linux-kernel - [RFC PATCH 07/15] mm: hugetlb: use PAGES_PER_SECTION to check mem

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Message-Id: <20210805190253.2795604-8-zi.yan@sent.com>
Date:   Thu,  5 Aug 2021 15:02:45 -0400
From:   Zi Yan <zi.yan@...t.com>
To:     David Hildenbrand <david@...hat.com>, linux-mm@...ck.org
Cc:     Matthew Wilcox <willy@...radead.org>,
        Vlastimil Babka <vbabka@...e.cz>,
        "Kirill A . Shutemov" <kirill.shutemov@...ux.intel.com>,
        Mike Kravetz <mike.kravetz@...cle.com>,
        Michal Hocko <mhocko@...nel.org>,
        John Hubbard <jhubbard@...dia.com>,
        linux-kernel@...r.kernel.org, Zi Yan <ziy@...dia.com>
Subject: [RFC PATCH 07/15] mm: hugetlb: use PAGES_PER_SECTION to check mem_map discontiguity

From: Zi Yan <ziy@...dia.com>

mem_map is only guaranteed to be virtually contiguous within a section.
Use PAGES_PER_SECTION to check the condition properly.

Signed-off-by: Zi Yan <ziy@...dia.com>
Cc: Mike Kravetz <mike.kravetz@...cle.com>
Cc: linux-mm@...ck.org
Cc: linux-kernel@...r.kernel.org
---
 mm/hugetlb.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index ce79d76c42ce..7f78203d6feb 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -1784,7 +1784,7 @@ pgoff_t hugetlb_basepage_index(struct page *page)
 	pgoff_t index = page_index(page_head);
 	unsigned long compound_idx;
 
-	if (compound_order(page_head) >= MAX_ORDER)
+	if (compound_order(page_head) >= PAGES_PER_SECTION)
 		compound_idx = page_to_pfn(page) - page_to_pfn(page_head);
 	else
 		compound_idx = page - page_head;
-- 
2.30.2