Simplify how the kmod dups code informs duplicate requests about the
result, fix a potential use-after-free when waiting on a duplicate request,
and make several general improvements to the code.

Note that the use-after-free fix depends on the code simplification
implemented in the first patch.

---
Changes in v3:
- Add received Reviewed-by tags.
- Rebase the series on modules-next.
- Link to v2: https://patch.msgid.link/20260723-module-stats-rcu-v2-0-bd582261fae3@suse.com

Changes in v2:
- Fix handling of concurrent request_module_nowait() and request_module()
  calls.
- Avoid unnecessary kmod_dup_req allocations.
- Avoid mixing goto with scope-based cleanup.
- Link to v1: https://patch.msgid.link/20260720121621.750661-1-petr.pavlu@suse.com

---
Petr Pavlu (6):
      module/dups: Inform duplicate requests about the result directly
      module/dups: Fix use-after-free in kmod_dup_req lifetime handling
      module/dups: Avoid unnecessary kmod_dup_req allocations
      module/dups: Use scope-based cleanup helpers
      module/dups: Use strcmp() to compare module names
      module/dups: Clean up includes

 kernel/module/dups.c | 169 +++++++++++++++++++++++----------------------------
 1 file changed, 77 insertions(+), 92 deletions(-)
---
base-commit: 2600d43b235b029d0ba4f2d3cc71e2137114fde3
change-id: 20260722-module-stats-rcu-ff0dfc986be6

On 8/6/26 11:10 AM, Petr Pavlu wrote:
> Simplify how the kmod dups code informs duplicate requests about the
> result, fix a potential use-after-free when waiting on a duplicate request,
> and make several general improvements to the code.
> 
> Note that the use-after-free fix depends on the code simplification
> implemented in the first patch.

I've queued the series on modules-next for v7.3-rc1.

-- Petr