[PATCH liburing 0/2] liburing IORING_SETUP_NO_SQARRAY support

[Pavel Begunkov <asml.silence@gmail.com>]

Patch 1 adds support for IORING_SETUP_NO_SQARRAY, i.e. not using and
mmaping the first SQ indirection level sq_array.

Patch 2 defaults liburing to using IORING_SETUP_NO_SQARRAY. If it's
not supported by the kernel we'll fallback to a setup without the
flag. If the user specifically asks for IORING_SETUP_NO_SQARRAY,
it'll also fail if the feature is unsupported.

Note: two tests need sqarray, and so there is a new helper
__io_uring_queue_init_params(), which is not static but not
exported by the library. Further, we don't declare it in
liburing.h but only under tests to prevent misuse.

Pavel Begunkov (2):
  setup: add IORING_SETUP_NO_SQARRAY support
  setup: default to IORING_SETUP_NO_SQARRAY

 src/include/liburing/io_uring.h |  5 ++++
 src/setup.c                     | 42 +++++++++++++++++++++++++--------
 test/accept-reuse.c             |  2 +-
 test/helpers.h                  | 13 ++++++++++
 test/io_uring_enter.c           |  7 ++++--
 5 files changed, 56 insertions(+), 13 deletions(-)

-- 
2.41.0