From: Pavel Begunkov <asml.silence@gmail.com>
Date: Fri, 28 Feb 2020 07:36:38 +0000 (+0300)
Subject: io_uring: remove IO_WQ_WORK_CB
X-Git-Tag: v5.7-rc1~201^2~42
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=5eae8619907a1389dbd1b4a1049caf52782c0916;p=thirdparty%2Flinux.git

io_uring: remove IO_WQ_WORK_CB

IO_WQ_WORK_CB is used only for linked timeouts, which will be armed
before the work setup (i.e. mm, override creds, etc). The setup
shouldn't take long, so it's ok to arm it a bit later and get rid
of IO_WQ_WORK_CB.

Make io-wq call work->func() only once, callbacks will handle the rest.
i.e. the linked timeout handler will do the actual issue. And as a
bonus, it removes an extra indirect call.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
---

diff --git a/fs/io-wq.c b/fs/io-wq.c
index 39ed8751ea31d..a1a42ead3b5a6 100644
--- a/fs/io-wq.c
+++ b/fs/io-wq.c
@@ -479,9 +479,6 @@ next:
 		worker->cur_work = work;
 		spin_unlock_irq(&worker->lock);
 
-		if (work->flags & IO_WQ_WORK_CB)
-			work->func(&work);
-
 		if (work->files && current->files != work->files) {
 			task_lock(current);
 			current->files = work->files;
diff --git a/fs/io-wq.h b/fs/io-wq.h
index d500d88ab84e5..a0978d6958f03 100644
--- a/fs/io-wq.h
+++ b/fs/io-wq.h
@@ -7,7 +7,6 @@ enum {
 	IO_WQ_WORK_CANCEL	= 1,
 	IO_WQ_WORK_HASHED	= 4,
 	IO_WQ_WORK_UNBOUND	= 32,
-	IO_WQ_WORK_CB		= 128,
 	IO_WQ_WORK_NO_CANCEL	= 256,
 	IO_WQ_WORK_CONCURRENT	= 512,
 
diff --git a/fs/io_uring.c b/fs/io_uring.c
index 2a8d88c9bcab1..f999503854b77 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -2549,7 +2549,7 @@ static void io_link_work_cb(struct io_wq_work **workptr)
 	struct io_kiocb *link = work->data;
 
 	io_queue_linked_timeout(link);
-	work->func = io_wq_submit_work;
+	io_wq_submit_work(workptr);
 }
 
 static void io_wq_assign_next(struct io_wq_work **workptr, struct io_kiocb *nxt)
@@ -2559,7 +2559,6 @@ static void io_wq_assign_next(struct io_wq_work **workptr, struct io_kiocb *nxt)
 	io_prep_next_work(nxt, &link);
 	*workptr = &nxt->work;
 	if (link) {
-		nxt->work.flags |= IO_WQ_WORK_CB;
 		nxt->work.func = io_link_work_cb;
 		nxt->work.data = link;
 	}