annotate poll-related wait keys
__poll_t is also used as wait key in some waitqueues. Verify that wait_..._poll() gets __poll_t as key and provide a helper for wakeup functions to get back to that __poll_t value. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
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@ -46,7 +46,7 @@ static void virqfd_deactivate(struct virqfd *virqfd)
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static int virqfd_wakeup(wait_queue_entry_t *wait, unsigned mode, int sync, void *key)
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{
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struct virqfd *virqfd = container_of(wait, struct virqfd, wait);
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unsigned long flags = (unsigned long)key;
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__poll_t flags = key_to_poll(key);
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if (flags & POLLIN) {
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/* An event has been signaled, call function */
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@ -170,7 +170,7 @@ static int vhost_poll_wakeup(wait_queue_entry_t *wait, unsigned mode, int sync,
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{
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struct vhost_poll *poll = container_of(wait, struct vhost_poll, wait);
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if (!((unsigned long)key & poll->mask))
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if (!(key_to_poll(key) & poll->mask))
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return 0;
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vhost_poll_queue(poll);
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@ -211,7 +211,7 @@ int vhost_poll_start(struct vhost_poll *poll, struct file *file)
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mask = file->f_op->poll(file, &poll->table);
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if (mask)
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vhost_poll_wakeup(&poll->wait, 0, 0, (void *)(uintptr_t)mask);
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vhost_poll_wakeup(&poll->wait, 0, 0, poll_to_key(mask));
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if (mask & POLLERR) {
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if (poll->wqh)
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remove_wait_queue(poll->wqh, &poll->wait);
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@ -1117,6 +1117,7 @@ static int ep_poll_callback(wait_queue_entry_t *wait, unsigned mode, int sync, v
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unsigned long flags;
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struct epitem *epi = ep_item_from_wait(wait);
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struct eventpoll *ep = epi->ep;
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__poll_t pollflags = key_to_poll(key);
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int ewake = 0;
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spin_lock_irqsave(&ep->lock, flags);
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@ -1138,7 +1139,7 @@ static int ep_poll_callback(wait_queue_entry_t *wait, unsigned mode, int sync, v
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* callback. We need to be able to handle both cases here, hence the
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* test for "key" != NULL before the event match test.
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*/
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if (key && !((unsigned long) key & epi->event.events))
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if (pollflags && !(pollflags & epi->event.events))
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goto out_unlock;
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/*
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@ -1175,8 +1176,8 @@ static int ep_poll_callback(wait_queue_entry_t *wait, unsigned mode, int sync, v
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*/
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if (waitqueue_active(&ep->wq)) {
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if ((epi->event.events & EPOLLEXCLUSIVE) &&
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!((unsigned long)key & POLLFREE)) {
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switch ((unsigned long)key & EPOLLINOUT_BITS) {
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!(pollflags & POLLFREE)) {
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switch (pollflags & EPOLLINOUT_BITS) {
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case POLLIN:
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if (epi->event.events & POLLIN)
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ewake = 1;
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@ -1205,7 +1206,7 @@ out_unlock:
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if (!(epi->event.events & EPOLLEXCLUSIVE))
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ewake = 1;
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if ((unsigned long)key & POLLFREE) {
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if (pollflags & POLLFREE) {
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/*
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* If we race with ep_remove_wait_queue() it can miss
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* ->whead = NULL and do another remove_wait_queue() after
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@ -212,7 +212,7 @@ static int pollwake(wait_queue_entry_t *wait, unsigned mode, int sync, void *key
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struct poll_table_entry *entry;
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entry = container_of(wait, struct poll_table_entry, wait);
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if (key && !((unsigned long)key & entry->key))
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if (key && !(key_to_poll(key) & entry->key))
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return 0;
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return __pollwake(wait, mode, sync, key);
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}
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@ -206,14 +206,16 @@ void __wake_up_sync(struct wait_queue_head *wq_head, unsigned int mode, int nr);
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/*
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* Wakeup macros to be used to report events to the targets.
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*/
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#define poll_to_key(m) ((void *)(__force uintptr_t)(__poll_t)(m))
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#define key_to_poll(m) ((__force __poll_t)(uintptr_t)(void *)(m))
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#define wake_up_poll(x, m) \
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__wake_up(x, TASK_NORMAL, 1, (void *) (m))
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__wake_up(x, TASK_NORMAL, 1, poll_to_key(m))
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#define wake_up_locked_poll(x, m) \
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__wake_up_locked_key((x), TASK_NORMAL, (void *) (m))
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__wake_up_locked_key((x), TASK_NORMAL, poll_to_key(m))
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#define wake_up_interruptible_poll(x, m) \
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__wake_up(x, TASK_INTERRUPTIBLE, 1, (void *) (m))
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__wake_up(x, TASK_INTERRUPTIBLE, 1, poll_to_key(m))
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#define wake_up_interruptible_sync_poll(x, m) \
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__wake_up_sync_key((x), TASK_INTERRUPTIBLE, 1, (void *) (m))
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__wake_up_sync_key((x), TASK_INTERRUPTIBLE, 1, poll_to_key(m))
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#define ___wait_cond_timeout(condition) \
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({ \
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@ -3777,7 +3777,7 @@ static int memcg_event_wake(wait_queue_entry_t *wait, unsigned mode,
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struct mem_cgroup_event *event =
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container_of(wait, struct mem_cgroup_event, wait);
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struct mem_cgroup *memcg = event->memcg;
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unsigned long flags = (unsigned long)key;
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__poll_t flags = key_to_poll(key);
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if (flags & POLLHUP) {
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/*
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@ -72,12 +72,10 @@ static inline int connection_based(struct sock *sk)
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static int receiver_wake_function(wait_queue_entry_t *wait, unsigned int mode, int sync,
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void *key)
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{
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unsigned long bits = (unsigned long)key;
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/*
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* Avoid a wakeup if event not interesting for us
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*/
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if (bits && !(bits & (POLLIN | POLLERR)))
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if (key && !(key_to_poll(key) & (POLLIN | POLLERR)))
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return 0;
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return autoremove_wake_function(wait, mode, sync, key);
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}
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@ -367,7 +367,7 @@ static int unix_dgram_peer_wake_relay(wait_queue_entry_t *q, unsigned mode, int
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/* relaying can only happen while the wq still exists */
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u_sleep = sk_sleep(&u->sk);
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if (u_sleep)
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wake_up_interruptible_poll(u_sleep, key);
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wake_up_interruptible_poll(u_sleep, key_to_poll(key));
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return 0;
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}
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@ -188,7 +188,7 @@ irqfd_wakeup(wait_queue_entry_t *wait, unsigned mode, int sync, void *key)
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{
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struct kvm_kernel_irqfd *irqfd =
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container_of(wait, struct kvm_kernel_irqfd, wait);
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unsigned long flags = (unsigned long)key;
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__poll_t flags = key_to_poll(key);
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struct kvm_kernel_irq_routing_entry irq;
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struct kvm *kvm = irqfd->kvm;
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unsigned seq;
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