[PATCH v3 net-next 2/7] net-sysfs: remove rcu field from 'struct rps_sock_flow_table'

[Eric Dumazet <edumazet@google.com>]

Removing rcu_head (and @mask in a following patch)
will allow a power-of-two allocation and thus high-order
allocation for better performance.

Signed-off-by: Eric Dumazet <edumazet@google.com>
---
 include/net/rps.h          | 1 -
 net/core/sysctl_net_core.c | 4 +++-
 2 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/include/net/rps.h b/include/net/rps.h
index f1794cd2e7fb32a36bde9959fab651663ab190fd..32cfa250d9f931b8ab1c94e0410d0820bb9c999f 100644
--- a/include/net/rps.h
+++ b/include/net/rps.h
@@ -60,7 +60,6 @@ struct rps_dev_flow_table {
  * meaning we use 32-6=26 bits for the hash.
  */
 struct rps_sock_flow_table {
-	struct rcu_head	rcu;
 	u32		mask;
 
 	u32		ents[] ____cacheline_aligned_in_smp;
diff --git a/net/core/sysctl_net_core.c b/net/core/sysctl_net_core.c
index 03aea10073f003b0339884ee0f40b8c96d7d22e2..0b659c932cffef45e05207890b8187d64ae3c85a 100644
--- a/net/core/sysctl_net_core.c
+++ b/net/core/sysctl_net_core.c
@@ -147,6 +147,7 @@ static int rps_sock_flow_sysctl(const struct ctl_table *table, int write,
 	};
 	struct rps_sock_flow_table *orig_sock_table, *sock_table;
 	static DEFINE_MUTEX(sock_flow_mutex);
+	void *tofree = NULL;
 
 	mutex_lock(&sock_flow_mutex);
 
@@ -193,13 +194,14 @@ static int rps_sock_flow_sysctl(const struct ctl_table *table, int write,
 			if (orig_sock_table) {
 				static_branch_dec(&rps_needed);
 				static_branch_dec(&rfs_needed);
-				kvfree_rcu(orig_sock_table, rcu);
+				tofree = orig_sock_table;
 			}
 		}
 	}
 
 	mutex_unlock(&sock_flow_mutex);
 
+	kvfree_rcu_mightsleep(tofree);
 	return ret;
 }
 #endif /* CONFIG_RPS */
-- 
2.53.0.473.g4a7958ca14-goog