Re: [PATCH V2 for 6.6] mm/migrate: correct nr_failed in migrate_pages_sync()

[Sasha Levin <sashal@kernel.org>]

[ Sasha's backport helper bot ]

Hi,

✅ All tests passed successfully. No issues detected.
No action required from the submitter.

The upstream commit SHA1 provided is correct: a259945efe6ada94087ef666e9b38f8e34ea34ba

WARNING: Author mismatch between patch and upstream commit:
Backport author: Huacai Chen<chenhuacai@loongson.cn>
Commit author: Zi Yan<ziy@nvidia.com>

Status in newer kernel trees:
6.14.y | Present (exact SHA1)
6.12.y | Present (exact SHA1)

Note: The patch differs from the upstream commit:
---
1:  a259945efe6ad ! 1:  b80fbf97fca7b mm/migrate: correct nr_failed in migrate_pages_sync()
    @@ Metadata
      ## Commit message ##
         mm/migrate: correct nr_failed in migrate_pages_sync()
     
    +    commit a259945efe6ada94087ef666e9b38f8e34ea34ba upstream.
    +
         nr_failed was missing the large folio splits from migrate_pages_batch()
         and can cause a mismatch between migrate_pages() return value and the
         number of not migrated pages, i.e., when the return value of
    @@ Commit message
         Cc: David Hildenbrand <david@redhat.com>
         Cc: Matthew Wilcox <willy@infradead.org>
         Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
    +    Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
     
      ## mm/migrate.c ##
     @@ mm/migrate.c: struct migrate_pages_stats {
---

Results of testing on various branches:

| Branch                    | Patch Apply | Build Test |
|---------------------------|-------------|------------|
| stable/linux-6.6.y        |  Success    |  Success   |