The quilt patch titled
Subject: mm/migration: return errno when isolate_huge_page failed
has been removed from the -mm tree. Its filename was
mm-migration-return-errno-when-isolate_huge_page-failed.patch
This patch was dropped because an updated version will be merged
------------------------------------------------------
From: Miaohe Lin <linmiaohe@xxxxxxxxxx>
Subject: mm/migration: return errno when isolate_huge_page failed
We might fail to isolate huge page due to e.g. the page is under
migration which cleared HPageMigratable. So we should return -EBUSY in
this case rather than always return 1 which could confuse the user. Also
we make the prototype of isolate_huge_page consistent with
isolate_lru_page to improve the readability.
Link: https://lkml.kernel.org/r/20220425132723.34824-4-linmiaohe@xxxxxxxxxx
Fixes: e8db67eb0ded ("mm: migrate: move_pages() supports thp migration")
Signed-off-by: Miaohe Lin <linmiaohe@xxxxxxxxxx>
Suggested-by: Huang Ying <ying.huang@xxxxxxxxx>
Cc: Christoph Hellwig <hch@xxxxxx>
Cc: Christoph Lameter <cl@xxxxxxxxx>
Cc: David Hildenbrand <david@xxxxxxxxxx>
Cc: David Howells <dhowells@xxxxxxxxxx>
Cc: Mike Kravetz <mike.kravetz@xxxxxxxxxx>
Cc: Muchun Song <songmuchun@xxxxxxxxxxxxx>
Cc: Naoya Horiguchi <naoya.horiguchi@xxxxxxx>
Cc: Mel Gorman <mgorman@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/linux/hugetlb.h | 6 +++---
mm/gup.c | 2 +-
mm/hugetlb.c | 11 +++++------
mm/memory-failure.c | 2 +-
mm/mempolicy.c | 2 +-
mm/migrate.c | 5 +++--
6 files changed, 14 insertions(+), 14 deletions(-)
--- a/include/linux/hugetlb.h~mm-migration-return-errno-when-isolate_huge_page-failed
+++ a/include/linux/hugetlb.h
@@ -170,7 +170,7 @@ bool hugetlb_reserve_pages(struct inode
vm_flags_t vm_flags);
long hugetlb_unreserve_pages(struct inode *inode, long start, long end,
long freed);
-bool isolate_huge_page(struct page *page, struct list_head *list);
+int isolate_huge_page(struct page *page, struct list_head *list);
int get_hwpoison_huge_page(struct page *page, bool *hugetlb);
int get_huge_page_for_hwpoison(unsigned long pfn, int flags);
void putback_active_hugepage(struct page *page);
@@ -376,9 +376,9 @@ static inline pte_t *huge_pte_offset(str
return NULL;
}
-static inline bool isolate_huge_page(struct page *page, struct list_head *list)
+static inline int isolate_huge_page(struct page *page, struct list_head *list)
{
- return false;
+ return -EBUSY;
}
static inline int get_hwpoison_huge_page(struct page *page, bool *hugetlb)
--- a/mm/gup.c~mm-migration-return-errno-when-isolate_huge_page-failed
+++ a/mm/gup.c
@@ -1869,7 +1869,7 @@ static long check_and_migrate_movable_pa
* Try to move out any movable page before pinning the range.
*/
if (folio_test_hugetlb(folio)) {
- if (!isolate_huge_page(&folio->page,
+ if (isolate_huge_page(&folio->page,
&movable_page_list))
isolation_error_count++;
continue;
--- a/mm/hugetlb.c~mm-migration-return-errno-when-isolate_huge_page-failed
+++ a/mm/hugetlb.c
@@ -2765,8 +2765,7 @@ retry:
* Fail with -EBUSY if not possible.
*/
spin_unlock_irq(&hugetlb_lock);
- if (!isolate_huge_page(old_page, list))
- ret = -EBUSY;
+ ret = isolate_huge_page(old_page, list);
spin_lock_irq(&hugetlb_lock);
goto free_new;
} else if (!HPageFreed(old_page)) {
@@ -2842,7 +2841,7 @@ int isolate_or_dissolve_huge_page(struct
if (hstate_is_gigantic(h))
return -ENOMEM;
- if (page_count(head) && isolate_huge_page(head, list))
+ if (page_count(head) && !isolate_huge_page(head, list))
ret = 0;
else if (!page_count(head))
ret = alloc_and_dissolve_huge_page(h, head, list);
@@ -6945,15 +6944,15 @@ follow_huge_pgd(struct mm_struct *mm, un
return pte_page(*(pte_t *)pgd) + ((address & ~PGDIR_MASK) >> PAGE_SHIFT);
}
-bool isolate_huge_page(struct page *page, struct list_head *list)
+int isolate_huge_page(struct page *page, struct list_head *list)
{
- bool ret = true;
+ int ret = 0;
spin_lock_irq(&hugetlb_lock);
if (!PageHeadHuge(page) ||
!HPageMigratable(page) ||
!get_page_unless_zero(page)) {
- ret = false;
+ ret = -EBUSY;
goto unlock;
}
ClearHPageMigratable(page);
--- a/mm/memory-failure.c~mm-migration-return-errno-when-isolate_huge_page-failed
+++ a/mm/memory-failure.c
@@ -2190,7 +2190,7 @@ static bool isolate_page(struct page *pa
bool lru = PageLRU(page);
if (PageHuge(page)) {
- isolated = isolate_huge_page(page, pagelist);
+ isolated = !isolate_huge_page(page, pagelist);
} else {
if (lru)
isolated = !isolate_lru_page(page);
--- a/mm/mempolicy.c~mm-migration-return-errno-when-isolate_huge_page-failed
+++ a/mm/mempolicy.c
@@ -602,7 +602,7 @@ static int queue_pages_hugetlb(pte_t *pt
/* With MPOL_MF_MOVE, we migrate only unshared hugepage. */
if (flags & (MPOL_MF_MOVE_ALL) ||
(flags & MPOL_MF_MOVE && page_mapcount(page) == 1)) {
- if (!isolate_huge_page(page, qp->pagelist) &&
+ if (isolate_huge_page(page, qp->pagelist) &&
(flags & MPOL_MF_STRICT))
/*
* Failed to isolate page but allow migrating pages
--- a/mm/migrate.c~mm-migration-return-errno-when-isolate_huge_page-failed
+++ a/mm/migrate.c
@@ -1628,8 +1628,9 @@ static int add_page_for_migration(struct
if (PageHuge(page)) {
if (PageHead(page)) {
- isolate_huge_page(page, pagelist);
- err = 1;
+ err = isolate_huge_page(page, pagelist);
+ if (!err)
+ err = 1;
}
} else {
struct page *head;
_
Patches currently in -mm which might be from linmiaohe@xxxxxxxxxx are
mm-swapfile-unuse_pte-can-map-random-data-if-swap-read-fails.patch
mm-swapfile-fix-lost-swap-bits-in-unuse_pte.patch
mm-migration-fix-potential-pte_unmap-on-an-not-mapped-pte.patch
mm-vmscan-take-min_slab_pages-into-account-when-try-to-call-shrink_node.patch
mm-vmscan-add-a-comment-about-madv_free-pages-check-in-folio_check_dirty_writeback.patch
mm-vmscan-introduce-helper-function-reclaim_page_list.patch
mm-vmscan-take-all-base-pages-of-thp-into-account-when-race-with-speculative-reference.patch
mm-vmscan-remove-obsolete-comment-in-kswapd_run.patch
mm-vmscan-use-helper-folio_is_file_lru.patch
mm-vmscan-use-helper-folio_is_file_lru-fix.patch
mm-z3fold-fix-sheduling-while-atomic.patch
mm-z3fold-fix-possible-null-pointer-dereferencing.patch
mm-z3fold-remove-buggy-use-of-stale-list-for-allocation.patch
mm-z3fold-throw-warning-on-failure-of-trylock_page-in-z3fold_alloc.patch
revert-mm-z3foldc-allow-__gfp_highmem-in-z3fold_alloc.patch
mm-z3fold-put-z3fold-page-back-into-unbuddied-list-when-reclaim-or-migration-fails.patch
mm-z3fold-always-clear-page_claimed-under-z3fold-page-lock.patch
mm-z3fold-fix-z3fold_reclaim_page-races-with-z3fold_free.patch
mm-z3fold-fix-z3fold_page_migrate-races-with-z3fold_map.patch
mm-swap-use-helper-is_swap_pte-in-swap_vma_readahead.patch
mm-swap-use-helper-macro-__attr_rw.patch
mm-swap-fold-__swap_info_get-into-its-sole-caller.patch
mm-swap-remove-unneeded-return-value-of-free_swap_slot.patch
mm-swap-print-bad-swap-offset-entry-in-get_swap_device.patch
mm-swap-remove-buggy-cache-nr-check-in-refill_swap_slots_cache.patch
mm-swap-remove-unneeded-p-=-null-check-in-__swap_duplicate.patch
mm-swap-make-page_swapcount-and-__lru_add_drain_all.patch
mm-swap-avoid-calling-swp_swap_info-when-try-to-check-swp_stable_writes.patch
mm-swap-add-helper-swap_offset_available.patch
mm-swap-fix-the-obsolete-comment-for-swp_type_shift.patch
mm-swap-clean-up-the-comment-of-find_next_to_unuse.patch
mm-swap-fix-the-comment-of-get_kernel_pages.patch
mm-swap-fix-comment-about-swap-extent.patch
