[v9,07/96] mm: Constify page_count and page_ref_count
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Message ID 20210505150628.111735-8-willy@infradead.org
State New, archived
Headers show
  • Memory folios
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Commit Message

Matthew Wilcox May 5, 2021, 3:04 p.m. UTC
Now that compound_head() accepts a const struct page pointer, these two
functions can be marked as not modifying the page pointer they are passed.

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: William Kucharski <william.kucharski@oracle.com>
Reviewed-by: Vlastimil Babka <vbabka@suse.cz>
Reviewed-by: Anshuman Khandual <anshuman.khandual@arm.com>
 include/linux/page_ref.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

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diff --git a/include/linux/page_ref.h b/include/linux/page_ref.h
index f3318f34fc54..7ad46f45df39 100644
--- a/include/linux/page_ref.h
+++ b/include/linux/page_ref.h
@@ -62,12 +62,12 @@  static inline void __page_ref_unfreeze(struct page *page, int v)
-static inline int page_ref_count(struct page *page)
+static inline int page_ref_count(const struct page *page)
 	return atomic_read(&page->_refcount);
-static inline int page_count(struct page *page)
+static inline int page_count(const struct page *page)
 	return atomic_read(&compound_head(page)->_refcount);