mm/page_ext.c: constify lookup_page_ext() argument
lookup_page_ext() finds 'struct page_ext' for a given page. It requires only read access to the given struct page. Current implemnentation takes 'struct page *' as an argument. It makes compiler complain when 'const struct page *' passed. Change the argument to 'const struct page *'. Link: http://lkml.kernel.org/r/20180531135457.20167-3-kirill.shutemov@linux.intel.com Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Reviewed-by: Andrew Morton <akpm@linux-foundation.org> Cc: Vinayak Menon <vinmenon@codeaurora.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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@ -50,7 +50,7 @@ static inline void page_ext_init(void)
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}
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#endif
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struct page_ext *lookup_page_ext(struct page *page);
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struct page_ext *lookup_page_ext(const struct page *page);
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#else /* !CONFIG_PAGE_EXTENSION */
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struct page_ext;
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@ -59,7 +59,7 @@ static inline void pgdat_page_ext_init(struct pglist_data *pgdat)
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{
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}
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static inline struct page_ext *lookup_page_ext(struct page *page)
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static inline struct page_ext *lookup_page_ext(const struct page *page)
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{
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return NULL;
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}
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@ -120,7 +120,7 @@ void __meminit pgdat_page_ext_init(struct pglist_data *pgdat)
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pgdat->node_page_ext = NULL;
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}
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struct page_ext *lookup_page_ext(struct page *page)
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struct page_ext *lookup_page_ext(const struct page *page)
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{
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unsigned long pfn = page_to_pfn(page);
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unsigned long index;
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@ -195,7 +195,7 @@ fail:
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#else /* CONFIG_FLAT_NODE_MEM_MAP */
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struct page_ext *lookup_page_ext(struct page *page)
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struct page_ext *lookup_page_ext(const struct page *page)
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{
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unsigned long pfn = page_to_pfn(page);
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struct mem_section *section = __pfn_to_section(pfn);
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