Merge branch 'nla_nest_start'

Michal Kubecek says:

====================
make nla_nest_start() add NLA_F_NESTED flag

One of the comments in recent review of the ethtool netlink series pointed
out that proposed ethnl_nest_start() helper which adds NLA_F_NESTED to
second argument of nla_nest_start() is not really specific to ethtool
netlink code. That is hard to argue with as closer inspection revealed that
exactly the same helper already exists in ipset code (except it's a macro
rather than an inline function).

Another observation was that even if NLA_F_NESTED flag was introduced in
2007, only few netlink based interfaces set it in kernel generated messages
and even many recently added APIs omit it. That is unfortunate as without
the flag, message parsers not familiar with attribute semantics cannot
recognize nested attributes and do not see message structure; this affects
e.g. wireshark dissector or mnl_nlmsg_fprintf() from libmnl.

This is why I'm suggesting to rename existing nla_nest_start() to different
name (nla_nest_start_noflag) and reintroduce nla_nest_start() as a wrapper
adding NLA_F_NESTED flag. This is implemented in first patch which is
mostly generated by spatch. Second patch drops ipset helper macros which
lose their purpose. Third patch cleans up minor coding style issues found
by checkpatch.pl in first patch.

We could leave nla_nest_start() untouched and simply add a wrapper adding
NLA_F_NESTED but that would probably preserve the state when even most new
code doesn't set the flag.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>

114 files changed, 565 insertions, 494 deletions

diff --git a/drivers/block/drbd/drbd_nl.c b/drivers/block/drbd/drbd_nl.c
index f2471172a961..1cb5a0b85fd9 100644
--- a/drivers/block/drbd/drbd_nl.c
+++ b/drivers/block/drbd/drbd_nl.c
@@ -114,7 +114,7 @@ static int drbd_msg_put_info(struct sk_buff *skb, const char *info)
 	if (!info || !info[0])
 		return 0;
 
-	nla = nla_nest_start(skb, DRBD_NLA_CFG_REPLY);
+	nla = nla_nest_start_noflag(skb, DRBD_NLA_CFG_REPLY);
 	if (!nla)
 		return err;
 
@@ -135,7 +135,7 @@ static int drbd_msg_sprintf_info(struct sk_buff *skb, const char *fmt, ...)
 	int err = -EMSGSIZE;
 	int len;
 
-	nla = nla_nest_start(skb, DRBD_NLA_CFG_REPLY);
+	nla = nla_nest_start_noflag(skb, DRBD_NLA_CFG_REPLY);
 	if (!nla)
 		return err;
 
@@ -3269,7 +3269,7 @@ static int nla_put_drbd_cfg_context(struct sk_buff *skb,
 				    struct drbd_device *device)
 {
 	struct nlattr *nla;
-	nla = nla_nest_start(skb, DRBD_NLA_CFG_CONTEXT);
+	nla = nla_nest_start_noflag(skb, DRBD_NLA_CFG_CONTEXT);
 	if (!nla)
 		goto nla_put_failure;
 	if (device &&
@@ -3837,7 +3837,7 @@ static int nla_put_status_info(struct sk_buff *skb, struct drbd_device *device,
 	if (err)
 		goto nla_put_failure;
 
-	nla = nla_nest_start(skb, DRBD_NLA_STATE_INFO);
+	nla = nla_nest_start_noflag(skb, DRBD_NLA_STATE_INFO);
 	if (!nla)
 		goto nla_put_failure;
 	if (nla_put_u32(skb, T_sib_reason, sib ? sib->sib_reason : SIB_GET_STATUS_REPLY) ||
diff --git a/drivers/block/nbd.c b/drivers/block/nbd.c
index 92b8aafb8bb4..cd27f236431d 100644
--- a/drivers/block/nbd.c
+++ b/drivers/block/nbd.c
@@ -2047,7 +2047,7 @@ static int populate_nbd_status(struct nbd_device *nbd, struct sk_buff *reply)
 	 */
 	if (refcount_read(&nbd->config_refs))
 		connected = 1;
-	dev_opt = nla_nest_start(reply, NBD_DEVICE_ITEM);
+	dev_opt = nla_nest_start_noflag(reply, NBD_DEVICE_ITEM);
 	if (!dev_opt)
 		return -EMSGSIZE;
 	ret = nla_put_u32(reply, NBD_DEVICE_INDEX, nbd->index);
@@ -2095,7 +2095,7 @@ static int nbd_genl_status(struct sk_buff *skb, struct genl_info *info)
 		goto out;
 	}
 
-	dev_list = nla_nest_start(reply, NBD_ATTR_DEVICE_LIST);
+	dev_list = nla_nest_start_noflag(reply, NBD_ATTR_DEVICE_LIST);
 	if (index == -1) {
 		ret = idr_for_each(&nbd_index_idr, &status_cb, reply);
 		if (ret) {
diff --git a/drivers/infiniband/core/nldev.c b/drivers/infiniband/core/nldev.c
index 11ed58d3fce5..ad189a29cc67 100644
--- a/drivers/infiniband/core/nldev.c
+++ b/drivers/infiniband/core/nldev.c
@@ -292,7 +292,8 @@ static int fill_res_info_entry(struct sk_buff *msg,
 {
 	struct nlattr *entry_attr;
 
-	entry_attr = nla_nest_start(msg, RDMA_NLDEV_ATTR_RES_SUMMARY_ENTRY);
+	entry_attr = nla_nest_start_noflag(msg,
+					   RDMA_NLDEV_ATTR_RES_SUMMARY_ENTRY);
 	if (!entry_attr)
 		return -EMSGSIZE;
 
@@ -327,7 +328,7 @@ static int fill_res_info(struct sk_buff *msg, struct ib_device *device)
 	if (fill_nldev_handle(msg, device))
 		return -EMSGSIZE;
 
-	table_attr = nla_nest_start(msg, RDMA_NLDEV_ATTR_RES_SUMMARY);
+	table_attr = nla_nest_start_noflag(msg, RDMA_NLDEV_ATTR_RES_SUMMARY);
 	if (!table_attr)
 		return -EMSGSIZE;
 
@@ -1108,7 +1109,7 @@ static int res_get_common_dumpit(struct sk_buff *skb,
 		goto err;
 	}
 
-	table_attr = nla_nest_start(skb, fe->nldev_attr);
+	table_attr = nla_nest_start_noflag(skb, fe->nldev_attr);
 	if (!table_attr) {
 		ret = -EMSGSIZE;
 		goto err;
@@ -1134,7 +1135,7 @@ static int res_get_common_dumpit(struct sk_buff *skb,
 
 		filled = true;
 
-		entry_attr = nla_nest_start(skb, fe->entry);
+		entry_attr = nla_nest_start_noflag(skb, fe->entry);
 		if (!entry_attr) {
 			ret = -EMSGSIZE;
 			rdma_restrack_put(res);
diff --git a/drivers/infiniband/hw/cxgb4/restrack.c b/drivers/infiniband/hw/cxgb4/restrack.c
index 9a7520ee41e0..f82d46ed969d 100644
--- a/drivers/infiniband/hw/cxgb4/restrack.c
+++ b/drivers/infiniband/hw/cxgb4/restrack.c
@@ -149,7 +149,7 @@ static int fill_res_qp_entry(struct sk_buff *msg,
 	if (qhp->ucontext)
 		return 0;
 
-	table_attr = nla_nest_start(msg, RDMA_NLDEV_ATTR_DRIVER);
+	table_attr = nla_nest_start_noflag(msg, RDMA_NLDEV_ATTR_DRIVER);
 	if (!table_attr)
 		goto err;
 
@@ -216,7 +216,7 @@ static int fill_res_ep_entry(struct sk_buff *msg,
 	if (!uep)
 		return 0;
 
-	table_attr = nla_nest_start(msg, RDMA_NLDEV_ATTR_DRIVER);
+	table_attr = nla_nest_start_noflag(msg, RDMA_NLDEV_ATTR_DRIVER);
 	if (!table_attr)
 		goto err_free_uep;
 
@@ -387,7 +387,7 @@ static int fill_res_cq_entry(struct sk_buff *msg,
 	if (ibcq->uobject)
 		return 0;
 
-	table_attr = nla_nest_start(msg, RDMA_NLDEV_ATTR_DRIVER);
+	table_attr = nla_nest_start_noflag(msg, RDMA_NLDEV_ATTR_DRIVER);
 	if (!table_attr)
 		goto err;
 
@@ -447,7 +447,7 @@ static int fill_res_mr_entry(struct sk_buff *msg,
 	if (!stag)
 		return 0;
 
-	table_attr = nla_nest_start(msg, RDMA_NLDEV_ATTR_DRIVER);
+	table_attr = nla_nest_start_noflag(msg, RDMA_NLDEV_ATTR_DRIVER);
 	if (!table_attr)
 		goto err;
 
diff --git a/drivers/net/bonding/bond_netlink.c b/drivers/net/bonding/bond_netlink.c
index b286f591242e..022044b59d6a 100644
--- a/drivers/net/bonding/bond_netlink.c
+++ b/drivers/net/bonding/bond_netlink.c
@@ -546,7 +546,7 @@ static int bond_fill_info(struct sk_buff *skb,
 	if (nla_put_u32(skb, IFLA_BOND_ARP_INTERVAL, bond->params.arp_interval))
 		goto nla_put_failure;
 
-	targets = nla_nest_start(skb, IFLA_BOND_ARP_IP_TARGET);
+	targets = nla_nest_start_noflag(skb, IFLA_BOND_ARP_IP_TARGET);
 	if (!targets)
 		goto nla_put_failure;
 
@@ -644,7 +644,7 @@ static int bond_fill_info(struct sk_buff *skb,
 		if (!bond_3ad_get_active_agg_info(bond, &info)) {
 			struct nlattr *nest;