linux-kernel - [PATCH v2 1/6] mm/hugetlb: fix incorrect update of max_huge

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Date:   Tue, 23 Aug 2022 11:02:04 +0800
From:   Miaohe Lin <linmiaohe@...wei.com>
To:     <akpm@...ux-foundation.org>, <mike.kravetz@...cle.com>,
        <songmuchun@...edance.com>
CC:     <lukas.bulwahn@...il.com>, <linux-mm@...ck.org>,
        <linux-kernel@...r.kernel.org>, <linmiaohe@...wei.com>
Subject: [PATCH v2 1/6] mm/hugetlb: fix incorrect update of max_huge_pages

There should be pages_per_huge_page(h) / pages_per_huge_page(target_hstate)
pages incremented for target_hstate->max_huge_pages when page is demoted.
Update max_huge_pages accordingly for consistency.

Signed-off-by: Miaohe Lin <linmiaohe@...wei.com>
Reviewed-by: Muchun Song <songmuchun@...edance.com>
---
 mm/hugetlb.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index f8f1540108ab..19a7a83af569 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -3473,7 +3473,8 @@ static int demote_free_huge_page(struct hstate *h, struct page *page)
 	 * based on pool changes for the demoted page.
 	 */
 	h->max_huge_pages--;
-	target_hstate->max_huge_pages += pages_per_huge_page(h);
+	target_hstate->max_huge_pages +=
+		pages_per_huge_page(h) / pages_per_huge_page(target_hstate);
 
 	return rc;
 }
-- 
2.23.0