diff options
Diffstat (limited to 'backport/compat/backport-3.19.c')
| -rw-r--r-- | backport/compat/backport-3.19.c | 165 |
1 files changed, 0 insertions, 165 deletions
diff --git a/backport/compat/backport-3.19.c b/backport/compat/backport-3.19.c deleted file mode 100644 index 019644df..00000000 --- a/backport/compat/backport-3.19.c +++ /dev/null @@ -1,165 +0,0 @@ -/* - * Copyright (c) 2014 Hauke Mehrtens <hauke@hauke-m.de> - * - * Backport functionality introduced in Linux 3.19. - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License version 2 as - * published by the Free Software Foundation. - */ -#include <linux/wait.h> -#include <linux/sched.h> -#include <linux/kthread.h> -#include <linux/export.h> -#include <linux/net.h> -#include <linux/netdevice.h> -#include <linux/skbuff.h> -#include <linux/debugfs.h> - -#if LINUX_VERSION_IS_LESS(3,18,12) -static inline bool is_kthread_should_stop(void) -{ - return (current->flags & PF_KTHREAD) && kthread_should_stop(); -} - -/* - * DEFINE_WAIT_FUNC(wait, woken_wake_func); - * - * add_wait_queue(&wq, &wait); - * for (;;) { - * if (condition) - * break; - * - * p->state = mode; condition = true; - * smp_mb(); // A smp_wmb(); // C - * if (!wait->flags & WQ_FLAG_WOKEN) wait->flags |= WQ_FLAG_WOKEN; - * schedule() try_to_wake_up(); - * p->state = TASK_RUNNING; ~~~~~~~~~~~~~~~~~~ - * wait->flags &= ~WQ_FLAG_WOKEN; condition = true; - * smp_mb() // B smp_wmb(); // C - * wait->flags |= WQ_FLAG_WOKEN; - * } - * remove_wait_queue(&wq, &wait); - * - */ -long wait_woken(wait_queue_t *wait, unsigned mode, long timeout) -{ - set_current_state(mode); /* A */ - /* - * The above implies an smp_mb(), which matches with the smp_wmb() from - * woken_wake_function() such that if we observe WQ_FLAG_WOKEN we must - * also observe all state before the wakeup. - */ - if (!(wait->flags & WQ_FLAG_WOKEN) && !is_kthread_should_stop()) - timeout = schedule_timeout(timeout); - __set_current_state(TASK_RUNNING); - - /* - * The below implies an smp_mb(), it too pairs with the smp_wmb() from - * woken_wake_function() such that we must either observe the wait - * condition being true _OR_ WQ_FLAG_WOKEN such that we will not miss - * an event. - */ - set_mb(wait->flags, wait->flags & ~WQ_FLAG_WOKEN); /* B */ - - return timeout; -} -EXPORT_SYMBOL(wait_woken); - -int woken_wake_function(wait_queue_t *wait, unsigned mode, int sync, void *key) -{ - /* - * Although this function is called under waitqueue lock, LOCK - * doesn't imply write barrier and the users expects write - * barrier semantics on wakeup functions. The following - * smp_wmb() is equivalent to smp_wmb() in try_to_wake_up() - * and is paired with set_mb() in wait_woken(). - */ - smp_wmb(); /* C */ - wait->flags |= WQ_FLAG_WOKEN; - - return default_wake_function(wait, mode, sync, key); -} -EXPORT_SYMBOL(woken_wake_function); -#endif - -static u8 netdev_rss_key[NETDEV_RSS_KEY_LEN]; - -void netdev_rss_key_fill(void *buffer, size_t len) -{ - BUG_ON(len > sizeof(netdev_rss_key)); -#ifdef __BACKPORT_NET_GET_RANDOM_ONCE - net_get_random_once(netdev_rss_key, sizeof(netdev_rss_key)); - memcpy(buffer, netdev_rss_key, len); -#else - get_random_bytes(buffer, len); -#endif -} -EXPORT_SYMBOL_GPL(netdev_rss_key_fill); - -#if defined(CONFIG_DEBUG_FS) -struct debugfs_devm_entry { - int (*read)(struct seq_file *seq, void *data); - struct device *dev; -}; - -static int debugfs_devm_entry_open(struct inode *inode, struct file *f) -{ - struct debugfs_devm_entry *entry = inode->i_private; - - return single_open(f, entry->read, entry->dev); -} - -static const struct file_operations debugfs_devm_entry_ops = { - .owner = THIS_MODULE, - .open = debugfs_devm_entry_open, - .release = single_release, - .read = seq_read, - .llseek = seq_lseek -}; - -/** - * debugfs_create_devm_seqfile - create a debugfs file that is bound to device. - * - * @dev: device related to this debugfs file. - * @name: name of the debugfs file. - * @parent: a pointer to the parent dentry for this file. This should be a - * directory dentry if set. If this parameter is %NULL, then the - * file will be created in the root of the debugfs filesystem. - * @read_fn: function pointer called to print the seq_file content. - */ -struct dentry *debugfs_create_devm_seqfile(struct device *dev, const char *name, - struct dentry *parent, - int (*read_fn)(struct seq_file *s, - void *data)) -{ - struct debugfs_devm_entry *entry; - - if (IS_ERR(parent)) - return ERR_PTR(-ENOENT); - - entry = devm_kzalloc(dev, sizeof(*entry), GFP_KERNEL); - if (!entry) - return ERR_PTR(-ENOMEM); - - entry->read = read_fn; - entry->dev = dev; - - return debugfs_create_file(name, S_IRUGO, parent, entry, - &debugfs_devm_entry_ops); -} -EXPORT_SYMBOL_GPL(debugfs_create_devm_seqfile); - -#endif /* CONFIG_DEBUG_FS */ - -int skb_ensure_writable(struct sk_buff *skb, int write_len) -{ - if (!pskb_may_pull(skb, write_len)) - return -ENOMEM; - - if (!skb_cloned(skb) || skb_clone_writable(skb, write_len)) - return 0; - - return pskb_expand_head(skb, 0, 0, GFP_ATOMIC); -} -EXPORT_SYMBOL_GPL(skb_ensure_writable); |