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authorIan Campbell <ian.campbell@citrix.com>2011-07-25 17:11:51 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2011-07-25 20:57:07 -0700
commit33dd4e0ec91138c3d80e790c08a3db47426c81f2 (patch)
tree5b244874a004cc8a34033846f4e504c9306bf025 /include/linux/mm.h
parentee8f248d266ec6966c0ce6b7dec24de43dcc1b58 (diff)
mm: make some struct page's const
These uses are read-only and in a subsequent patch I have a const struct page in my hand... [akpm@linux-foundation.org: fix warnings in lowmem_page_address()] Signed-off-by: Ian Campbell <ian.campbell@citrix.com> Cc: Rik van Riel <riel@redhat.com> Cc: Andrea Arcangeli <aarcange@redhat.com> Cc: Mel Gorman <mel@csn.ul.ie> Cc: Michel Lespinasse <walken@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/linux/mm.h')
-rw-r--r--include/linux/mm.h12
1 files changed, 6 insertions, 6 deletions
diff --git a/include/linux/mm.h b/include/linux/mm.h
index 8a45ad22a170..6321e840e21d 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -637,7 +637,7 @@ static inline pte_t maybe_mkwrite(pte_t pte, struct vm_area_struct *vma)
#define SECTIONS_MASK ((1UL << SECTIONS_WIDTH) - 1)
#define ZONEID_MASK ((1UL << ZONEID_SHIFT) - 1)
-static inline enum zone_type page_zonenum(struct page *page)
+static inline enum zone_type page_zonenum(const struct page *page)
{
return (page->flags >> ZONES_PGSHIFT) & ZONES_MASK;
}
@@ -665,15 +665,15 @@ static inline int zone_to_nid(struct zone *zone)
}
#ifdef NODE_NOT_IN_PAGE_FLAGS
-extern int page_to_nid(struct page *page);
+extern int page_to_nid(const struct page *page);
#else
-static inline int page_to_nid(struct page *page)
+static inline int page_to_nid(const struct page *page)
{
return (page->flags >> NODES_PGSHIFT) & NODES_MASK;
}
#endif
-static inline struct zone *page_zone(struct page *page)
+static inline struct zone *page_zone(const struct page *page)
{
return &NODE_DATA(page_to_nid(page))->node_zones[page_zonenum(page)];
}
@@ -718,9 +718,9 @@ static inline void set_page_links(struct page *page, enum zone_type zone,
*/
#include <linux/vmstat.h>
-static __always_inline void *lowmem_page_address(struct page *page)
+static __always_inline void *lowmem_page_address(const struct page *page)
{
- return __va(PFN_PHYS(page_to_pfn(page)));
+ return __va(PFN_PHYS(page_to_pfn((struct page *)page)));
}
#if defined(CONFIG_HIGHMEM) && !defined(WANT_PAGE_VIRTUAL)