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

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: 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

include/linux/page_ext.h

+2 −2
Original line number Diff line number Diff line
@@ -50,7 +50,7 @@ static inline void page_ext_init(void) 
}

#endif



struct page_ext *lookup_page_ext(struct page *page);

struct page_ext *lookup_page_ext(const struct page *page);



#else /* !CONFIG_PAGE_EXTENSION */

struct page_ext;
@@ -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;

}

mm/page_ext.c

+2 −2
Original line number Diff line number Diff line
@@ -120,7 +120,7 @@ void __meminit pgdat_page_ext_init(struct pglist_data *pgdat) 
	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 index;
@@ -195,7 +195,7 @@ void __init page_ext_init_flatmem(void) 


#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);

	struct mem_section *section = __pfn_to_section(pfn);