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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>
Fri, 11 Feb 2022 03:38:06 +0000 (22:38 -0500)
commit5b1a9e9b7226f537db053a974f9a0595d12cf7fd
tree6a24842ab1a30314d0bc9739f1f9da61d859da55tree
parentb2adabbf3788468a75c2da8385226834af430acbcommit | 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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