[PATCHSET v2 sched_ext/for-7.3] sched_ext: Split sub-scheduler implementation into sub.c

[Tejun Heo <tj@kernel.org>]

Hello,

v2: Fold the scx_dispatch_sched() sub.h promotion into the split (patch 4) so
    it is self-contained. v1 left it to a later patch, so the posted split had
    sub.c call an ext.c file-local static (Andrea). __always_inline kept.
    Patches 1-3 unchanged.

v1: https://lore.kernel.org/all/20260701031429.1892218-1-tj@kernel.org

The sub-scheduler implementation has grown and will keep growing. Move it
out of ext.c into a new kernel/sched/ext/sub.c. The first three patches are
mechanical prep (prefix file-local helpers, expose shared internals, inline
a few trivial helpers) so the move itself stays pure code motion. No
functional change.

Based on sched_ext/for-7.3 (5df6a4506d06) with sched_ext/for-7.2-fixes
(b7d9c359e5cf) assumed merged.

Tejun Heo (4):
  sched_ext: Prefix file-local ext.c helpers exposed by the sub.c split
  sched_ext: Expose the ext.c internals used by the sub.c split
  sched_ext: Inline small ext.c helpers shared across the sub.c split
  sched_ext: Split sub-scheduler implementation into sub.c

 kernel/sched/build_policy.c |    2 +
 kernel/sched/ext/ext.c      | 1117 +++++--------------------------------------
 kernel/sched/ext/internal.h |  164 ++++++-
 kernel/sched/ext/sub.c      |  668 ++++++++++++++++++++++++++
 kernel/sched/ext/sub.h      |  161 +++++++
 5 files changed, 1101 insertions(+), 1011 deletions(-)

Thanks.

--
tejun