Merge tag 'uml-for-7.4' of git://git.kernel.org/pub/scm/linux/kernel/git/uml/linux

Pull UML updates from Johannes Berg:

 - NOMMU support, mostly for mm/ testing

   The only bigger change, we added support for building with
   !CONFIG_MMU, mostly for testing, e.g. via kunit. Some new
   selftests targetted to NOMMU are moving elsewhere, but are
   runnable on ARCH=um without MMU.

 - Tighter page permissions

   Tighten page permissions to catch more bugs (ARCH=um is,
   after all, often used for testing), and also mark __init
   memory inaccessible for the same reason.

 - Various maintenance/cleanups

   Fix build on really old hosts, fix leaks, make the code a
   bit more robust, header cleanups, typo fixes, the usual.

* tag 'uml-for-7.4' of git://git.kernel.org/pub/scm/linux/kernel/git/uml/linux: (38 commits)
  um: place large BSS inputs in an output section
  um: fix shutdown __inittext access
  um: time-travel: fix sched_yield() behaviour
  um: require MMU for UML PCI support
  um: vector: avoid NULL queue dereference in legacy RX mode
  um: use %pB to print functions in stack traces
  um: mprotect() __init memory
  um: move init text between __init_begin/end
  um: improve checking for --no-warn-rwx-segments
  um: make stub compilation more robust
  um: link .lbss/.ldata/.lrodata correctly
  um: add perf-event support
  x86/um: remove unused <asm/required-features.h> header
  um: fix typo "hander" in comment
  um: Add definition of __NR_close_range for older host OSs
  um: virtio_uml: switch to dynamic root device
  um: Tighten exec permissions on page mappings
  Documentation: um: document nommu UML
  um: allow deselecting CONFIG_MMU
  um: nommu: add userspace runner processes
  ...

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