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mmap: change zeroing of maple tree in __vma_adjust()
authorLiam R. Howlett <Liam.Howlett@Oracle.com>
Wed, 20 Jul 2022 02:17:49 +0000 (02:17 +0000)
committerLiam R. Howlett <Liam.Howlett@oracle.com>
Tue, 6 Sep 2022 19:44:22 +0000 (15:44 -0400)
commit8193dd525c9eab88705292fe69e2685805db74e5
tree5239b9874a58a2503f3a2e12f7b808f6f228e23btree
parent43c92b31343e1fef0af5f3e0ba158c21b84f9cfccommit | 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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