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mm/mmap: use maple tree for unmapped_area{_topdown}
The maple tree code was added to find the unmapped area in a previous commit and was checked against what the rbtree returned, but the actual result was never used. Start using the maple tree implementation and remove the rbtree code. Add kernel documentation comment for these functions. Link: https://lkml.kernel.org/r/[email protected] Signed-off-by: Liam R. Howlett <[email protected]> Tested-by: Yu Zhao <[email protected]> Cc: Catalin Marinas <[email protected]> Cc: David Hildenbrand <[email protected]> Cc: David Howells <[email protected]> Cc: Davidlohr Bueso <[email protected]> Cc: "Matthew Wilcox (Oracle)" <[email protected]> Cc: SeongJae Park <[email protected]> Cc: Sven Schnelle <[email protected]> Cc: Vlastimil Babka <[email protected]> Cc: Will Deacon <[email protected]> Signed-off-by: Andrew Morton <[email protected]>
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