[PATCH v1 01/17] mm: factor out large folio handling from folio_order() into folio_large_order()

[David Hildenbrand]

Let's factor it out into a simple helper function. This helper will
also come in handy when working with code where we know that our
folio is large.

Signed-off-by: David Hildenbrand <david@xxxxxxxxxx>
---
 include/linux/mm.h | 13 +++++++++----
 1 file changed, 9 insertions(+), 4 deletions(-)

diff --git a/include/linux/mm.h b/include/linux/mm.h
index b31d4bdd65ad5..3c6270f87bdc3 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -1071,6 +1071,11 @@ int vma_is_stack_for_current(struct vm_area_struct *vma);
 struct mmu_gather;
 struct inode;
 
+static inline unsigned int folio_large_order(const struct folio *folio)
+{
+	return folio->_flags_1 & 0xff;
+}
+
 /*
  * compound_order() can be called without holding a reference, which means
  * that niceties like page_folio() don't work.  These callers should be
@@ -1084,7 +1089,7 @@ static inline unsigned int compound_order(struct page *page)
 
 	if (!test_bit(PG_head, &folio->flags))
 		return 0;
-	return folio->_flags_1 & 0xff;
+	return folio_large_order(folio);
 }
 
 /**
@@ -1100,7 +1105,7 @@ static inline unsigned int folio_order(const struct folio *folio)
 {
 	if (!folio_test_large(folio))
 		return 0;
-	return folio->_flags_1 & 0xff;
+	return folio_large_order(folio);
 }
 
 #include <linux/huge_mm.h>
@@ -2035,7 +2040,7 @@ static inline long folio_nr_pages(const struct folio *folio)
 #ifdef CONFIG_64BIT
 	return folio->_folio_nr_pages;
 #else
-	return 1L << (folio->_flags_1 & 0xff);
+	return 1L << folio_large_order(folio);
 #endif
 }
 
@@ -2060,7 +2065,7 @@ static inline unsigned long compound_nr(struct page *page)
 #ifdef CONFIG_64BIT
 	return folio->_folio_nr_pages;
 #else
-	return 1L << (folio->_flags_1 & 0xff);
+	return 1L << folio_large_order(folio);
 #endif
 }
 
-- 
2.46.0