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Date: Wed, 5 May 2021 16:04:59 +0100
From: "Matthew Wilcox (Oracle)" <willy@...radead.org>
To: linux-fsdevel@...r.kernel.org, linux-mm@...ck.org
Cc: "Matthew Wilcox (Oracle)" <willy@...radead.org>,
linux-kernel@...r.kernel.org,
William Kucharski <william.kucharski@...cle.com>,
Vlastimil Babka <vbabka@...e.cz>,
Anshuman Khandual <anshuman.khandual@....com>
Subject: [PATCH v9 07/96] mm: Constify page_count and page_ref_count
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@...radead.org>
Reviewed-by: William Kucharski <william.kucharski@...cle.com>
Reviewed-by: Vlastimil Babka <vbabka@...e.cz>
Reviewed-by: Anshuman Khandual <anshuman.khandual@....com>
---
include/linux/page_ref.h | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
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)
#endif
-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);
}
--
2.30.2
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