Re: [PATCH] mm/huge_memory: softleaf device private fixes in remove_migration_pmd()

From: David Hildenbrand (Red Hat)

Date: Wed Nov 12 2025 - 06:37:54 EST


On 12.11.25 05:46, Balbir Singh wrote:
commit a6ca2ba46390 ("mm: replace pmd_to_swp_entry() with softleaf_from_pmd()")

So should this be squashed into Lorenzo patch, or incorporated in his series in case he has to resend?

does not work with device private THP entries. softleaf_is_migration_young()
asserts that the entry be a migration entry, but in the current code, the
entry might already be replaced by a device private entry by the time the
check is made. The issue exists with commit
7385dbdbf841 ("mm/rmap: extend rmap and migration support device-private entries")


Because this confuses me. If it's already a problem in the commit-to-go-upstream-first, it should be fixed in that commit?

--
Cheers

David