Merge tag 'for-7.0/io_uring-20260206' of git://git.kernel.org/pub/scm/linux/kernel/git/axboe/linux

Pull io_uring updates from Jens Axboe:

 - Clean up the IORING_SETUP_R_DISABLED and submitter task checking,
   mostly just in preparation for relaxing the locking for SINGLE_ISSUER
   in the future.

 - Improve IOPOLL by using a doubly linked list to manage completions.

   Previously it was singly listed, which meant that to complete request
   N in the chain 0..N-1 had to have completed first. With a doubly
   linked list we can complete whatever request completes in that order,
   rather than need to wait for a consecutive range to be available.
   This reduces latencies.

 - Improve the restriction setup and checking. Mostly in preparation for
   adding further features on top of that. Coming in a separate pull
   request.

 - Split out task_work and wait handling into separate files. These are
   mostly nicely abstracted already, but still remained in the
   io_uring.c file which is on the larger side.

 - Use GFP_KERNEL_ACCOUNT in a few more spots, where appropriate.

 - Ensure even the idle io-wq worker exits if a task no longer has any
   rings open.

 - Add support for a non-circular submission queue.

   By default, the SQ ring keeps moving around, even if only a few
   entries are used for each submission. This can be wasteful in terms
   of cachelines.

   If IORING_SETUP_SQ_REWIND is set for the ring when created, each
   submission will start at offset 0 instead of where we last left off
   doing submissions.

 - Various little cleanups

* tag 'for-7.0/io_uring-20260206' of git://git.kernel.org/pub/scm/linux/kernel/git/axboe/linux: (30 commits)
  io_uring/kbuf: fix memory leak if io_buffer_add_list fails
  io_uring: Add SPDX id lines to remaining source files
  io_uring: allow io-wq workers to exit when unused
  io_uring/io-wq: add exit-on-idle state
  io_uring/net: don't continue send bundle if poll was required for retry
  io_uring/rsrc: use GFP_KERNEL_ACCOUNT consistently
  io_uring/futex: use GFP_KERNEL_ACCOUNT for futex data allocation
  io_uring/io-wq: handle !sysctl_hung_task_timeout_secs
  io_uring: fix bad indentation for setup flags if statement
  io_uring/rsrc: take unsigned index in io_rsrc_node_lookup()
  io_uring: introduce non-circular SQ
  io_uring: split out CQ waiting code into wait.c
  io_uring: split out task work code into tw.c
  io_uring/io-wq: don't trigger hung task for syzbot craziness
  io_uring: add IO_URING_EXIT_WAIT_MAX definition
  io_uring/sync: validate passed in offset
  io_uring/eventfd: remove unused ctx->evfd_last_cq_tail member
  io_uring/timeout: annotate data race in io_flush_timeouts()
  io_uring/uring_cmd: explicitly disallow cancelations for IOPOLL
  io_uring: fix IOPOLL with passthrough I/O
  ...

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