[PATCH 6.12.y v2 0/5] backport missing dependencies of d66792919d4f

Commit d66792919d4f ("sched/deadline: Use revised wakeup rule for
dl_server") in the 6.12.y stable tree (upstream commit 14a857056466)
depends on five upstream commits that were not backported:

  commit cccb45d7c429 ("sched/deadline: Less agressive dl_server handling")
  commit 4717432dfd99 ("sched/deadline: Fix dl_server_stopped()")
  commit bb4700adc3ab ("sched/deadline: Always stop dl-server before changing parameters")
  commit 4ae8d9aa9f9d ("sched/deadline: Fix dl_server getting stuck")
  commit a3a70caf7906 ("sched/deadline: Fix dl_server behaviour")

Without these, cyclictest under load reports latencies up to ~50ms on
PREEMPT_RT.

For context, see the regression report:
https://lore.kernel.org/regressions/[email protected]

Testing:
Tested on two different machines with Debian's PREEMPT_RT config for about
10 hours.
Without these patches cyclictest under load spikes to ~50ms in less than
30 minutes, with the series applied the latency spikes are gone.

Thanks,
Lukas

v1: https://lore.kernel.org/stable/[email protected]/

v1 -> v2:
 - Also pick up
   4717432dfd99 ("sched/deadline: Fix dl_server_stopped()") and
   bb4700adc3ab ("sched/deadline: Always stop dl-server before changing parameters")
 - drop the conflict resolution from a3a70caf7906 as it applies cleanly now

Huacai Chen (1):
  sched/deadline: Fix dl_server_stopped()

Juri Lelli (1):
  sched/deadline: Always stop dl-server before changing parameters

Peter Zijlstra (3):
  sched/deadline: Less agressive dl_server handling
  sched/deadline: Fix dl_server getting stuck
  sched/deadline: Fix dl_server behaviour

 include/linux/sched.h   |  1 -
 kernel/sched/deadline.c | 16 +++-------------
 kernel/sched/debug.c    |  6 ++----
 kernel/sched/fair.c     | 16 +---------------
 kernel/sched/sched.h    | 37 +++++++++++++++++++++++++++++++------
 5 files changed, 37 insertions(+), 39 deletions(-)

-- 
2.54.0