[PATCH 02/11] mm: Convert page_to_section() to memdesc_section()

["Matthew Wilcox (Oracle)" <willy@infradead.org>]

Pass in the memdesc_flags_t instead of a pointer to the page.  This will
allow us to remove a few conversions to struct page in upcoming patches.

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
---
 include/asm-generic/memory_model.h | 2 +-
 include/linux/mm.h                 | 4 ++--
 mm/sparse.c                        | 2 +-
 3 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/include/asm-generic/memory_model.h b/include/asm-generic/memory_model.h
index 74d0077cc5fa..efa6610acbc7 100644
--- a/include/asm-generic/memory_model.h
+++ b/include/asm-generic/memory_model.h
@@ -53,7 +53,7 @@ static inline int pfn_valid(unsigned long pfn)
  */
 #define __page_to_pfn(pg)					\
 ({	const struct page *__pg = (pg);				\
-	int __sec = page_to_section(__pg);			\
+	int __sec = memdesc_section(__pg->flags);		\
 	(unsigned long)(__pg - __section_mem_map_addr(__nr_to_section(__sec)));	\
 })
 
diff --git a/include/linux/mm.h b/include/linux/mm.h
index 779822a829a9..bfdec5ad3afb 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -1757,9 +1757,9 @@ static inline void set_page_section(struct page *page, unsigned long section)
 	page->flags.f |= (section & SECTIONS_MASK) << SECTIONS_PGSHIFT;
 }
 
-static inline unsigned long page_to_section(const struct page *page)
+static inline unsigned long memdesc_section(memdesc_flags_t mdf)
 {
-	return (page->flags.f >> SECTIONS_PGSHIFT) & SECTIONS_MASK;
+	return (mdf.f >> SECTIONS_PGSHIFT) & SECTIONS_MASK;
 }
 #endif
 
diff --git a/mm/sparse.c b/mm/sparse.c
index 3c012cf83cc2..6c1d400f8962 100644
--- a/mm/sparse.c
+++ b/mm/sparse.c
@@ -45,7 +45,7 @@ static u16 section_to_node_table[NR_MEM_SECTIONS] __cacheline_aligned;
 
 int page_to_nid(const struct page *page)
 {
-	return section_to_node_table[page_to_section(page)];
+	return section_to_node_table[memdesc_section(page->flags)];
 }
 EXPORT_SYMBOL(page_to_nid);
 
-- 
2.47.2