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* [PATCH] sparse: use force attribute for __kernel_rwf_t casts
@ 2022-05-14 16:23 Vasily Averin
  2022-05-14 20:53 ` Jens Axboe
  2022-05-16  6:28 ` Christoph Hellwig
  0 siblings, 2 replies; 8+ messages in thread
From: Vasily Averin @ 2022-05-14 16:23 UTC (permalink / raw)
  To: Jens Axboe, Pavel Begunkov
  Cc: kernel, linux-kernel, Steven Rostedt, Ingo Molnar, io-uring

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 <[email protected]>
---
 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


^ permalink raw reply related	[flat|nested] 8+ messages in thread

end of thread, other threads:[~2022-05-19 18:28 UTC | newest]

Thread overview: 8+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2022-05-14 16:23 [PATCH] sparse: use force attribute for __kernel_rwf_t casts Vasily Averin
2022-05-14 20:53 ` Jens Axboe
2022-05-16  6:28 ` Christoph Hellwig
2022-05-18  9:20   ` [PATCH v2] io_uring: fix sparce warnings about " Vasily Averin
2022-05-19  7:03     ` Christoph Hellwig
2022-05-19 12:13       ` Jens Axboe
2022-05-19 14:30         ` [PATCH v3] io_uring: fix incorrect __kernel_rwf_t cast Vasily Averin
2022-05-19 18:28           ` Jens Axboe

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