[PATCH RFC 4/6] mm: Move huge mapping declarations from internal.h to huge_mm.h

[Peter Xu]

Most of the huge mapping relevant helpers are declared in huge_mm.h, not
internal.h.  Move the only few from internal.h into huge_mm.h.

Here to move pmd_needs_soft_dirty_wp() over, we'll also need to move
vma_soft_dirty_enabled() into mm.h as it'll be needed in two headers
later (internal.h, huge_mm.h).

Signed-off-by: Peter Xu <peterx at redhat.com>
---
 include/linux/huge_mm.h | 10 ++++++++++
 include/linux/mm.h      | 18 ++++++++++++++++++
 mm/internal.h           | 33 ---------------------------------
 3 files changed, 28 insertions(+), 33 deletions(-)

diff --git a/include/linux/huge_mm.h b/include/linux/huge_mm.h
index 37482c8445d1..d8b642ad512d 100644
--- a/include/linux/huge_mm.h
+++ b/include/linux/huge_mm.h
@@ -8,6 +8,11 @@
 #include <linux/fs.h> /* only for vma_is_dax() */
 #include <linux/kobject.h>
 
+void touch_pud(struct vm_area_struct *vma, unsigned long addr,
+	       pud_t *pud, bool write);
+void touch_pmd(struct vm_area_struct *vma, unsigned long addr,
+	       pmd_t *pmd, bool write);
+pmd_t maybe_pmd_mkwrite(pmd_t pmd, struct vm_area_struct *vma);
 vm_fault_t do_huge_pmd_anonymous_page(struct vm_fault *vmf);
 int copy_huge_pmd(struct mm_struct *dst_mm, struct mm_struct *src_mm,
 		  pmd_t *dst_pmd, pmd_t *src_pmd, unsigned long addr,
@@ -629,4 +634,9 @@ static inline int split_folio_to_order(struct folio *folio, int new_order)
 #define split_folio_to_list(f, l) split_folio_to_list_to_order(f, l, 0)
 #define split_folio(f) split_folio_to_order(f, 0)
 
+static inline bool pmd_needs_soft_dirty_wp(struct vm_area_struct *vma, pmd_t pmd)
+{
+	return vma_soft_dirty_enabled(vma) && !pmd_soft_dirty(pmd);
+}
+
 #endif /* _LINUX_HUGE_MM_H */
diff --git a/include/linux/mm.h b/include/linux/mm.h
index 5f1075d19600..fa10802d8faa 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -1117,6 +1117,24 @@ static inline unsigned int folio_order(struct folio *folio)
 	return folio->_flags_1 & 0xff;
 }
 
+static inline bool vma_soft_dirty_enabled(struct vm_area_struct *vma)
+{
+	/*
+	 * NOTE: we must check this before VM_SOFTDIRTY on soft-dirty
+	 * enablements, because when without soft-dirty being compiled in,
+	 * VM_SOFTDIRTY is defined as 0x0, then !(vm_flags & VM_SOFTDIRTY)
+	 * will be constantly true.
+	 */
+	if (!IS_ENABLED(CONFIG_MEM_SOFT_DIRTY))
+		return false;
+
+	/*
+	 * Soft-dirty is kind of special: its tracking is enabled when the
+	 * vma flags not set.
+	 */
+	return !(vma->vm_flags & VM_SOFTDIRTY);
+}
+
 #include <linux/huge_mm.h>
 
 /*
diff --git a/mm/internal.h b/mm/internal.h
index b4d86436565b..e49941747749 100644
--- a/mm/internal.h
+++ b/mm/internal.h
@@ -917,8 +917,6 @@ bool need_mlock_drain(int cpu);
 void mlock_drain_local(void);
 void mlock_drain_remote(int cpu);
 
-extern pmd_t maybe_pmd_mkwrite(pmd_t pmd, struct vm_area_struct *vma);
-
 /**
  * vma_address - Find the virtual address a page range is mapped at
  * @vma: The vma which maps this object.
@@ -1229,14 +1227,6 @@ int migrate_device_coherent_page(struct page *page);
 int __must_check try_grab_folio(struct folio *folio, int refs,
 				unsigned int flags);
 
-/*
- * mm/huge_memory.c
- */
-void touch_pud(struct vm_area_struct *vma, unsigned long addr,
-	       pud_t *pud, bool write);
-void touch_pmd(struct vm_area_struct *vma, unsigned long addr,
-	       pmd_t *pmd, bool write);
-
 /*
  * mm/mmap.c
  */
@@ -1342,29 +1332,6 @@ static __always_inline void vma_set_range(struct vm_area_struct *vma,
 	vma->vm_pgoff = pgoff;
 }
 
-static inline bool vma_soft_dirty_enabled(struct vm_area_struct *vma)
-{
-	/*
-	 * NOTE: we must check this before VM_SOFTDIRTY on soft-dirty
-	 * enablements, because when without soft-dirty being compiled in,
-	 * VM_SOFTDIRTY is defined as 0x0, then !(vm_flags & VM_SOFTDIRTY)
-	 * will be constantly true.
-	 */
-	if (!IS_ENABLED(CONFIG_MEM_SOFT_DIRTY))
-		return false;
-
-	/*
-	 * Soft-dirty is kind of special: its tracking is enabled when the
-	 * vma flags not set.
-	 */
-	return !(vma->vm_flags & VM_SOFTDIRTY);
-}
-
-static inline bool pmd_needs_soft_dirty_wp(struct vm_area_struct *vma, pmd_t pmd)
-{
-	return vma_soft_dirty_enabled(vma) && !pmd_soft_dirty(pmd);
-}
-
 static inline bool pte_needs_soft_dirty_wp(struct vm_area_struct *vma, pte_t pte)
 {
 	return vma_soft_dirty_enabled(vma) && !pte_soft_dirty(pte);
-- 
2.45.0