-/*
- * Copyright (C) 2011 Mathieu Desnoyers (mathieu.desnoyers@efficios.com)
- *
- * wrapper around poll __pollwait and poll_get_entry. Using KALLSYMS to get its
- * address when available, else we need to have a kernel that exports this
- * function to GPL modules.
- *
- * Dual LGPL v2.1/GPL v2 license.
- */
-
-#ifdef CONFIG_KALLSYMS
-
-#include <linux/kallsyms.h>
-#include <linux/poll.h>
-
-struct poll_table_entry;
-struct splice_pipe_desc;
-
-static
-void (*__pollwait_sym)(struct file *filp, wait_queue_head_t *wait_address,
- poll_table *p);
-static
-struct poll_table_entry *(*poll_get_entry_sym)(struct poll_wqueues *p);
-
-void wrapper_pollwait_exclusive(struct file *filp,
- wait_queue_head_t *wait_address,
- poll_table *p)
-
-{
- struct poll_wqueues *pwq = container_of(p, struct poll_wqueues, pt);
- struct poll_table_entry *entry;
-
- if (!poll_get_entry_sym)
- poll_get_entry_sym = (void *) kallsyms_lookup_name("poll_get_entry");
- if (!poll_get_entry_sym) {
- printk(KERN_WARNING "LTTng: poll_get_entry_sym symbol lookup failed.\n");
- return;
- }
- entry = poll_get_entry_sym(pwq);
-
- if (!__pollwait_sym)
- __pollwait_sym = (void *) kallsyms_lookup_name("__pollwait");
- if (!__pollwait_sym) {
- printk(KERN_WARNING "LTTng: __pollwait symbol lookup failed.\n");
- return;
- }
- return __pollwait_sym(filp, wait_address, p);
-}
-
-#else
-
-#include <linux/poll.h>
-
-ssize_t wrapper_pollwait_exclusive(struct file *filp,
- wait_queue_head_t *wait_address,
- poll_table *p)
-{
- return pollwait_exclusive(filp, wait_address, p);
-}
-
-#endif