[PATCH 1/3 -mmotm-2009-12-10-17-19] Move functions related to zero page

[Minchan Kim <minchan.kim@gmail.com>]

This patch moves is_zero_pfn and my_zero_pfn to mm.h
for other use case.

This patch has no side effect and helps following patches.

Signed-off-by: Minchan Kim <minchan.kim@gmail.com>
---
 include/linux/mm.h |   15 +++++++++++++++
 mm/memory.c        |   14 --------------
 2 files changed, 15 insertions(+), 14 deletions(-)

diff --git a/include/linux/mm.h b/include/linux/mm.h
index be7f851..71bacd1 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -751,6 +751,21 @@ struct zap_details {
 	unsigned long truncate_count;		/* Compare vm_truncate_count */
 };
 
+#ifndef is_zero_pfn
+extern unsigned long zero_pfn;
+static inline int is_zero_pfn(unsigned long pfn)
+{
+	return pfn == zero_pfn;
+}
+#endif
+
+#ifndef my_zero_pfn
+static inline unsigned long my_zero_pfn(unsigned long addr)
+{
+	return zero_pfn;
+}
+#endif
+
 struct page *vm_normal_page(struct vm_area_struct *vma, unsigned long addr,
 		pte_t pte);
 
diff --git a/mm/memory.c b/mm/memory.c
index 09e4b1b..3743fb5 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -457,20 +457,6 @@ static inline int is_cow_mapping(unsigned int flags)
 	return (flags & (VM_SHARED | VM_MAYWRITE)) == VM_MAYWRITE;
 }
 
-#ifndef is_zero_pfn
-static inline int is_zero_pfn(unsigned long pfn)
-{
-	return pfn == zero_pfn;
-}
-#endif
-
-#ifndef my_zero_pfn
-static inline unsigned long my_zero_pfn(unsigned long addr)
-{
-	return zero_pfn;
-}
-#endif
-
 /*
  * vm_normal_page -- This function gets the "struct page" associated with a pte.
  *
-- 
1.5.6.5

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