From 6878b40e7b28bd780dedb7d505c13dbf82b73290 Mon Sep 17 00:00:00 2001
From: Pavel Begunkov <asml.silence@gmail.com>
Date: Fri, 24 Sep 2021 21:59:41 +0100
Subject: [PATCH] io_uring: mark having different creds unlikely
Git-commit: 6878b40e7b28bd780dedb7d505c13dbf82b73290
Patch-mainline: v5.16-rc1
References: bsc#1205205
Hint the compiler that it's not as likely to have creds different from
current attached to a request. The current code generation is far from
ideal, hopefully it can help to some compilers to remove duplicated jump
tables and so.
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/e7815251ac4bf5a4a23d298c752f029ae19f3837.1632516769.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Gabriel Krisman Bertazi <krisman@suse.de>
---
fs/io_uring.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/fs/io_uring.c b/fs/io_uring.c
index 3ced6a7bdf2b..bda302bedeef 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -6638,7 +6638,7 @@ static int io_issue_sqe(struct io_kiocb *req, unsigned int issue_flags)
const struct cred *creds = NULL;
int ret;
- if ((req->flags & REQ_F_CREDS) && req->creds != current_cred())
+ if (unlikely((req->flags & REQ_F_CREDS) && req->creds != current_cred()))
creds = override_creds(req->creds);
switch (req->opcode) {
--
2.35.3