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mmap: change zeroing of maple tree in __vma_adjust()
authorLiam R. Howlett <Liam.Howlett@Oracle.com>
Thu, 14 Apr 2022 06:07:15 +0000 (23:07 -0700)
committerLiam R. Howlett <Liam.Howlett@oracle.com>
Wed, 11 May 2022 13:09:53 +0000 (09:09 -0400)
commit5edfaae4883ea1e11e03ad227842b4d3ef4f0af6
treefe4f404ad4230dd10145f4bc032098e22732c4c8tree
parent78d205b2bcace9d1aec16e9d9315c5f1963875f8commit | diff
mmap: change zeroing of maple tree in __vma_adjust()

Only write to the maple tree if we are not inserting or the insert isn't
going to overwrite the area to clear.  This avoids spanning writes and
node coealescing when unnecessary.

The change requires a custom search for the linked list addition to find
the correct VMA for the prev link.

Signed-off-by: Liam R. Howlett <Liam.Howlett@oracle.com>
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