linux-kernel - [PATCH 6/7] mm/hugetlb add folio

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Date:   Mon, 29 Aug 2022 16:00:13 -0700
From:   Sidhartha Kumar <sidhartha.kumar@...cle.com>
To:     linux-kernel@...r.kernel.org, linux-mm@...ck.org
Cc:     akpm@...ux-foundation.org, songmuchun@...edance.com,
        mike.kravetz@...cle.com, willy@...radead.org, vbabka@...e.cz,
        william.kucharski@...cle.com, dhowells@...hat.com,
        peterx@...hat.com, arnd@...db.de, ccross@...gle.com,
        hughd@...gle.com, ebiederm@...ssion.com,
        Sidhartha Kumar <sidhartha.kumar@...cle.com>
Subject: [PATCH 6/7] mm/hugetlb add folio_hstate()

Helper function to retrieve hstate information from a hugetlb folio.


Signed-off-by: Sidhartha Kumar <sidhartha.kumar@...cle.com>
---
 include/linux/hugetlb.h | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/include/linux/hugetlb.h b/include/linux/hugetlb.h
index d8742c5bf454..093b5d32d6b5 100644
--- a/include/linux/hugetlb.h
+++ b/include/linux/hugetlb.h
@@ -815,10 +815,15 @@ static inline pte_t arch_make_huge_pte(pte_t entry, unsigned int shift,
 }
 #endif
 
+static inline struct hstate *folio_hstate(struct folio *folio)
+{
+	VM_BUG_ON_FOLIO(!folio_test_hugetlb(folio), folio);
+	return size_to_hstate(folio_size(folio));
+}
+
 static inline struct hstate *page_hstate(struct page *page)
 {
-	VM_BUG_ON_PAGE(!PageHuge(page), page);
-	return size_to_hstate(page_size(page));
+	return folio_hstate(page_folio(page));
 }
 
 static inline unsigned hstate_index_to_shift(unsigned index)
-- 
2.31.1