[PATCH 0/2] XArray multi-index tests

[Daniel Gomez]

Add multi-index XArray tests.

Tests were first introduced as part of '[RFC PATCH 00/11] shmem: high
order folios support in write path' [1]. I've created this new series with
Matthew Wilcox's feedback [2] regarding test 'XArray: add cmpxchg order test'.

[1] https://lore.kernel.org/all/20231028211518.3424020-1-da.gomez@xxxxxxxxxxx/
[2] https://lore.kernel.org/all/ZT68dBiJKNLXLRZA@xxxxxxxxxxxxxxxxxxxx/

The full node is lost (not only the order) when using xa_cmpxchg with NULL
entry. Adding another (FIVE) entry at '1 << order' with the order information
does not keep the original node but duplicates it. I'm not sure if that's
the intention from the proposal you mentioned in [2] but please, let me know
your comments.

Changes since RFC:
* Update cmpxchg test to include another entry at 1 << order that
'keeps' the node around and order information.
* Update cmpxchg test to verify the entries and order in all tied
indexes.
* Drop previous Luis Chamberlain's review as changes are significant
from the RFC.

Daniel

Daniel Gomez (1):
  XArray: add cmpxchg order test

Luis Chamberlain (1):
  test_xarray: add tests for advanced multi-index use

 lib/test_xarray.c | 188 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 188 insertions(+)

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2.39.2