[PATCH 1/2] mm: Constify folio_order()/folio_test_pmd_mappable()

[ran xiaokai]

From: Ran Xiaokai <ran.xiaokai@xxxxxxxxxx>

Constify folio_order()/folio_test_pmd_mappable().
No functional changes, just a preparation for the next patch.

Signed-off-by: Ran Xiaokai <ran.xiaokai@xxxxxxxxxx>
---
 include/linux/huge_mm.h | 2 +-
 include/linux/mm.h      | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/include/linux/huge_mm.h b/include/linux/huge_mm.h
index 2aa986a5cd1b..8d66e4eaa1bc 100644
--- a/include/linux/huge_mm.h
+++ b/include/linux/huge_mm.h
@@ -377,7 +377,7 @@ static inline spinlock_t *pud_trans_huge_lock(pud_t *pud,
  * folio_test_pmd_mappable - Can we map this folio with a PMD?
  * @folio: The folio to test
  */
-static inline bool folio_test_pmd_mappable(struct folio *folio)
+static inline bool folio_test_pmd_mappable(const struct folio *folio)
 {
 	return folio_order(folio) >= HPAGE_PMD_ORDER;
 }
diff --git a/include/linux/mm.h b/include/linux/mm.h
index 9a5652c5fadd..b1c11371a2a3 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -1105,7 +1105,7 @@ static inline unsigned int compound_order(struct page *page)
  *
  * Return: The order of the folio.
  */
-static inline unsigned int folio_order(struct folio *folio)
+static inline unsigned int folio_order(const struct folio *folio)
 {
 	if (!folio_test_large(folio))
 		return 0;
-- 
2.15.2