Commit 10ed6341 authored by Kirill A. Shutemov's avatar Kirill A. Shutemov Committed by Linus Torvalds

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.comSigned-off-by: default avatarKirill A. Shutemov <kirill.shutemov@linux.intel.com>
Reviewed-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Cc: Vinayak Menon <vinmenon@codeaurora.org>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent b3a23696
...@@ -50,7 +50,7 @@ static inline void page_ext_init(void) ...@@ -50,7 +50,7 @@ static inline void page_ext_init(void)
} }
#endif #endif
struct page_ext *lookup_page_ext(struct page *page); struct page_ext *lookup_page_ext(const struct page *page);
#else /* !CONFIG_PAGE_EXTENSION */ #else /* !CONFIG_PAGE_EXTENSION */
struct page_ext; struct page_ext;
...@@ -59,7 +59,7 @@ static inline void pgdat_page_ext_init(struct pglist_data *pgdat) ...@@ -59,7 +59,7 @@ static inline void pgdat_page_ext_init(struct pglist_data *pgdat)
{ {
} }
static inline struct page_ext *lookup_page_ext(struct page *page) static inline struct page_ext *lookup_page_ext(const struct page *page)
{ {
return NULL; return NULL;
} }
......
...@@ -120,7 +120,7 @@ void __meminit pgdat_page_ext_init(struct pglist_data *pgdat) ...@@ -120,7 +120,7 @@ void __meminit pgdat_page_ext_init(struct pglist_data *pgdat)
pgdat->node_page_ext = NULL; pgdat->node_page_ext = NULL;
} }
struct page_ext *lookup_page_ext(struct page *page) struct page_ext *lookup_page_ext(const struct page *page)
{ {
unsigned long pfn = page_to_pfn(page); unsigned long pfn = page_to_pfn(page);
unsigned long index; unsigned long index;
...@@ -195,7 +195,7 @@ void __init page_ext_init_flatmem(void) ...@@ -195,7 +195,7 @@ void __init page_ext_init_flatmem(void)
#else /* CONFIG_FLAT_NODE_MEM_MAP */ #else /* CONFIG_FLAT_NODE_MEM_MAP */
struct page_ext *lookup_page_ext(struct page *page) struct page_ext *lookup_page_ext(const struct page *page)
{ {
unsigned long pfn = page_to_pfn(page); unsigned long pfn = page_to_pfn(page);
struct mem_section *section = __pfn_to_section(pfn); struct mem_section *section = __pfn_to_section(pfn);
......
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