Commit 5f7dadf3 authored by Matthew Wilcox (Oracle)'s avatar Matthew Wilcox (Oracle) Committed by Linus Torvalds

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.

Link: https://lkml.kernel.org/r/20210416231531.2521383-7-willy@infradead.orgSigned-off-by: default avatarMatthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: default avatarVlastimil Babka <vbabka@suse.cz>
Reviewed-by: default avatarAnshuman Khandual <anshuman.khandual@arm.com>
Reviewed-by: default avatarWilliam Kucharski <william.kucharski@oracle.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent ca891f41
...@@ -62,12 +62,12 @@ static inline void __page_ref_unfreeze(struct page *page, int v) ...@@ -62,12 +62,12 @@ static inline void __page_ref_unfreeze(struct page *page, int v)
#endif #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); 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); return atomic_read(&compound_head(page)->_refcount);
} }
......
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