io_uring: fix incorrect __kernel_rwf_t cast

Currently 'make C=1 fs/io_uring.o' generates sparse warning:

  CHECK   fs/io_uring.c
fs/io_uring.c: note: in included file (through
include/trace/trace_events.h, include/trace/define_trace.h, i
nclude/trace/events/io_uring.h):
./include/trace/events/io_uring.h:488:1:
 warning: incorrect type in assignment (different base types)
    expected unsigned int [usertype] op_flags
    got restricted __kernel_rwf_t const [usertype] rw_flags

This happen on cast of sqe->rw_flags which is defined as __kernel_rwf_t,
this type is bitwise and requires __force attribute for any casts.
However rw_flags is a member of the union, and its access can be safely
replaced by using of its neighbours, so let's use poll32_events to fix
the sparse warning.

Signed-off-by: Vasily Averin <vvs@openvz.org>
Link: https://lore.kernel.org/r/6f009241-a63f-ae43-a04b-62841aaef293@openvz.org
Signed-off-by: Jens Axboe <axboe@kernel.dk>

diff --git a/include/trace/events/io_uring.h b/include/trace/events/io_uring.h
index 42534ec..7cfd9c5 100644 (file)
--- 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       = sqe->poll32_events;
                __entry->buf_index      = sqe->buf_index;
                __entry->personality    = sqe->personality;
                __entry->file_index     = sqe->file_index;