linux-kernel - [RFC PATCH 22/39] mm: hugetlb: Expose vmemmap optimization functions

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Message-ID: <f1e643cd0201f5e2f98e59302e4a42cace3c058a.1726009989.git.ackerleytng@google.com>
Date: Tue, 10 Sep 2024 23:43:53 +0000
From: Ackerley Tng <ackerleytng@...gle.com>
To: tabba@...gle.com, quic_eberman@...cinc.com, roypat@...zon.co.uk, 
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Subject: [RFC PATCH 22/39] mm: hugetlb: Expose vmemmap optimization functions

These functions will need to be used by guest_memfd when
splitting/reconstructing HugeTLB pages.

Co-developed-by: Ackerley Tng <ackerleytng@...gle.com>
Signed-off-by: Ackerley Tng <ackerleytng@...gle.com>
Co-developed-by: Vishal Annapurve <vannapurve@...gle.com>
Signed-off-by: Vishal Annapurve <vannapurve@...gle.com>
---
 include/linux/hugetlb.h | 14 ++++++++++++++
 mm/hugetlb_vmemmap.h    | 11 -----------
 2 files changed, 14 insertions(+), 11 deletions(-)

diff --git a/include/linux/hugetlb.h b/include/linux/hugetlb.h
index 752062044b0b..7ba4ed9e0001 100644
--- a/include/linux/hugetlb.h
+++ b/include/linux/hugetlb.h
@@ -284,6 +284,20 @@ bool is_hugetlb_entry_migration(pte_t pte);
 bool is_hugetlb_entry_hwpoisoned(pte_t pte);
 void hugetlb_unshare_all_pmds(struct vm_area_struct *vma);
 
+#ifdef CONFIG_HUGETLB_PAGE_OPTIMIZE_VMEMMAP
+int hugetlb_vmemmap_restore_folio(const struct hstate *h, struct folio *folio);
+void hugetlb_vmemmap_optimize_folio(const struct hstate *h, struct folio *folio);
+#else
+static inline int hugetlb_vmemmap_restore_folio(const struct hstate *h, struct folio *folio)
+{
+	return 0;
+}
+
+static inline void hugetlb_vmemmap_optimize_folio(const struct hstate *h, struct folio *folio)
+{
+}
+#endif
+
 #else /* !CONFIG_HUGETLB_PAGE */
 
 static inline void hugetlb_dup_vma_private(struct vm_area_struct *vma)
diff --git a/mm/hugetlb_vmemmap.h b/mm/hugetlb_vmemmap.h
index 2fcae92d3359..e702ace3b42f 100644
--- a/mm/hugetlb_vmemmap.h
+++ b/mm/hugetlb_vmemmap.h
@@ -18,11 +18,9 @@
 #define HUGETLB_VMEMMAP_RESERVE_PAGES	(HUGETLB_VMEMMAP_RESERVE_SIZE / sizeof(struct page))
 
 #ifdef CONFIG_HUGETLB_PAGE_OPTIMIZE_VMEMMAP
-int hugetlb_vmemmap_restore_folio(const struct hstate *h, struct folio *folio);
 long hugetlb_vmemmap_restore_folios(const struct hstate *h,
 					struct list_head *folio_list,
 					struct list_head *non_hvo_folios);
-void hugetlb_vmemmap_optimize_folio(const struct hstate *h, struct folio *folio);
 void hugetlb_vmemmap_optimize_folios(struct hstate *h, struct list_head *folio_list);
 
 static inline unsigned int hugetlb_vmemmap_size(const struct hstate *h)
@@ -43,11 +41,6 @@ static inline unsigned int hugetlb_vmemmap_optimizable_size(const struct hstate
 	return size > 0 ? size : 0;
 }
 #else
-static inline int hugetlb_vmemmap_restore_folio(const struct hstate *h, struct folio *folio)
-{
-	return 0;
-}
-
 static long hugetlb_vmemmap_restore_folios(const struct hstate *h,
 					struct list_head *folio_list,
 					struct list_head *non_hvo_folios)
@@ -56,10 +49,6 @@ static long hugetlb_vmemmap_restore_folios(const struct hstate *h,
 	return 0;
 }
 
-static inline void hugetlb_vmemmap_optimize_folio(const struct hstate *h, struct folio *folio)
-{
-}
-
 static inline void hugetlb_vmemmap_optimize_folios(struct hstate *h, struct list_head *folio_list)
 {
 }
-- 
2.46.0.598.g6f2099f65c-goog