When handling the freed hugetlb or in-use hugetlb, we should ignore the
failure of alloc_buddy_hugetlb_folio() to dissolve the old hugetlb successfully,
since we did not use the new allocated hugetlb in this 2 cases.
Signed-off-by: Baolin Wang <baolin.wang@xxxxxxxxxxxxxxxxx>
---
mm/hugetlb.c | 18 ++++++++++++------
1 file changed, 12 insertions(+), 6 deletions(-)
diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index 9d996fe4ecd9..212ab331d355 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -3042,9 +3042,8 @@ static int alloc_and_dissolve_hugetlb_folio(struct hstate *h,
* under the lock.
*/
new_folio = alloc_buddy_hugetlb_folio(h, gfp_mask, nid, NULL, NULL);
- if (!new_folio)
- return -ENOMEM;
- __prep_new_hugetlb_folio(h, new_folio);
+ if (new_folio)
+ __prep_new_hugetlb_folio(h, new_folio);
retry:
spin_lock_irq(&hugetlb_lock);
@@ -3075,6 +3074,11 @@ static int alloc_and_dissolve_hugetlb_folio(struct hstate *h,
cond_resched();
goto retry;
} else {
+ if (!new_folio) {
+ ret = -ENOMEM;
+ goto free_new;
+ }
+
/*
* Ok, old_folio is still a genuine free hugepage. Remove it from
* the freelist and decrease the counters. These will be
@@ -3102,9 +3106,11 @@ static int alloc_and_dissolve_hugetlb_folio(struct hstate *h,
free_new:
spin_unlock_irq(&hugetlb_lock);
- /* Folio has a zero ref count, but needs a ref to be freed */
- folio_ref_unfreeze(new_folio, 1);
- update_and_free_hugetlb_folio(h, new_folio, false);
+ if (new_folio) {
+ /* Folio has a zero ref count, but needs a ref to be freed */
+ folio_ref_unfreeze(new_folio, 1);
+ update_and_free_hugetlb_folio(h, new_folio, false);
+ }
return ret;
}
--
2.39.3
