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

Pull sched_ext fixes from Tejun Heo:
 "This is a big pull for fixes, but much of it was in the works before
  the merge window.

  Most of these fixes are in sub-scheduler support, which nests BPF
  schedulers under a parent that hands them CPUs. It was heavily
  reworked over recent cycles and is now functionally complete. Porting
  real schedulers on it drove the latest additions and keeps finding
  corner cases.

  For example, once CPUs are shared and can be taken back, the kernel
  must keep every task moving when its scheduler can't run it or is
  failing, and those fallbacks interact subtly with each other and with
  other new core features.

   - The fallback paths meant to keep a task moving when its scheduler
     can't run it or is failing could themselves leave it stuck

   - The stall watchdog could blame a scheduler for time it wasn't
     responsible for, even taking down all of sched_ext

   - Sub-schedulers were told late, or not at all, which CPUs they could
     use

   - Deferred callbacks could stay queued or be dropped under core
     scheduling and proxy execution, with a sched/core fix to the
     duplicate check

   - Hardening: tracing programs can no longer call kfuncs that could
     deadlock the CPU"

* tag 'sched_ext-for-7.4-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/sched_ext: (34 commits)
  sched_ext: Reject scx_bpf_sub_grant/revoke() in tracing programs
  sched_ext: Fix the rescue overload pick ejecting the wrong sub under bypass
  sched_ext: Fix use-after-free of a NONE rescuee leaving its sched while running
  sched_ext: Fix a lone IMMED task waiting behind a kept prev
  sched_ext: Fix queued bypassed tasks stalling when the host loses SCX_CAP_BASE
  sched_ext: Let the bypass load balancer move tasks homed on other cpus
  sched_ext: Factor out bypass_lb_move() and insert with the donor DSQ unlocked
  sched_ext: Fix the bypass load balancer stranding tasks on cpus where the host lacks SCX_CAP_BASE
  sched_ext: Fix bypassed tasks stalling when the host lacks SCX_CAP_BASE
  sched_ext: Expire prev's slice in dispatch_one() under bypass
  sched_ext: Fix a cpu idling after put_prev_task_scx() queues its task on the local DSQ
  sched_ext: Refuse extending a kernel slice
  sched_ext: Mark the rescue grant as a kernel slice with SCX_TASK_KERNEL_SLICE
  sched_ext: Fix a cpu idling with a runnable rescuee
  sched_ext: Restore a rescuee's slice after ops.stopping()
  sched_ext: Fix rescue served time disagreeing with the slice under proxy execution
  sched_ext: Move refill_task_slice_dfl() below apply_slice_vtime()
  sched_ext: Fix bypassed tasks looping on a host without SCX_CAP_ENQ
  sched_ext: Fix bypassed tasks stranded by the reenqueue limit
  sched_ext: Clear holding_cpu where the claim is confirmed
  ...

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