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[01/13] mm: Make some struct page's const.

Message ID 1311340653-19336-1-git-send-email-ian.campbell@citrix.com (mailing list archive)
State New, archived
Headers show

Commit Message

Ian Campbell July 22, 2011, 1:17 p.m. UTC
These uses are read-only and in a subsequent patch I have a const struct page
in my hand...

Signed-off-by: Ian Campbell <ian.campbell@citrix.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
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>
Cc: linux-mm@kvack.org
Cc: linux-kernel@vger.kernel.org
 include/linux/mm.h |   10 +++++-----
 mm/sparse.c        |    2 +-
 2 files changed, 6 insertions(+), 6 deletions(-)
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diff --git a/include/linux/mm.h b/include/linux/mm.h
index 9670f71..550ec8f 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -636,7 +636,7 @@  static inline pte_t maybe_mkwrite(pte_t pte, struct vm_area_struct *vma)
 #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;
@@ -664,15 +664,15 @@  static inline int zone_to_nid(struct zone *zone)
-extern int page_to_nid(struct page *page);
+extern int page_to_nid(const struct page *page);
-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;
-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)];
@@ -717,7 +717,7 @@  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)));
diff --git a/mm/sparse.c b/mm/sparse.c
index aa64b12..858e1df 100644
--- a/mm/sparse.c
+++ b/mm/sparse.c
@@ -40,7 +40,7 @@  static u8 section_to_node_table[NR_MEM_SECTIONS] __cacheline_aligned;
 static u16 section_to_node_table[NR_MEM_SECTIONS] __cacheline_aligned;
-int page_to_nid(struct page *page)
+int page_to_nid(const struct page *page)
 	return section_to_node_table[page_to_section(page)];