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Subject[PATCH] mm/khugepaged: alloc_charge_hpage() take care of mem charge errors
Date
If memory charge failed, the caller shouldn't call mem_cgroup_uncharge().
Let alloc_charge_hpage() handle the error itself and clear hpage properly
if mem charge fails.

Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Yang Shi <shy828301@gmail.com>
Cc: David Stevens <stevensd@chromium.org>
Cc: stable@vger.kernel.org
Fixes: 9d82c69438d0 ("mm: memcontrol: convert anon and file-thp to new mem_cgroup_charge() API")
Signed-off-by: Peter Xu <peterx@redhat.com>
---
mm/khugepaged.c | 9 ++++++++-
1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/mm/khugepaged.c b/mm/khugepaged.c
index 8dbc39896811..941d1c7ea910 100644
--- a/mm/khugepaged.c
+++ b/mm/khugepaged.c
@@ -1063,12 +1063,19 @@ static int alloc_charge_hpage(struct page **hpage, struct mm_struct *mm,
gfp_t gfp = (cc->is_khugepaged ? alloc_hugepage_khugepaged_gfpmask() :
GFP_TRANSHUGE);
int node = hpage_collapse_find_target_node(cc);
+ struct folio *folio;

if (!hpage_collapse_alloc_page(hpage, gfp, node, &cc->alloc_nmask))
return SCAN_ALLOC_HUGE_PAGE_FAIL;
- if (unlikely(mem_cgroup_charge(page_folio(*hpage), mm, gfp)))
+
+ folio = page_folio(*hpage);
+ if (unlikely(mem_cgroup_charge(folio, mm, gfp))) {
+ folio_put(folio);
+ *hpage = NULL;
return SCAN_CGROUP_CHARGE_FAIL;
+ }
count_memcg_page_event(*hpage, THP_COLLAPSE_ALLOC);
+
return SCAN_SUCCEED;
}

--
2.39.1
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