Re: [PATCH] mm/Kconfig: allow user to select MIGRATION if MEMORY_FAILURE is enabled

On Wed, 12 Aug 2026 13:45:30 +0300, Mike Rapoport wrote:
> Do we want to make users decide if they need MIGRATION when MEMORY_FAILURE
> is enabled?
>
> Just make MEMORY_FAILURE select MIGRATION.

I agree with this solution, but I discovered another way: just like
commit 6ebf98d71f9b509e833e ("mm: introduce CONFIG_NUMA_MIGRATION and
simplify CONFIG_MIGRATION") done, add CONFIG_MEMORY_FAILURE_MIGRATION
to select MIGRATION. The Modification is also very simple:
```patch
diff --git a/mm/memory-failure.c b/mm/memory-failure.c
index a8b03e2920ba..500e54ace6c9 100644
--- a/mm/memory-failure.c
+++ b/mm/memory-failure.c
@@ -1340,9 +1340,11 @@ static inline bool HWPoisonHandlable(struct page *page, unsigned long flags)
 	if (PageSlab(page))
 		return false;

+#ifdef CONFIG_MEMORY_FAILURE_MIGRATION
 	/* Soft offline could migrate movable_ops pages */
 	if ((flags & MF_SOFT_OFFLINE) && page_has_movable_ops(page))
 		return true;
+#endif

 	return PageLRU(page) || is_free_buddy_page(page);
 }
@@ -2028,7 +2030,8 @@ static int get_huge_page_for_hwpoison(unsigned long pfn, int flags,
 		count_increased = true;
 	} else if (folio_test_hugetlb_freed(folio)) {
 		ret = MF_HUGETLB_FREED;
-	} else if (folio_test_hugetlb_migratable(folio)) {
+	} else if (IS_ENABLED(CONFIG_MEMORY_FAILURE_MIGRATION) &&
+		   folio_test_hugetlb_migratable(folio)) {
 		if (folio_try_get(folio)) {
 			ret = MF_HUGETLB_IN_USED;
 			count_increased = true;
@@ -2051,10 +2054,12 @@ static int get_huge_page_for_hwpoison(unsigned long pfn, int flags,
 	 * Clearing hugetlb_migratable for hwpoisoned hugepages to prevent them
 	 * from being migrated by memory hotremove.
 	 */
+#ifdef CONFIG_MEMORY_FAILURE_MIGRATION
 	if (count_increased && folio_test_hugetlb_migratable(folio)) {
 		folio_clear_hugetlb_migratable(folio);
 		*migratable_cleared = true;
 	}
+#endif

 	spin_unlock_irq(&hugetlb_lock);
 	return ret;
@@ -2903,7 +2908,7 @@ static int soft_offline_in_use_page(struct page *page)
 		return 0;
 	}

-	isolated = isolate_folio_to_list(folio, &pagelist);
+	isolated = IS_ENABLED(CONFIG_MEMORY_FAILURE_MIGRATION) && isolate_folio_to_list(folio, &pagelist);

 	/*
 	 * If we succeed to isolate the folio, we grabbed another refcount on
```

Would this be a better way?