linux-kernel - [PATCH] sparse: use force attribute for __kernel_rwf

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Message-ID: <45e8576e-5fcc-bc52-8805-0b5cc3fc1a84@openvz.org>
Date:   Sat, 14 May 2022 19:23:29 +0300
From:   Vasily Averin <vvs@...nvz.org>
To:     Jens Axboe <axboe@...nel.dk>,
        Pavel Begunkov <asml.silence@...il.com>
Cc:     kernel@...nvz.org, linux-kernel@...r.kernel.org,
        Steven Rostedt <rostedt@...dmis.org>,
        Ingo Molnar <mingo@...hat.com>, io-uring@...r.kernel.org
Subject: [PATCH] sparse: use force attribute for __kernel_rwf_t casts

Fixes sparse warnings:
fs/io_uring.c: note: in included file (through include/trace/perf.h,
include/trace/define_trace.h, include/trace/events/io_uring.h):
./include/trace/events/io_uring.h:488:1: sparse:
 warning: incorrect type in assignment (different base types)
    expected unsigned int [usertype] op_flags
    got restricted __kernel_rwf_t const [usertype] rw_flags
fs/io_uring.c:3164:23: sparse:
 warning: incorrect type in assignment (different base types)
    expected unsigned int [usertype] flags
    got restricted __kernel_rwf_t
fs/io_uring.c:3769:48: sparse:
 warning: incorrect type in argument 2 (different base types)
    expected restricted __kernel_rwf_t [usertype] flags
    got unsigned int [usertype] flags

__kernel_rwf_t type is bitwise and requires __force attribute for casts

Signed-off-by: Vasily Averin <vvs@...nvz.org>
---
 fs/io_uring.c                   | 4 ++--
 include/trace/events/io_uring.h | 2 +-
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/fs/io_uring.c b/fs/io_uring.c
index 91de361ea9ab..5ca4a6e91884 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -3161,7 +3161,7 @@ static int io_prep_rw(struct io_kiocb *req, const struct io_uring_sqe *sqe)
 	req->imu = NULL;
 	req->rw.addr = READ_ONCE(sqe->addr);
 	req->rw.len = READ_ONCE(sqe->len);
-	req->rw.flags = READ_ONCE(sqe->rw_flags);
+	req->rw.flags = (__force u32)READ_ONCE(sqe->rw_flags);
 	req->buf_index = READ_ONCE(sqe->buf_index);
 	return 0;
 }
@@ -3766,7 +3766,7 @@ static int io_rw_init_file(struct io_kiocb *req, fmode_t mode)
 		req->flags |= io_file_get_flags(file) << REQ_F_SUPPORT_NOWAIT_BIT;
 
 	kiocb->ki_flags = iocb_flags(file);
-	ret = kiocb_set_rw_flags(kiocb, req->rw.flags);
+	ret = kiocb_set_rw_flags(kiocb, (__force rwf_t)req->rw.flags);
 	if (unlikely(ret))
 		return ret;
 
diff --git a/include/trace/events/io_uring.h b/include/trace/events/io_uring.h
index cddf5b6fbeb4..df4b89a79764 100644
--- a/include/trace/events/io_uring.h
+++ b/include/trace/events/io_uring.h
@@ -520,7 +520,7 @@ TRACE_EVENT(io_uring_req_failed,
 		__entry->off		= sqe->off;
 		__entry->addr		= sqe->addr;
 		__entry->len		= sqe->len;
-		__entry->op_flags	= sqe->rw_flags;
+		__entry->op_flags	= (__force u32)sqe->rw_flags;
 		__entry->buf_index	= sqe->buf_index;
 		__entry->personality	= sqe->personality;
 		__entry->file_index	= sqe->file_index;
-- 
2.31.1