[PATCH 0/4] sched_ext: Decompose scx_cid_init()

[Zhang Qiao <zhangqiao22@huawei.com>]

scx_cid_init() grew into a ~230-line monolith interleaving table
allocation, the node/LLC/cluster/core topology walk, the no-topo tail
and the shard range finalization. This series decomposes it into stage
helpers sharing a file-private builder struct, in four individually
compilable steps:

  01/04 extract the no-topo tail and the table finalization
  02/04 collect the construction state in scx_cid_builder
  03/04 extract the construction of a single LLC cid range
  04/04 extract the online (node-level) walk

No behavior change: WARN checks, error paths, shard policy and
publication timing are all preserved. This is preparation for
follow-up fixes to the partial-SMT core counting in
calc_shard_layout() and the single-core shard hard-cap corner case,
which are deliberately kept out to keep this series a pure code
motion.

Based on tj/sched_ext for-7.5.

Signed-off-by: Zhang Qiao <zhangqiao22@huawei.com>

Zhang Qiao (4):
  sched_ext: Extract no-topology CID construction and table finalization
  sched_ext: Collect CID construction state in a private builder
  sched_ext: Extract construction of a single LLC CID range
  sched_ext: Extract online CID construction from scx_cid_init

 kernel/sched/ext/cid.c | 422 +++++++++++++++++++++++------------------
 1 file changed, 241 insertions(+), 181 deletions(-)


base-commit: beb427129cbdd0154cdb017a694779963e46b520
-- 
2.43.0