[PATCH] Use const* parameters in mm.h

[J.A. Magallon]

On Thu, 23 Mar 2006 22:07:11 +0100, "J.A. Magallon" <jamagallon@xxxxxxx> wrote:

> On Thu, 23 Mar 2006 01:40:46 -0800, Andrew Morton <akpm@xxxxxxxx> wrote:
> 
> > 
> > ftp://ftp.kernel.org/pub/linux/kernel/people/akpm/patches/2.6/2.6.16/2.6.16-mm1/
> > 
> 

As they are inline, this gives the compiler wide space for optmizations.

--- 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
@@ -464,7 +464,7 @@ 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;
 }
@@ -472,20 +472,20 @@ 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;
 }
@@ -519,7 +519,7 @@ static inline void set_page_links(struct
 extern struct page *mem_map;
 #endif
 
-static __always_inline void *lowmem_page_address(struct page *page)
+static __always_inline void *lowmem_page_address(const struct page *page)
 {
 	return __va(page_to_pfn(page) << PAGE_SHIFT);
 }
@@ -561,7 +561,7 @@ 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;
 
@@ -572,7 +572,7 @@ 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;
 }
@@ -581,7 +581,7 @@ 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);
@@ -598,7 +598,7 @@ 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;
 }
@@ -606,7 +606,7 @@ 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;
 }


--
J.A. Magallon <jamagallon()able!es>     \               Software is like sex:
werewolf!able!es                         \         It's better when it's free
Mandriva Linux release 2006.1 (Cooker) for i586
Linux 2.6.15-jam20 (gcc 4.0.3 (4.0.3-1mdk for Mandriva Linux release 2006.1))

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