[PATCH v3 0/4] module: Merge same-name module load requests

[Petr Pavlu]

Changes since v2 [1]:
- Add kselftests to verify the expected behavior.
- Split a clean-up change to the module_mutex comment into a separate patch.
- Clarify a description of the main patch and mention that it fixes also
  a recently reported problem with module vmap space allocation errors.
- Improve some code comments.

Changes since v1 [2]:
- Change the error returned by a duplicate load when the main insert
  fails from -ENODEV to -EBUSY.
- Change the error returned by a duplicate load when a same-name module
  is going from -EAGAIN to -EBUSY.
- Use a per-shared_load_info completion object to inform waiting loads
  when the main one is done.
- Add a patch to correct wake up of module_wq.

[1] https://lore.kernel.org/linux-modules/20220919123233.8538-1-petr.pavlu@xxxxxxxx/
[2] https://lore.kernel.org/linux-modules/20220905084131.14567-1-petr.pavlu@xxxxxxxx/

Petr Pavlu (4):
  module: Correct wake up of module_wq
  module: Update a comment describing what is protected by module_mutex
  module: Merge same-name module load requests
  selftests: kmod: Add tests for merging same-name module load requests

 kernel/module/main.c                          | 222 +++++++++++++-----
 tools/testing/selftests/kmod/.gitignore       |   1 +
 tools/testing/selftests/kmod/Makefile         |  17 +-
 tools/testing/selftests/kmod/init_module.c    |  49 ++++
 tools/testing/selftests/kmod/kmod.sh          | 139 +++++++++++
 .../selftests/kmod/kmod_test_0014/Makefile    |  14 ++
 .../kmod/kmod_test_0014/kmod_test_0014.c      |  29 +++
 7 files changed, 402 insertions(+), 69 deletions(-)
 create mode 100644 tools/testing/selftests/kmod/.gitignore
 create mode 100644 tools/testing/selftests/kmod/init_module.c
 create mode 100644 tools/testing/selftests/kmod/kmod_test_0014/Makefile
 create mode 100644 tools/testing/selftests/kmod/kmod_test_0014/kmod_test_0014.c

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2.35.3