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Add a way to return buffers synchronously via io_uring "register" syscall, which should serve as a slow fallback path. For a full branch with all relevant dependencies see https://github.com/isilence/linux.git zcrx/for-next Pavel Begunkov (2): io_uring/zcrx: introduce io_parse_rqe() io_uring/zcrx: allow synchronous buffer return include/uapi/linux/io_uring.h | 10 ++++ io_uring/register.c | 3 + io_uring/zcrx.c | 100 +++++++++++++++++++++++++++++----- io_uring/zcrx.h | 7 +++ 4 files changed, 107 insertions(+), 13 deletions(-) -- 2.49.0