[PATCH v2 0/2] xen/mm: Reset PFN_ORDER for offlined buddy heads

[Bernhard Kaindl <bernhard.kaindl@xxxxxxxxxx>]

This series fixes an inconsistency in the PFN_ORDER annotation for
pages that are offlined when they are the head of a free buddy.

When reserve_offlined_page() splits a buddy and moves offlined
sub-pages to the offlined lists, the former buddy head would be
left annotated with its original order even though it is now a
single page. While this does not cause functional regressions,
it is misleading.

You can pull this series with the regression test environment to run it:
$ git pull git@xxxxxxxxxx:bernhardkaindl/xen.git offline-head-order-v2
$ make -C tools/tests/native TARGETS=offline-head-order test

Signed-off-by: Bernhard Kaindl <bernhard.kaindl@xxxxxxxxxx>

Bernhard Kaindl (2):
  xen/mm: reset PFN_ORDER for offlined buddy heads
  tools/tests/native: Add test for offlined buddy head PFN_ORDER

 tools/tests/native/offline-head-order.c | 74 +++++++++++++++++++++++++
 xen/common/page_alloc.c                 |  6 ++
 2 files changed, 80 insertions(+)
 create mode 100644 tools/tests/native/offline-head-order.c

-- 
2.39.5