maple_tree: make maple state reusable after mas_empty_area()

Make mas->min and mas->max point to a node range instead of a leaf entry
range.  This allows mas to still be usable after mas_empty_area() returns.
Users would get unexpected results from other operations on the maple
state after calling the affected function.

For example, x86 MAP_32BIT mmap() acts as if there is no suitable gap when
there should be one.

Link: https://lkml.kernel.org/r/[email protected]
Fixes: 54a611b60590 ("Maple Tree: add new data structure")
Signed-off-by: Peng Zhang <[email protected]>
Reported-by: "Edgecombe, Rick P" <[email protected]>
Reported-by: Tad <[email protected]>
Reported-by: Michael Keyes <[email protected]>
  Link: https://lore.kernel.org/linux-mm/[email protected]/
  Link: https://lore.kernel.org/linux-mm/[email protected]/
Reviewed-by: Liam R. Howlett <[email protected]>
Tested-by: Rick Edgecombe <[email protected]>
Cc: <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

0 files changed, 0 insertions, 0 deletions