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Message-ID: <20221021163703.3218176-15-jthoughton@google.com>
Date: Fri, 21 Oct 2022 16:36:30 +0000
From: James Houghton <jthoughton@...gle.com>
To: Mike Kravetz <mike.kravetz@...cle.com>,
Muchun Song <songmuchun@...edance.com>,
Peter Xu <peterx@...hat.com>
Cc: David Hildenbrand <david@...hat.com>,
David Rientjes <rientjes@...gle.com>,
Axel Rasmussen <axelrasmussen@...gle.com>,
Mina Almasry <almasrymina@...gle.com>,
"Zach O'Keefe" <zokeefe@...gle.com>,
Manish Mishra <manish.mishra@...anix.com>,
Naoya Horiguchi <naoya.horiguchi@....com>,
"Dr . David Alan Gilbert" <dgilbert@...hat.com>,
"Matthew Wilcox (Oracle)" <willy@...radead.org>,
Vlastimil Babka <vbabka@...e.cz>,
Baolin Wang <baolin.wang@...ux.alibaba.com>,
Miaohe Lin <linmiaohe@...wei.com>,
Yang Shi <shy828301@...il.com>,
Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
linux-kernel@...r.kernel.org,
James Houghton <jthoughton@...gle.com>
Subject: [RFC PATCH v2 14/47] hugetlb: make default arch_make_huge_pte
understand small mappings
This is a simple change: don't create a "huge" PTE if we are making a
regular, PAGE_SIZE PTE. All architectures that want to implement HGM
likely need to be changed in a similar way if they implement their own
version of arch_make_huge_pte.
Signed-off-by: James Houghton <jthoughton@...gle.com>
---
include/linux/hugetlb.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/include/linux/hugetlb.h b/include/linux/hugetlb.h
index 4b1548adecde..d305742e9d44 100644
--- a/include/linux/hugetlb.h
+++ b/include/linux/hugetlb.h
@@ -907,7 +907,7 @@ static inline void arch_clear_hugepage_flags(struct page *page) { }
static inline pte_t arch_make_huge_pte(pte_t entry, unsigned int shift,
vm_flags_t flags)
{
- return pte_mkhuge(entry);
+ return shift > PAGE_SHIFT ? pte_mkhuge(entry) : entry;
}
#endif
--
2.38.0.135.g90850a2211-goog
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