bucket[RMC_BUCKETS];
+	struct hlist_head bucket[RMC_BUCKETS];
 	u32 idx_mask;
 };