sched_ext: Split sub-scheduler implementation into sub.c

The sub-scheduler implementation has grown and will continue to expand. Move
the sub-scheduler functions from ext.c into a new kernel/sched/ext/sub.c.
sub.h holds the prototypes and the !CONFIG_EXT_SUB_SCHED no-op stubs.

scx_dispatch_sched() is shared: balance_one() in ext.c and the
scx_bpf_sub_dispatch() kfunc in sub.c both call it, and the latter re-enters
it as sub-scheduler dispatch nests. It moves into sub.h as a static
__always_inline so both callers keep it inlined and per-level stack stays
bounded across the recursion. The event macros it uses move to internal.h.

No functional change.

Signed-off-by: Tejun Heo <tj@kernel.org>
Reviewed-by: Andrea Righi <arighi@nvidia.com>

0 files changed, 0 insertions, 0 deletions