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    Subject[RFC3 01/14] Add some consts for inlines in mm.h
    [PATCH] const attributes for some inlines in mm.h

    Const attributes allow the compiler to generate more efficient code by
    allowing callers to keep arguments of struct page in registers.

    Signed-off-by: Christoph Lameter <clameter@sgi.com>

    Index: linux-2.6.15-rc5-mm2/include/linux/mm.h
    ===================================================================
    --- linux-2.6.15-rc5-mm2.orig/include/linux/mm.h 2005-12-12 09:10:34.000000000 -0800
    +++ linux-2.6.15-rc5-mm2/include/linux/mm.h 2005-12-14 14:39:50.000000000 -0800
    @@ -456,7 +456,7 @@ void put_page(struct page *page);
    #define SECTIONS_MASK ((1UL << SECTIONS_WIDTH) - 1)
    #define ZONETABLE_MASK ((1UL << ZONETABLE_SHIFT) - 1)

    -static inline unsigned long page_zonenum(struct page *page)
    +static inline unsigned long page_zonenum(const struct page *page)
    {
    return (page->flags >> ZONES_PGSHIFT) & ZONES_MASK;
    }
    @@ -464,20 +464,20 @@ static inline unsigned long page_zonenum
    struct zone;
    extern struct zone *zone_table[];

    -static inline struct zone *page_zone(struct page *page)
    +static inline struct zone *page_zone(const struct page *page)
    {
    return zone_table[(page->flags >> ZONETABLE_PGSHIFT) &
    ZONETABLE_MASK];
    }

    -static inline unsigned long page_to_nid(struct page *page)
    +static inline unsigned long page_to_nid(const struct page *page)
    {
    if (FLAGS_HAS_NODE)
    return (page->flags >> NODES_PGSHIFT) & NODES_MASK;
    else
    return page_zone(page)->zone_pgdat->node_id;
    }
    -static inline unsigned long page_to_section(struct page *page)
    +static inline unsigned long page_to_section(const struct page *page)
    {
    return (page->flags >> SECTIONS_PGSHIFT) & SECTIONS_MASK;
    }
    @@ -511,7 +511,7 @@ static inline void set_page_links(struct
    extern struct page *mem_map;
    #endif

    -static inline void *lowmem_page_address(struct page *page)
    +static inline void *lowmem_page_address(const struct page *page)
    {
    return __va(page_to_pfn(page) << PAGE_SHIFT);
    }
    @@ -553,7 +553,7 @@ void page_address_init(void);
    #define PAGE_MAPPING_ANON 1

    extern struct address_space swapper_space;
    -static inline struct address_space *page_mapping(struct page *page)
    +static inline struct address_space *page_mapping(const struct page *page)
    {
    struct address_space *mapping = page->mapping;

    @@ -564,7 +564,7 @@ static inline struct address_space *page
    return mapping;
    }

    -static inline int PageAnon(struct page *page)
    +static inline int PageAnon(const struct page *page)
    {
    return ((unsigned long)page->mapping & PAGE_MAPPING_ANON) != 0;
    }
    @@ -573,7 +573,7 @@ static inline int PageAnon(struct page *
    * Return the pagecache index of the passed page. Regular pagecache pages
    * use ->index whereas swapcache pages use ->private
    */
    -static inline pgoff_t page_index(struct page *page)
    +static inline pgoff_t page_index(const struct page *page)
    {
    if (unlikely(PageSwapCache(page)))
    return page_private(page);
    @@ -590,7 +590,7 @@ static inline void reset_page_mapcount(s
    atomic_set(&(page)->_mapcount, -1);
    }

    -static inline int page_mapcount(struct page *page)
    +static inline int page_mapcount(const struct page *page)
    {
    return atomic_read(&(page)->_mapcount) + 1;
    }
    @@ -598,7 +598,7 @@ static inline int page_mapcount(struct p
    /*
    * Return true if this page is mapped into pagetables.
    */
    -static inline int page_mapped(struct page *page)
    +static inline int page_mapped(const struct page *page)
    {
    return atomic_read(&(page)->_mapcount) >= 0;
    }
    -
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