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io_uring/eventfd: move actual signaling part into separate helper

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In preparation for using this from multiple spots, move the signaling
into a helper.

Link: https://lore.kernel.org/r/20240921080307.185186-4-axboe@kernel.dk
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Jens Axboe 2024-09-21 01:59:49 -06:00
parent 3c90b80df5
commit 60c5f15800
1 changed files with 18 additions and 10 deletions
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28
io_uring/eventfd.c
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@ -47,6 +47,22 @@ static void io_eventfd_put(struct io_ev_fd *ev_fd)
call_rcu(&ev_fd->rcu, io_eventfd_free);
}
/*
* Returns true if the caller should put the ev_fd reference, false if not.
*/
static bool __io_eventfd_signal(struct io_ev_fd *ev_fd)
{
if (eventfd_signal_allowed()) {
eventfd_signal_mask(ev_fd->cq_ev_fd, EPOLL_URING_WAKE);
return true;
}
if (!atomic_fetch_or(BIT(IO_EVENTFD_OP_SIGNAL_BIT), &ev_fd->ops)) {
call_rcu_hurry(&ev_fd->rcu, io_eventfd_do_signal);
return false;
}
return true;
}
void io_eventfd_signal(struct io_ring_ctx *ctx)
{
struct io_ev_fd *ev_fd = NULL;
@ -73,16 +89,8 @@ void io_eventfd_signal(struct io_ring_ctx *ctx)
return;
if (!refcount_inc_not_zero(&ev_fd->refs))
return;
if (likely(eventfd_signal_allowed())) {
eventfd_signal_mask(ev_fd->cq_ev_fd, EPOLL_URING_WAKE);
} else {
if (!atomic_fetch_or(BIT(IO_EVENTFD_OP_SIGNAL_BIT), &ev_fd->ops)) {
call_rcu_hurry(&ev_fd->rcu, io_eventfd_do_signal);
return;
}
}
io_eventfd_put(ev_fd);
if (__io_eventfd_signal(ev_fd))
io_eventfd_put(ev_fd);
}
void io_eventfd_flush_signal(struct io_ring_ctx *ctx)