linux-kernel - [RFC PATCH v2 06/30] mm: change thp_order and thp

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Message-Id: <20200928175428.4110504-7-zi.yan@sent.com>
Date:   Mon, 28 Sep 2020 13:54:04 -0400
From:   Zi Yan <zi.yan@...t.com>
To:     linux-mm@...ck.org
Cc:     "Kirill A . Shutemov" <kirill.shutemov@...ux.intel.com>,
        Roman Gushchin <guro@...com>, Rik van Riel <riel@...riel.com>,
        Matthew Wilcox <willy@...radead.org>,
        Shakeel Butt <shakeelb@...gle.com>,
        Yang Shi <shy828301@...il.com>,
        Jason Gunthorpe <jgg@...dia.com>,
        Mike Kravetz <mike.kravetz@...cle.com>,
        Michal Hocko <mhocko@...e.com>,
        David Hildenbrand <david@...hat.com>,
        William Kucharski <william.kucharski@...cle.com>,
        Andrea Arcangeli <aarcange@...hat.com>,
        John Hubbard <jhubbard@...dia.com>,
        David Nellans <dnellans@...dia.com>,
        linux-kernel@...r.kernel.org, Zi Yan <ziy@...dia.com>
Subject: [RFC PATCH v2 06/30] mm: change thp_order and thp_nr as we will have not just PMD THPs.

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

As PUD THP is going to be added in the following patches, thp_order and
thp_nr can be HPAGE_PUD_ORDER and HPAGE_PUD_NR, respectively.

Signed-off-by: Zi Yan <ziy@...dia.com>
---
 include/linux/huge_mm.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/include/linux/huge_mm.h b/include/linux/huge_mm.h
index e9d228d4fc69..addd206150e2 100644
--- a/include/linux/huge_mm.h
+++ b/include/linux/huge_mm.h
@@ -279,7 +279,7 @@ static inline unsigned int thp_order(struct page *page)
 {
 	VM_BUG_ON_PGFLAGS(PageTail(page), page);
 	if (PageHead(page))
-		return HPAGE_PMD_ORDER;
+		return page[1].compound_order;
 	return 0;
 }
 
@@ -291,7 +291,7 @@ static inline int thp_nr_pages(struct page *page)
 {
 	VM_BUG_ON_PGFLAGS(PageTail(page), page);
 	if (PageHead(page))
-		return HPAGE_PMD_NR;
+		return (1<<page[1].compound_order);
 	return 1;
 }
 
-- 
2.28.0