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epoll: pull all code between fetch_events and send_event into the loop 

This is a no-op change which simplifies the follow up patches.

Link: https://lkml.kernel.org/r/20201106231635.3528496-7-soheil.kdev@gmail.com
Signed-off-by: Soheil Hassas Yeganeh <soheil@google.com>
Suggested-by: Linus Torvalds <torvalds@linux-foundation.org>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: Willem de Bruijn <willemb@google.com>
Reviewed-by: Khazhismel Kumykov <khazhy@google.com>
Cc: Guantao Liu <guantaol@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Soheil Hassas Yeganeh 2020-12-18 14:02:00 -08:00 committed by Linus Torvalds
parent 1493c47fb1
commit e8c85328b1
1 changed files with 22 additions and 21 deletions
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43
fs/eventpoll.c
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@ -1774,14 +1774,14 @@ static int ep_poll(struct eventpoll *ep, struct epoll_event __user *events,
} }
fetch_events: fetch_events:
eavail = ep_events_available(ep);
if (!eavail)
eavail = ep_busy_loop(ep, timed_out);
if (eavail)
goto send_events;
do { do {
eavail = ep_events_available(ep);
if (!eavail)
eavail = ep_busy_loop(ep, timed_out);
if (eavail)
goto send_events;
if (signal_pending(current)) if (signal_pending(current))
return -EINTR; return -EINTR;
@ -1830,21 +1830,22 @@ fetch_events:
* carefully under lock, below. * carefully under lock, below.
*/ */
eavail = 1; eavail = 1;
} while (0);
if (!list_empty_careful(&wait.entry)) { if (!list_empty_careful(&wait.entry)) {
write_lock_irq(&ep->lock); write_lock_irq(&ep->lock);
/* /*
* If the thread timed out and is not on the wait queue, it * If the thread timed out and is not on the wait queue,
* means that the thread was woken up after its timeout expired * it means that the thread was woken up after its
* before it could reacquire the lock. Thus, when wait.entry is * timeout expired before it could reacquire the lock.
* empty, it needs to harvest events. * Thus, when wait.entry is empty, it needs to harvest
*/ * events.
if (timed_out) */
eavail = list_empty(&wait.entry); if (timed_out)
__remove_wait_queue(&ep->wq, &wait); eavail = list_empty(&wait.entry);
write_unlock_irq(&ep->lock); __remove_wait_queue(&ep->wq, &wait);
} write_unlock_irq(&ep->lock);
}
} while (0);
send_events: send_events:
/* /*