*** This bug is a duplicate of bug 1674838 ***
https://bugs.launchpad.net/bugs/1674838
Please note that we did confirm this was caused by a couple of the
Power9 enablement patches from bug #1671613:
6e2a092a48d3 mm: introduce page_vma_mapped_walk()
3000e033152a mm, ksm: convert write_protect_page() to use
page_vma_mapped_walk()
These seem to only be providing context for the third patch:
c228a1037cd6 mm/ksm: handle protnone saved writes when making page
write protect
Based on the commit messages I don't believe they were intended to
provide any functional change. The first claims to only be introducing a
new interface, and the second says that write_protect_page() should use
the new interface "for consistency."
For that reason I've proposed we revert the patches and replace it with
a backport of c228a1037cd6 instead.
https://lists.ubuntu.com/archives/kernel-team/2017-May/083976.html
However 6e2a092a48d3 does contain some changes that seem unrelated to
the new interface, could you please advise whether or not these need to
be reapplied?
diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index 85742ac5b32e..a7bac4f2b78a 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -2129,9 +2129,12 @@ static void freeze_page(struct page *page)
static void unfreeze_page(struct page *page)
{
int i;
-
- for (i = 0; i < HPAGE_PMD_NR; i++)
- remove_migration_ptes(page + i, page + i, true);
+ if (PageTransHuge(page)) {
+ remove_migration_ptes(page, page, true);
+ } else {
+ for (i = 0; i < HPAGE_PMD_NR; i++)
+ remove_migration_ptes(page + i, page + i, true);
+ }
}
static void __split_huge_page_tail(struct page *head, int tail,
--
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https://bugs.launchpad.net/bugs/1680390
Title:
Ubuntu17.04: Kernel Oops: Exception in kernel mode, sig: 5 [#1] during
Avocado KVM Test runs [Regression]
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