1 files changed, 21 insertions, 10 deletions

diff --git a/mm/highmem.c b/mm/highmem.c
index bd48ba445dd4..b5c8e4c2d5d4 100644
--- a/mm/highmem.c
+++ b/mm/highmem.c
@@ -61,7 +61,7 @@ static inline int kmap_local_calc_idx(int idx)
 /*
  * Determine color of virtual address where the page should be mapped.
  */
-static inline unsigned int get_pkmap_color(struct page *page)
+static inline unsigned int get_pkmap_color(const struct page *page)
 {
 	return 0;
 }
@@ -111,13 +111,10 @@ static inline wait_queue_head_t *get_pkmap_wait_queue_head(unsigned int color)
 }
 #endif
 
-atomic_long_t _totalhigh_pages __read_mostly;
-EXPORT_SYMBOL(_totalhigh_pages);
-
-unsigned int __nr_free_highpages(void)
+unsigned long __nr_free_highpages(void)
 {
+	unsigned long pages = 0;
 	struct zone *zone;
-	unsigned int pages = 0;
 
 	for_each_populated_zone(zone) {
 		if (is_highmem(zone))
@@ -127,6 +124,20 @@ unsigned int __nr_free_highpages(void)
 	return pages;
 }
 
+unsigned long __totalhigh_pages(void)
+{
+	unsigned long pages = 0;
+	struct zone *zone;
+
+	for_each_populated_zone(zone) {
+		if (is_highmem(zone))
+			pages += zone_managed_pages(zone);
+	}
+
+	return pages;
+}
+EXPORT_SYMBOL(__totalhigh_pages);
+
 static int pkmap_count[LAST_PKMAP];
 static  __cacheline_aligned_in_smp DEFINE_SPINLOCK(kmap_lock);
 
@@ -323,7 +334,7 @@ EXPORT_SYMBOL(kmap_high);
  *
  * This can be called from any context.
  */
-void *kmap_high_get(struct page *page)
+void *kmap_high_get(const struct page *page)
 {
 	unsigned long vaddr, flags;
 
@@ -345,7 +356,7 @@ void *kmap_high_get(struct page *page)
  * If ARCH_NEEDS_KMAP_HIGH_GET is not defined then this may be called
  * only from user context.
  */
-void kunmap_high(struct page *page)
+void kunmap_high(const struct page *page)
 {
 	unsigned long vaddr;
 	unsigned long nr;
@@ -497,7 +508,7 @@ static inline void kmap_local_idx_pop(void)
 #endif
 
 #ifndef arch_kmap_local_high_get
-static inline void *arch_kmap_local_high_get(struct page *page)
+static inline void *arch_kmap_local_high_get(const struct page *page)
 {
 	return NULL;
 }
@@ -561,7 +572,7 @@ void *__kmap_local_pfn_prot(unsigned long pfn, pgprot_t prot)
 }
 EXPORT_SYMBOL_GPL(__kmap_local_pfn_prot);
 
-void *__kmap_local_page_prot(struct page *page, pgprot_t prot)
+void *__kmap_local_page_prot(const struct page *page, pgprot_t prot)
 {
 	void *kmap;