From: Pavel Begunkov Date: Fri, 24 Sep 2021 20:59:41 +0000 (+0100) Subject: io_uring: mark having different creds unlikely X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=6878b40e7b28bd780dedb7d505c13dbf82b73290;p=linux.git io_uring: mark having different creds unlikely 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 Link: https://lore.kernel.org/r/e7815251ac4bf5a4a23d298c752f029ae19f3837.1632516769.git.asml.silence@gmail.com Signed-off-by: Jens Axboe --- diff --git a/fs/io_uring.c b/fs/io_uring.c index 3ced6a7bdf2b5..bda302bedeeff 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) {