[roll] Roll fuchsia Reland "[kernel][vm] Separately handle contiguous VMOs in ZeroPagesLocked" This is a reland of commit cf3cdb93b453baa3ecfea0f98074268ccc09fb32 This can be relanded because its parent, I88aa586a11cd88109d9ce669d972219370dd5554, includes the fix for the initial failure. See the description of this change for more about the failure. Original change's description: > Break out the contiguous (direct_source_supplies_zero_pages) case from > ZeroPagesLocked to its own helper method. > > We move most of the logic from ZeroPagesLocked to a new > ZeroPagesNoDirectPageSourceLocked. Because this method can assume there > is no direct page source, several conditions are eliminated or become > simpler. > > This is part of a larger effort to simplify VmCowPages::ZeroPagesLocked. > > Original-Fixed: 456572308 > Original-Bug: 423017076 > Change-Id: I12e02d1e8c6811a1fd9507e57f486f93b6f4f3dc > Original-Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/1409457 > Reviewed-by: Adrian Danis <adanis@google.com> > Commit-Queue: Ethan Williams <ethanws@google.com> Original-Fixed: 456572308 Original-Bug: 423017076 Original-Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/1417035 Original-Revision: c67c39df581fd7d3c98ec2158d19967fa606c1ff GitOrigin-RevId: 482315c20851db0ce5aaa227ca48444181598753 Change-Id: If02756dce1d367916ec215834a0c5a51074c48b2
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