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| author | Al Viro <viro@zeniv.linux.org.uk> | 2017-07-04 02:14:56 +0200 |
|---|---|---|
| committer | Al Viro <viro@zeniv.linux.org.uk> | 2017-11-27 22:19:54 +0100 |
| commit | 3ad6f93e98d6df25d0667d847d3ab9cbdccb3eae (patch) | |
| tree | 8b52d66806f02c815198e962758ac4199d9ee6e0 /fs/eventpoll.c | |
| parent | anntotate the places where ->poll() return values go (diff) | |
| download | linux-3ad6f93e98d6df25d0667d847d3ab9cbdccb3eae.tar.xz linux-3ad6f93e98d6df25d0667d847d3ab9cbdccb3eae.zip | |
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>
Diffstat (limited to 'fs/eventpoll.c')
| -rw-r--r-- | fs/eventpoll.c | 9 |
1 files changed, 5 insertions, 4 deletions
diff --git a/fs/eventpoll.c b/fs/eventpoll.c index afd548ebc328..21e6fee00e8b 100644 --- a/fs/eventpoll.c +++ b/fs/eventpoll.c @@ -1117,6 +1117,7 @@ static int ep_poll_callback(wait_queue_entry_t *wait, unsigned mode, int sync, v unsigned long flags; struct epitem *epi = ep_item_from_wait(wait); struct eventpoll *ep = epi->ep; + __poll_t pollflags = key_to_poll(key); int ewake = 0; spin_lock_irqsave(&ep->lock, flags); @@ -1138,7 +1139,7 @@ static int ep_poll_callback(wait_queue_entry_t *wait, unsigned mode, int sync, v * callback. We need to be able to handle both cases here, hence the * test for "key" != NULL before the event match test. */ - if (key && !((unsigned long) key & epi->event.events)) + if (pollflags && !(pollflags & epi->event.events)) goto out_unlock; /* @@ -1175,8 +1176,8 @@ static int ep_poll_callback(wait_queue_entry_t *wait, unsigned mode, int sync, v */ if (waitqueue_active(&ep->wq)) { if ((epi->event.events & EPOLLEXCLUSIVE) && - !((unsigned long)key & POLLFREE)) { - switch ((unsigned long)key & EPOLLINOUT_BITS) { + !(pollflags & POLLFREE)) { + switch (pollflags & EPOLLINOUT_BITS) { case POLLIN: if (epi->event.events & POLLIN) ewake = 1; @@ -1205,7 +1206,7 @@ out_unlock: if (!(epi->event.events & EPOLLEXCLUSIVE)) ewake = 1; - if ((unsigned long)key & POLLFREE) { + if (pollflags & POLLFREE) { /* * If we race with ep_remove_wait_queue() it can miss * ->whead = NULL and do another remove_wait_queue() after |