linux-kernel - [PATCH 3/6] mm/hugetlb: fix missing call to restore_reserve_on

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Date:   Tue, 16 Aug 2022 21:05:50 +0800
From:   Miaohe Lin <linmiaohe@...wei.com>
To:     <akpm@...ux-foundation.org>, <mike.kravetz@...cle.com>,
        <songmuchun@...edance.com>
CC:     <linux-mm@...ck.org>, <linux-kernel@...r.kernel.org>,
        <linmiaohe@...wei.com>
Subject: [PATCH 3/6] mm/hugetlb: fix missing call to restore_reserve_on_error()

When huge_add_to_page_cache() fails, the page is freed directly without
calling restore_reserve_on_error() to restore reserve for newly allocated
pages not in page cache. Fix this by calling restore_reserve_on_error()
when huge_add_to_page_cache fails.

Signed-off-by: Miaohe Lin <linmiaohe@...wei.com>
---
 mm/hugetlb.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index ff991e5bdf1f..b69d7808f457 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -5603,6 +5603,7 @@ static vm_fault_t hugetlb_no_page(struct mm_struct *mm,
 		if (vma->vm_flags & VM_MAYSHARE) {
 			int err = huge_add_to_page_cache(page, mapping, idx);
 			if (err) {
+				restore_reserve_on_error(h, vma, haddr, page);
 				put_page(page);
 				if (err == -EEXIST)
 					goto retry;
-- 
2.23.0