[GIT PULL] sched_ext: Fixes for v7.3-rc6

[Tejun Heo]

Hello,

The following changes since commit 94480606a677deb68d5622cf0ded88626514b3f2:

  sched_ext: Add a size argument to scx_bpf_cid_topo() so struct scx_cid_topo can grow (2026-09-26 10:09:12 -1000)

are available in the Git repository at:

  https://git.kernel.org/pub/scm/linux/kernel/git/tj/sched_ext.git tags/sched_ext-for-7.3-rc6-fixes

for you to fetch changes up to e6ac89b8b1c12e9104df45a14a26e2dfa96ded06:

  sched_ext: Generate qseq from a per-task counter (2026-10-03 13:23:31 -1000)

----------------------------------------------------------------
sched_ext: Fixes for v7.3-rc6

- Taking a CPU offline could hang, or stall until the watchdog ejected the
  BPF scheduler, when tasks on the dying CPU were still held by the
  scheduler or sitting on a user dispatch queue. Re-enqueue them onto the
  local queue when the runqueue goes offline so that the CPU pushes them off
  like the other sched classes.

- The sequence number guarding against stale dispatches was per runqueue, so
  a task re-enqueued on another CPU could get the same number and a dispatch
  meant for its earlier instance was applied to the new one. Use a per-task
  counter.

- A task dispatched to another CPU's local queue got its ops.dequeue() only
  when picked to run and flagged as a core-sched pick. Call it at insertion
  like for same-CPU dispatches.

----------------------------------------------------------------
Kuba Piecuch (3):
      sched_ext: Call ops.dequeue() when a task arrives on a remote local DSQ
      selftests/sched_ext: Add a test for ops.dequeue() on remote local DSQ moves
      sched_ext: Generate qseq from a per-task counter

Tejun Heo (1):
      sched_ext: Fix CPU hotplug hang when a dying CPU's tasks sit in the BPF scheduler

 include/linux/sched/ext.h                          |   1 +
 kernel/sched/ext/ext.c                             |  46 +++-
 kernel/sched/ext/inlines.h                         |   8 +-
 kernel/sched/ext/internal.h                        |   5 +
 kernel/sched/ext/sub.c                             |   4 -
 kernel/sched/sched.h                               |   6 +-
 tools/testing/selftests/sched_ext/Makefile         |   1 +
 .../selftests/sched_ext/dequeue_remote.bpf.c       | 270 +++++++++++++++++++++
 tools/testing/selftests/sched_ext/dequeue_remote.c | 204 ++++++++++++++++
 9 files changed, 528 insertions(+), 17 deletions(-)
 create mode 100644 tools/testing/selftests/sched_ext/dequeue_remote.bpf.c
 create mode 100644 tools/testing/selftests/sched_ext/dequeue_remote.c

-- 
tejun