Merge tag 'io_uring-6.15-20250410' of git://git.kernel.dk/linux

Pull io_uring fixes from Jens Axboe:

 - Reject zero sized legacy provided buffers upfront. No ill side
   effects from this one, only really done to shut up a silly syzbot
   test case.

 - Fix for a regression in tag posting for registered files or buffers,
   where the tag would be posted even when the registration failed.

 - two minor zcrx cleanups for code added this merge window.

* tag 'io_uring-6.15-20250410' of git://git.kernel.dk/linux:
  io_uring/kbuf: reject zero sized provided buffers
  io_uring/zcrx: separate niov number from pages
  io_uring/zcrx: put refill data into separate cache line
  io_uring: don't post tag CQEs on file/buffer registration failure