From: Alok Tiwari <alok.a.tiwari@oracle.com>
Date: Sat, 18 Oct 2025 19:32:54 +0000 (-0700)
Subject: io_uring: fix incorrect unlikely() usage in io_waitid_prep()
X-Git-Tag: v6.18-rc3~21^2~6
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=4ec703ec0c384a2199808c4eb2e9037236285a8d;p=thirdparty%2Flinux.git

io_uring: fix incorrect unlikely() usage in io_waitid_prep()

The negation operator is incorrectly placed outside the unlikely()
macro:

    if (!unlikely(iwa))

This inverts the compiler branch prediction hint, marking the NULL case
as likely instead of unlikely. The intent is to indicate that allocation
failures are rare, consistent with common kernel patterns.

 Moving the negation inside unlikely():

    if (unlikely(!iwa))

Fixes: 2b4fc4cd43f2 ("io_uring/waitid: setup async data in the prep handler")
Signed-off-by: Alok Tiwari <alok.a.tiwari@oracle.com>
Reviewed-by: Gabriel Krisman Bertazi <krisman@suse.de>
Reviewed-by: Caleb Sander Mateos <csander@purestorage.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
---

diff --git a/io_uring/waitid.c b/io_uring/waitid.c
index f25110fb1b12..53532ae6256c 100644
--- a/io_uring/waitid.c
+++ b/io_uring/waitid.c
@@ -250,7 +250,7 @@ int io_waitid_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
 		return -EINVAL;
 
 	iwa = io_uring_alloc_async_data(NULL, req);
-	if (!unlikely(iwa))
+	if (unlikely(!iwa))
 		return -ENOMEM;
 	iwa->req = req;