Andrew, this should replace these patches in mm-hotfixes-unstable: 400922513f30 ("maple_tree: fix mas_skip_node() end slot detection") 4d4ec28ef3a4 ("test_maple_tree: add more testing for mas_empty_area()")
mas_empty_area() was incorrectly returning an error when there was room. The issue was tracked down to mas_skip_node() using the incorrect end-of-slot count. Instead of using the nodes hard limit, the limit of data should be used.
mas_skip_node() was also setting the min and max to that of the child node, which was unnecessary. Within these limits being set, there was also a bug that corrupted the maple state's max if the offset was set to the maximum node pivot. The bug was without consequence unless there was a sufficient gap in the next child node which would cause an error to be returned.
This patch set fixes these errors by removing the limit setting from mas_skip_node() and uses the mas_data_end() for slot limits, and adds tests for all failures discovered.
Liam R. Howlett (2): maple_tree: Fix mas_skip_node() end slot detection test_maple_tree: Add more testing for mas_empty_area()
lib/maple_tree.c | 24 +++++----------------- lib/test_maple_tree.c | 48 +++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 53 insertions(+), 19 deletions(-)