litmus-rt-ext-res.git - LITMUS^RT with extended reservations for Forbidden Zones paper @ RTAS'20

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author	Masanari Iida <standby24x7@gmail.com>	2014-01-27 12:57:08 -0500
committer	Pekka Enberg <penberg@kernel.org>	2014-01-31 06:52:25 -0500
commit	cb8ee1a3d429f8898972c869dd4792afb04e961a (patch)
tree	cb4f532c111a9f909c27c94b83ec041ee3fc08f6 /kernel/sysctl_binary.c
parent	67b6c900dc6dce65478d6fe37b60cd1e65bb80c2 (diff)

mm: Fix warning on make htmldocs caused by slab.c

This patch fixed following errors while make htmldocs Warning(/mm/slab.c:1956): No description found for parameter 'page' Warning(/mm/slab.c:1956): Excess function parameter 'slabp' description in 'slab_destroy' Incorrect function parameter "slabp" was set instead of "page" Acked-by: Christoph Lameter <cl@linux.com> Signed-off-by: Masanari Iida <standby24x7@gmail.com> Signed-off-by: Pekka Enberg <penberg@kernel.org>

Diffstat (limited to 'kernel/sysctl_binary.c')

0 files changed, 0 insertions, 0 deletions

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#include <linux/etherdevice.h>
#include <linux/if_macvlan.h>
#include <linux/interrupt.h>
#include <linux/nsproxy.h>
#include <linux/compat.h>
#include <linux/if_tun.h>
#include <linux/module.h>
#include <linux/skbuff.h>
#include <linux/cache.h>
#include <linux/sched.h>
#include <linux/types.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/wait.h>
#include <linux/cdev.h>
#include <linux/fs.h>

#include <net/net_namespace.h>
#include <net/rtnetlink.h>
#include <net/sock.h>
#include <linux/virtio_net.h>

/*
 * A macvtap queue is the central object of this driver, it connects
 * an open character device to a macvlan interface. There can be
 * multiple queues on one interface, which map back to queues
 * implemented in hardware on the underlying device.
 *
 * macvtap_proto is used to allocate queues through the sock allocation
 * mechanism.
 *
 * TODO: multiqueue support is currently not implemented, even though
 * macvtap is basically prepared for that. We will need to add this
 * here as well as in virtio-net and qemu to get line rate on 10gbit
 * adapters from a guest.
 */
struct macvtap_queue {
	struct sock sk;
	struct socket sock;
	struct socket_wq wq;
	int vnet_hdr_sz;
	struct macvlan_dev *vlan;
	struct file *file;
	unsigned int flags;
};

static struct proto macvtap_proto = {
	.name = "macvtap",
	.owner = THIS_MODULE,
	.obj_size = sizeof (struct macvtap_queue),
};

/*
 * Minor number matches netdev->ifindex, so need a potentially
 * large value. This also makes it possible to split the
 * tap functionality out again in the future by offering it
 * from other drivers besides macvtap. As long as every device
 * only has one tap, the interface numbers assure that the
 * device nodes are unique.
 */
static unsigned int macvtap_major;
#define MACVTAP_NUM_DEVS 65536
static struct class *macvtap_class;
static struct cdev macvtap_cdev;

static const struct proto_ops macvtap_socket_ops;

/*
 * RCU usage:
 * The macvtap_queue and the macvlan_dev are loosely coupled, the
 * pointers from one to the other can only be read while rcu_read_lock
 * or macvtap_lock is held.
 *
 * Both the file and the macvlan_dev hold a reference on the macvtap_queue
 * through sock_hold(&q->sk). When the macvlan_dev goes away first,
 * q->vlan becomes inaccessible. When the files gets closed,
 * macvtap_get_queue() fails.
 *
 * There may still be references to the struct sock inside of the
 * queue from outbound SKBs, but these never reference back to the
 * file or the dev. The data structure is freed through __sk_free
 * when both our references and any pending SKBs are gone.
 */
static DEFINE_SPINLOCK(macvtap_lock);

/*
 * Choose the next free queue, for now there is only one
 */
static int macvtap_set_queue(struct net_device *dev, struct file *file,
				struct macvtap_queue *q)
{
	struct macvlan_dev *vlan = netdev_priv(dev);
	int err = -EBUSY;

	spin_lock(&macvtap_lock);
	if (rcu_dereference(vlan->tap))
		goto out;

	err = 0;
	rcu_assign_pointer(q->vlan, vlan);
	rcu_assign_pointer(vlan->tap, q);
	sock_hold(&q->sk);

	q->file = file;
	file->private_data = q;

out:
	spin_unlock(&macvtap_lock);
	return err;
}

/*
 * The file owning the queue got closed, give up both
 * the reference that the files holds as well as the
 * one from the macvlan_dev if that still exists.
 *
 * Using the spinlock makes sure that we don't get
 * to the queue again after destroying it.
 */
static void macvtap_put_queue(struct macvtap_queue *q)
{
	struct macvlan_dev *vlan;

	spin_lock(&macvtap_lock);
	vlan = rcu_dereference(q->vlan);
	if (vlan) {
		rcu_assign_pointer(vlan->tap, NULL);
		rcu_assign_pointer(q->vlan, NULL);
		sock_put(&q->sk);
	}

	spin_unlock(&macvtap_lock);

	synchronize_rcu();
	sock_put(&q->sk);
}

/*
 * Since we only support one queue, just dereference the pointer.
 */
static struct macvtap_queue *macvtap_get_queue(struct net_device *dev,
					       struct sk_buff *skb)
{
	struct macvlan_dev *vlan = netdev_priv(dev);

	return rcu_dereference(vlan->tap);
}

/*
 * The net_device is going away, give up the reference
 * that it holds on the queue (all the queues one day)
 * and safely set the pointer from the queues to NULL.
 */
static void macvtap_del_queues(struct net_device *dev)
{
	struct macvlan_dev *vlan = netdev_priv(dev);
	struct macvtap_queue *q;

	spin_lock(&macvtap_lock);
	q = rcu_dereference(vlan->tap);
	if (!q) {
		spin_unlock(&macvtap_lock);
		return;
	}

	rcu_assign_pointer(vlan->tap, NULL);
	rcu_assign_pointer(q->vlan, NULL);
	spin_unlock(&macvtap_lock);

	synchronize_rcu();
	sock_put(&q->sk);
}

/*
 * Forward happens for data that gets sent from one macvlan


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