[merged mm-stable] mm-migrate-remove-pagetranshuge-check-in-numamigrate_isolate_page.patch removed from -mm tree

[merged mm-stable] mm-migrate-remove-pagetranshuge-check-in-numamigrate_isolate_page.patch removed from -mm tree

[Andrew Morton]

The quilt patch titled
     Subject: mm: migrate: remove PageTransHuge check in numamigrate_isolate_page()
has been removed from the -mm tree.  Its filename was
     mm-migrate-remove-pagetranshuge-check-in-numamigrate_isolate_page.patch

This patch was dropped because it was merged into the mm-stable branch
of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

------------------------------------------------------
From: Kefeng Wang <wangkefeng.wang@huawei.com>
Subject: mm: migrate: remove PageTransHuge check in numamigrate_isolate_page()
Date: Wed, 13 Sep 2023 17:51:24 +0800

Patch series "mm: migrate: more folio conversion and unification", v3.

Convert more migrate functions to use a folio, it is also a preparation
for large folio migration support when balancing numa.


This patch (of 8):

The assert VM_BUG_ON_PAGE(order && !PageTransHuge(page), page) is not very
useful,

   1) for a tail/base page, order = 0, for a head page, the order > 0 &&
      PageTransHuge() is true
   2) there is a PageCompound() check and only base page is handled in
      do_numa_page(), and do_huge_pmd_numa_page() only handle PMD-mapped
      THP
   3) even though the page is a tail page, isolate_lru_page() will post
      a warning, and fail to isolate the page
   4) if large folio/pte-mapped THP migration supported in the future,
      we could migrate the entire folio if numa fault on a tail page

so just remove the check.

Link: https://lkml.kernel.org/r/20230913095131.2426871-1-wangkefeng.wang@huawei.com
Link: https://lkml.kernel.org/r/20230913095131.2426871-2-wangkefeng.wang@huawei.com
Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com>
Suggested-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: David Hildenbrand <david@redhat.com>
Cc: Huang Ying <ying.huang@intel.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Mike Kravetz <mike.kravetz@oracle.com>
Cc: Zi Yan <ziy@nvidia.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 mm/migrate.c |    2 --
 1 file changed, 2 deletions(-)

--- a/mm/migrate.c~mm-migrate-remove-pagetranshuge-check-in-numamigrate_isolate_page
+++ a/mm/migrate.c
@@ -2486,8 +2486,6 @@ static int numamigrate_isolate_page(pg_d
 	int nr_pages = thp_nr_pages(page);
 	int order = compound_order(page);
 
-	VM_BUG_ON_PAGE(order && !PageTransHuge(page), page);
-
 	/* Do not migrate THP mapped by multiple processes */
 	if (PageTransHuge(page) && total_mapcount(page) > 1)
 		return 0;
_

Patches currently in -mm which might be from wangkefeng.wang@huawei.com are

mm-memory-add-vm_normal_folio_pmd.patch
mm-huge_memory-use-a-folio-in-do_huge_pmd_numa_page.patch
mm-memory-use-a-folio-in-do_numa_page.patch
mm-memory-make-numa_migrate_prep-to-take-a-folio.patch
mm-mempolicy-make-mpol_misplaced-to-take-a-folio.patch
sched-numa-mm-make-numa-migrate-functions-to-take-a-folio.patch