linux-kernel - [PATCH 1/5] mm: move huge_zero_page declaration from huge

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Message-ID: <20250612105100.59144-2-p.raghav@samsung.com>
Date: Thu, 12 Jun 2025 12:50:56 +0200
From: Pankaj Raghav <p.raghav@...sung.com>
To: Suren Baghdasaryan <surenb@...gle.com>,
	Ryan Roberts <ryan.roberts@....com>,
	Mike Rapoport <rppt@...nel.org>,
	Michal Hocko <mhocko@...e.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Nico Pache <npache@...hat.com>,
	Dev Jain <dev.jain@....com>,
	Baolin Wang <baolin.wang@...ux.alibaba.com>,
	Borislav Petkov <bp@...en8.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H . Peter Anvin" <hpa@...or.com>,
	Vlastimil Babka <vbabka@...e.cz>,
	Zi Yan <ziy@...dia.com>,
	Dave Hansen <dave.hansen@...ux.intel.com>,
	David Hildenbrand <david@...hat.com>,
	Lorenzo Stoakes <lorenzo.stoakes@...cle.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"Liam R . Howlett" <Liam.Howlett@...cle.com>,
	Jens Axboe <axboe@...nel.dk>
Cc: linux-kernel@...r.kernel.org,
	linux-mm@...ck.org,
	willy@...radead.org,
	x86@...nel.org,
	linux-block@...r.kernel.org,
	linux-fsdevel@...r.kernel.org,
	"Darrick J . Wong" <djwong@...nel.org>,
	mcgrof@...nel.org,
	gost.dev@...sung.com,
	kernel@...kajraghav.com,
	hch@....de,
	Pankaj Raghav <p.raghav@...sung.com>
Subject: [PATCH 1/5] mm: move huge_zero_page declaration from huge_mm.h to mm.h

Move the declaration associated with huge_zero_page from huge_mm.h to
mm.h. This patch is in preparation for adding static PMD zero page.

No functional changes.

Signed-off-by: Pankaj Raghav <p.raghav@...sung.com>
---
 include/linux/huge_mm.h | 31 -------------------------------
 include/linux/mm.h      | 34 ++++++++++++++++++++++++++++++++++
 2 files changed, 34 insertions(+), 31 deletions(-)

diff --git a/include/linux/huge_mm.h b/include/linux/huge_mm.h
index 2f190c90192d..3e887374892c 100644
--- a/include/linux/huge_mm.h
+++ b/include/linux/huge_mm.h
@@ -478,22 +478,6 @@ struct page *follow_devmap_pmd(struct vm_area_struct *vma, unsigned long addr,
 
 vm_fault_t do_huge_pmd_numa_page(struct vm_fault *vmf);
 
-extern struct folio *huge_zero_folio;
-extern unsigned long huge_zero_pfn;
-
-static inline bool is_huge_zero_folio(const struct folio *folio)
-{
-	return READ_ONCE(huge_zero_folio) == folio;
-}
-
-static inline bool is_huge_zero_pmd(pmd_t pmd)
-{
-	return pmd_present(pmd) && READ_ONCE(huge_zero_pfn) == pmd_pfn(pmd);
-}
-
-struct folio *mm_get_huge_zero_folio(struct mm_struct *mm);
-void mm_put_huge_zero_folio(struct mm_struct *mm);
-
 static inline bool thp_migration_supported(void)
 {
 	return IS_ENABLED(CONFIG_ARCH_ENABLE_THP_MIGRATION);
@@ -631,21 +615,6 @@ static inline vm_fault_t do_huge_pmd_numa_page(struct vm_fault *vmf)
 	return 0;
 }
 
-static inline bool is_huge_zero_folio(const struct folio *folio)
-{
-	return false;
-}
-
-static inline bool is_huge_zero_pmd(pmd_t pmd)
-{
-	return false;
-}
-
-static inline void mm_put_huge_zero_folio(struct mm_struct *mm)
-{
-	return;
-}
-
 static inline struct page *follow_devmap_pmd(struct vm_area_struct *vma,
 	unsigned long addr, pmd_t *pmd, int flags, struct dev_pagemap **pgmap)
 {
diff --git a/include/linux/mm.h b/include/linux/mm.h
index 0ef2ba0c667a..c8fbeaacf896 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -4018,6 +4018,40 @@ static inline bool vma_is_special_huge(const struct vm_area_struct *vma)
 
 #endif /* CONFIG_TRANSPARENT_HUGEPAGE || CONFIG_HUGETLBFS */
 
+#ifdef CONFIG_TRANSPARENT_HUGEPAGE
+extern struct folio *huge_zero_folio;
+extern unsigned long huge_zero_pfn;
+
+static inline bool is_huge_zero_folio(const struct folio *folio)
+{
+	return READ_ONCE(huge_zero_folio) == folio;
+}
+
+static inline bool is_huge_zero_pmd(pmd_t pmd)
+{
+	return pmd_present(pmd) && READ_ONCE(huge_zero_pfn) == pmd_pfn(pmd);
+}
+
+struct folio *mm_get_huge_zero_folio(struct mm_struct *mm);
+void mm_put_huge_zero_folio(struct mm_struct *mm);
+
+#else
+static inline bool is_huge_zero_folio(const struct folio *folio)
+{
+	return false;
+}
+
+static inline bool is_huge_zero_pmd(pmd_t pmd)
+{
+	return false;
+}
+
+static inline void mm_put_huge_zero_folio(struct mm_struct *mm)
+{
+	return;
+}
+#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
+
 #if MAX_NUMNODES > 1
 void __init setup_nr_node_ids(void);
 #else
-- 
2.49.0