io_uring: fix incorrect __kernel_rwf_t cast
authorVasily Averin <vvs@openvz.org>
Thu, 19 May 2022 14:30:49 +0000 (17:30 +0300)
committerJens Axboe <axboe@kernel.dk>
Thu, 19 May 2022 18:27:59 +0000 (12:27 -0600)
commit0e7579ca732a39cc377e17509dda9bfc4f6ba78e
treee9e105f65ef31c21114bfa6f96c163391929f1be
parent2fcabce2d7d34f69a888146dab15b36a917f09d4
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>
include/trace/events/io_uring.h