[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
1 file changed
tree: 48fa91ddaa5b5de865194c0984a6cb46c88e8de4
  1. ctf/
  2. git-hooks/
  3. infra/
  4. third_party/
  5. flower
  6. jiri.lock
  7. MILESTONE
  8. minimal
  9. prebuilts
  10. README.md
  11. stem
  12. test_durations
README.md

Integration

This repository contains Fuchsia's Global Integration manifest files.

Making changes

All changes should be made to the internal version of this repository. Our infrastructure automatically updates this version when the internal one changes.

Currently all changes must be made by a Google employee. Non-Google employees wishing to make a change can ask for assistance in one of the communication channels documented at get involved.

Obtaining the source

First install Jiri.

Next run:

$ jiri init
$ jiri import minimal https://fuchsia.googlesource.com/integration
$ jiri update

Third party

Third party projects should have their own subdirectory in ./third_party.