From: Jens Axboe <axboe@kernel.dk>
To: io-uring@vger.kernel.org
Cc: andres@anarazel.de, Jens Axboe <axboe@kernel.dk>
Subject: [PATCH 8/9] io_uring: add end-of-bits marker and build time verify it
Date: Tue, 10 Mar 2020 09:04:25 -0600 [thread overview]
Message-ID: <20200310150427.28489-9-axboe@kernel.dk> (raw)
In-Reply-To: <20200310150427.28489-1-axboe@kernel.dk>
Not easy to tell if we're going over the size of bits we can shove
in req->flags, so add an end-of-bits marker and a BUILD_BUG_ON()
check for it.
Signed-off-by: Jens Axboe <axboe@kernel.dk>
---
fs/io_uring.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/fs/io_uring.c b/fs/io_uring.c
index 0760a0099760..f8a3f6843698 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -511,6 +511,9 @@ enum {
REQ_F_OVERFLOW_BIT,
REQ_F_POLLED_BIT,
REQ_F_BUFFER_SELECTED_BIT,
+
+ /* not a real bit, just to check we're not overflowing the space */
+ __REQ_F_LAST_BIT,
};
enum {
@@ -8006,6 +8009,7 @@ static int __init io_uring_init(void)
BUILD_BUG_SQE_ELEM(44, __s32, splice_fd_in);
BUILD_BUG_ON(ARRAY_SIZE(io_op_defs) != IORING_OP_LAST);
+ BUILD_BUG_ON(__REQ_F_LAST_BIT >= 8 * sizeof(int));
req_cachep = KMEM_CACHE(io_kiocb, SLAB_HWCACHE_ALIGN | SLAB_PANIC);
return 0;
};
--
2.25.1
next prev parent reply other threads:[~2020-03-10 15:04 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-03-10 15:04 [PATCHSET v4] Support for automatic buffer selection Jens Axboe
2020-03-10 15:04 ` [PATCH 1/9] io_uring: buffer registration infrastructure Jens Axboe
2020-03-10 15:04 ` [PATCH 2/9] io_uring: add IORING_OP_PROVIDE_BUFFERS Jens Axboe
2020-03-10 15:19 ` Jens Axboe
2020-03-10 15:04 ` [PATCH 3/9] io_uring: support buffer selection for OP_READ and OP_RECV Jens Axboe
2020-03-10 15:04 ` [PATCH 4/9] io_uring: add IOSQE_BUFFER_SELECT support for IORING_OP_READV Jens Axboe
2020-03-10 15:04 ` [PATCH 5/9] net: abstract out normal and compat msghdr import Jens Axboe
2020-03-10 15:04 ` [PATCH 6/9] io_uring: add IOSQE_BUFFER_SELECT support for IORING_OP_RECVMSG Jens Axboe
2020-03-10 15:04 ` [PATCH 7/9] io_uring: provide means of removing buffers Jens Axboe
2020-03-10 15:04 ` Jens Axboe [this message]
2020-03-10 15:04 ` [PATCH 9/9] io_uring: Fix unused function warnings Jens Axboe
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