GPU drivers often need to create their own workqueues for various
reasons. Add the ability to do so.

Signed-off-by: Alice Ryhl <aliceryhl@google.com>
---
Changes in v4:
- Add link to delayed work fix.
- Redo workqueue creation to prevent invalid configurations.
- Introduce a directory as workqueue.rs was getting really large.
- Link to v3: https://lore.kernel.org/r/20260227-create-workqueue-v3-0-87de133f7849@google.com

Changes in v3:
- Switch to builder pattern.
- Drop BH workqueues for now.
- Mark delayed wq change as fix.
- Link to v2: https://lore.kernel.org/r/20251113-create-workqueue-v2-0-8b45277119bc@google.com

Changes in v2:
- Redo how flagging works.
- Restrict delayed work to not be usable on custom workqueues.
- Link to v1: https://lore.kernel.org/r/20250411-create-workqueue-v1-1-f7dbe7f1e05f@google.com

---
Alice Ryhl (3):
      rust: workqueue: restrict delayed work to global wqs
      rust: workqueue: create workqueue subdirectory
      rust: workqueue: add creation of workqueues

 MAINTAINERS                                    |   1 +
 rust/helpers/workqueue.c                       |   7 +
 rust/kernel/workqueue/builder.rs               | 380 +++++++++++++++++++++++++
 rust/kernel/{workqueue.rs => workqueue/mod.rs} |  53 +++-
 4 files changed, 437 insertions(+), 4 deletions(-)
---
base-commit: df9c51269a5e2a6fbca2884a756a4011a5e78748
change-id: 20250411-create-workqueue-d053158c7a4b

Best regards,
-- 
Alice Ryhl <aliceryhl@google.com>