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

Pull sched_ext updates from Tejun Heo:

 - Proxy execution can now be enabled together with sched_ext. A BPF
   scheduler can opt in to receive mutex-blocked tasks that donate their
   scheduling context to the lock owner and place them itself.

 - Lazy preemption: a BPF scheduler can preempt or kick a CPU lazily,
   deferring the switch to the next return to user space or tick, as the
   fair class can.

 - Sub-schedulers: a parent now learns which child runs on each CPU it
   delegated and when a cap change takes effect. A detaching child loses
   its caps before the parent restores the CPUs.

 - New kfuncs re-enqueue single tasks from a dispatch queue iteration
   and report a cgroup's CPU count and a CID's NUMA node. The CID
   topology now includes clusters.

 - Hot path optimizations: dispatch queue and task lookups compare keys
   inline, remote task moves no longer take a dispatch queue lock twice,
   and sub-scheduler hooks cost nothing without sub-schedulers.

 - Kfuncs callable from tracing programs are hardened against NMI and
   IRQ nesting, which could hard-lock the CPU or pick a wrong idle CPU.

 - Built-in dispatch queues no longer allocate per-CPU state that grew
   with the square of the CPU count.

 - Header syncs with the scx repo, a BTF workaround for pahole 1.32, and
   selftest fixes and coverage.

* tag 'sched_ext-for-7.4' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/sched_ext: (69 commits)
  sched_ext: Drop the locks periodically while walking a user DSQ for re-enqueue
  sched_ext: scx_qmap: Also re-enqueue stranded tasks with scx_bpf_dsq_reenq_task()
  sched_ext: Add scx_bpf_dsq_reenq_task() to re-enqueue single tasks from a DSQ iteration
  sched_ext: Factor out the rq lock switch of scx_dsq_move()
  sched_ext: Don't queue balance callbacks from a core-sched pick
  sched_ext: Don't leave balance callbacks queued across a pick retry
  sched_ext: Fix a bypassed task stalling on a cpu its scheduler has no caps on
  sched_ext: Fix the running task keeping its protection into bypass
  sched_ext: Fix use-after-free of a local reenq node left on an inactive cpu
  sched_ext: Keep proxy donors with slice left on the local DSQ
  selftests/sched_ext: Report reload_loop attach failures
  selftests/sched_ext: Bound exit waits
  selftests/sched_ext: Add SCX_ASSERT_ALIVE and adopt it
  selftests/sched_ext: Fail loudly when EXIT_KIND is missing from BTF
  sched_ext: Add SCX_ECODE_RSN_CGROUP_OFFLINE to user_exit_info.h
  selftests/sched_ext: Fix reload_loop error-path use-after-free
  selftests/sched_ext: Fix build error in dequeue_remote selftest
  sched_ext: scx_qmap: Reset a child's cpuperf targets once its PERF revoke takes effect
  sched_ext: Add ops.sub_child_ecaps_updated() to report a child's effective cap changes
  sched_ext: scx_qmap: Show actual cid use per participant
  ...

1 files changed, 0 insertions, 2 deletions

diff --git a/init/Kconfig b/init/Kconfig
index 046ae0bf1186..b31aa298c4fe 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -743,8 +743,6 @@ config SCHED_PROXY_EXEC
 	bool "Proxy Execution"
 	# Avoid some build failures w/ PREEMPT_RT until it can be fixed
 	depends on !PREEMPT_RT
-	# Need to investigate how to inform sched_ext of split contexts
-	depends on !SCHED_CLASS_EXT
 	# Not particularly useful until we get to multi-rq proxying
 	depends on EXPERT
 	help