The patchset fixes a bug of region_intersects() for systems with CXL memory. The details of the bug can be found in [1/3]. To avoid similar bugs in the future. A kunit test case for region_intersects() is added in [3/3]. [2/3] is a preparation patch for [3/3]. Changelogs: v3: - Revise the patch subject, description and comments, Thanks Bjorn, Andy, David, and Dan! - Added a kunit test case. - Fixed several coding style issues, Thanks Andy! - Link to v2: https://lore.kernel.org/linux-mm/20240819023413.1109779-1-ying.huang@xxxxxxxxx/ v2: - Fix a bug which occurs when descendant of a matched resource matches. - Revise the patch description and comments to make the algorithm clearer. Thanks Dan and David's comments! - Link to v1: https://lore.kernel.org/linux-mm/20240816020723.771196-1-ying.huang@xxxxxxxxx/ Best Regards, Huang, Ying
