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mmap: Change zeroing of maple tree in __vma_adjust()
authorLiam R. Howlett <Liam.Howlett@oracle.com>
Mon, 6 Sep 2021 03:31:15 +0000 (23:31 -0400)
committerLiam R. Howlett <Liam.Howlett@oracle.com>
Mon, 14 Mar 2022 18:49:44 +0000 (14:49 -0400)
commit5faa0b06bad5522004d312e187ef769a12575e59
treeb31376c232e6a19093979c467c9bb15d7703d303tree
parenta16a814ad98780849ab9b641dc18d2f9a27a500bcommit | 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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