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Diffstat (limited to 'mm')
-rw-r--r--mm/migrate.c15
1 files changed, 2 insertions, 13 deletions
diff --git a/mm/migrate.c b/mm/migrate.c
index 8935cbe362ce..627671551873 100644
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -1916,7 +1916,6 @@ int migrate_misplaced_transhuge_page(struct mm_struct *mm,
int page_lru = page_is_file_cache(page);
unsigned long mmun_start = address & HPAGE_PMD_MASK;
unsigned long mmun_end = mmun_start + HPAGE_PMD_SIZE;
- pmd_t orig_entry;
/*
* Rate-limit the amount of data that is being migrated to a node.
@@ -1959,8 +1958,7 @@ int migrate_misplaced_transhuge_page(struct mm_struct *mm,
/* Recheck the target PMD */
mmu_notifier_invalidate_range_start(mm, mmun_start, mmun_end);
ptl = pmd_lock(mm, pmd);
- if (unlikely(!pmd_same(*pmd, entry) || page_count(page) != 2)) {
-fail_putback:
+ if (unlikely(!pmd_same(*pmd, entry) || !page_ref_freeze(page, 2))) {
spin_unlock(ptl);
mmu_notifier_invalidate_range_end(mm, mmun_start, mmun_end);
@@ -1982,7 +1980,6 @@ fail_putback:
goto out_unlock;
}
- orig_entry = *pmd;
entry = mk_huge_pmd(new_page, vma->vm_page_prot);
entry = maybe_pmd_mkwrite(pmd_mkdirty(entry), vma);
@@ -1999,15 +1996,7 @@ fail_putback:
set_pmd_at(mm, mmun_start, pmd, entry);
update_mmu_cache_pmd(vma, address, &entry);
- if (page_count(page) != 2) {
- set_pmd_at(mm, mmun_start, pmd, orig_entry);
- flush_pmd_tlb_range(vma, mmun_start, mmun_end);
- mmu_notifier_invalidate_range(mm, mmun_start, mmun_end);
- update_mmu_cache_pmd(vma, address, &entry);
- page_remove_rmap(new_page, true);
- goto fail_putback;
- }
-
+ page_ref_unfreeze(page, 2);
mlock_migrate_page(new_page, page);
page_remove_rmap(page, true);
set_page_owner_migrate_reason(new_page, MR_NUMA_MISPLACED);