[PATCH 7/8] mm: move anon-exclusive batch helper to internal.h

[Dev Jain <dev.jain@arm.com>]

In preparation for optimizing large folio unmapping, we need to reuse
the page_anon_exclusive_batch helper in rmap.c. Therefore, move it from
mprotect.c to internal.h.

Signed-off-by: Dev Jain <dev.jain@arm.com>
---
 mm/internal.h | 17 +++++++++++++++++
 mm/mprotect.c | 17 -----------------
 2 files changed, 17 insertions(+), 17 deletions(-)

diff --git a/mm/internal.h b/mm/internal.h
index 3fc1c1c776ca3..df799d0c24e0b 100644
--- a/mm/internal.h
+++ b/mm/internal.h
@@ -474,6 +474,23 @@ static inline unsigned int folio_pte_batch_flags(struct folio *folio,
 unsigned int folio_pte_batch(struct folio *folio, pte_t *ptep, pte_t pte,
 		unsigned int max_nr);
 
+/*
+ * Get max length of consecutive PTEs pointing to PageAnonExclusive() pages or
+ * !PageAnonExclusive() pages, starting from start_idx. Caller must enforce
+ * that the PTEs point to consecutive pages of the same anon large folio.
+ */
+static __always_inline int page_anon_exclusive_batch(int start_idx, int max_len,
+		struct page *first_page, bool expected_anon_exclusive)
+{
+	int idx;
+
+	for (idx = start_idx + 1; idx < start_idx + max_len; ++idx) {
+		if (expected_anon_exclusive != PageAnonExclusive(first_page + idx))
+			break;
+	}
+	return idx - start_idx;
+}
+
 /**
  * pte_move_softleaf_offset - Move the softleaf entry offset field of a
  * softleaf pte forward or backward by delta
diff --git a/mm/mprotect.c b/mm/mprotect.c
index 2888ee638d872..75c2b1a00eb36 100644
--- a/mm/mprotect.c
+++ b/mm/mprotect.c
@@ -138,23 +138,6 @@ static __always_inline void prot_commit_flush_ptes(struct vm_area_struct *vma,
 		tlb_flush_pte_range(tlb, addr, nr_ptes * PAGE_SIZE);
 }
 
-/*
- * Get max length of consecutive ptes pointing to PageAnonExclusive() pages or
- * !PageAnonExclusive() pages, starting from start_idx. Caller must enforce
- * that the ptes point to consecutive pages of the same anon large folio.
- */
-static __always_inline int page_anon_exclusive_batch(int start_idx, int max_len,
-		struct page *first_page, bool expected_anon_exclusive)
-{
-	int idx;
-
-	for (idx = start_idx + 1; idx < start_idx + max_len; ++idx) {
-		if (expected_anon_exclusive != PageAnonExclusive(first_page + idx))
-			break;
-	}
-	return idx - start_idx;
-}
-
 /*
  * This function is a result of trying our very best to retain the
  * "avoid the write-fault handler" optimization. In can_change_pte_writable(),
-- 
2.43.0