From 5655455a06b8d17285df320dd1bce19d37392fa9 Mon Sep 17 00:00:00 2001 From: Pavel Begunkov Date: Sun, 17 Oct 2021 00:07:08 +0100 Subject: [PATCH] io_uring: arm poll for non-nowait files commit e74ead135bc4459f7d40b1f8edab1333a28b54e8 upstream. Don't check if we can do nowait before arming apoll, there are several reasons for that. First, we don't care much about files that don't support nowait. Second, it may be useful -- we don't want to be taking away extra workers from io-wq when it can go in some async. Even if it will go through io-wq eventually, it make difference in the numbers of workers actually used. And the last one, it's needed to clean nowait in future commits. [kernel test robot: fix unused-var] Signed-off-by: Pavel Begunkov Link: https://lore.kernel.org/r/9d06f3cb2c8b686d970269a87986f154edb83043.1634425438.git.asml.silence@gmail.com Signed-off-by: Jens Axboe Signed-off-by: Greg Kroah-Hartman --- fs/io_uring.c | 7 ------- 1 file changed, 7 deletions(-) diff --git a/fs/io_uring.c b/fs/io_uring.c index 7aad4bd..b8e6398 100644 --- a/fs/io_uring.c +++ b/fs/io_uring.c @@ -5662,7 +5662,6 @@ static int io_arm_poll_handler(struct io_kiocb *req) struct async_poll *apoll; struct io_poll_table ipt; __poll_t ret, mask = EPOLLONESHOT | POLLERR | POLLPRI; - int rw; if (!req->file || !file_can_poll(req->file)) return IO_APOLL_ABORTED; @@ -5672,7 +5671,6 @@ static int io_arm_poll_handler(struct io_kiocb *req) return IO_APOLL_ABORTED; if (def->pollin) { - rw = READ; mask |= POLLIN | POLLRDNORM; /* If reading from MSG_ERRQUEUE using recvmsg, ignore POLLIN */ @@ -5680,14 +5678,9 @@ static int io_arm_poll_handler(struct io_kiocb *req) (req->sr_msg.msg_flags & MSG_ERRQUEUE)) mask &= ~POLLIN; } else { - rw = WRITE; mask |= POLLOUT | POLLWRNORM; } - /* if we can't nonblock try, then no point in arming a poll handler */ - if (!io_file_supports_nowait(req, rw)) - return IO_APOLL_ABORTED; - apoll = kmalloc(sizeof(*apoll), GFP_ATOMIC); if (unlikely(!apoll)) return IO_APOLL_ABORTED; -- 2.7.4