[PATCH][for -mm] ia64: pgd_offset() constfication.

when compile 2.6.25-rc8-mm1, bellow warning happend.
because walk_page_range pass argument as "const struct mm*", 
but pgd_offset() receive as "struct mm*".

I fixed it.
(no functional change)

---------------------------------------------------------------
  CC      mm/pagewalk.o
mm/pagewalk.c: In function 'walk_page_range':
mm/pagewalk.c:111: warning: passing argument 1 of 'pgd_offset' discards qualifiers from pointer target type



Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>

---
 include/asm-ia64/pgtable.h |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Index: b/include/asm-ia64/pgtable.h
===================================================================
--- a/include/asm-ia64/pgtable.h        2008-04-04 12:24:18.000000000 +0900
+++ b/include/asm-ia64/pgtable.h        2008-04-09 12:42:49.000000000 +0900
@@ -374,7 +374,7 @@ pgd_index (unsigned long address)
 /* The offset in the 1-level directory is given by the 3 region bits
    (61..63) and the level-1 bits.  */
 static inline pgd_t*
-pgd_offset (struct mm_struct *mm, unsigned long address)
+pgd_offset (const struct mm_struct *mm, unsigned long address)
 {
        return mm->pgd + pgd_index(address);
 }


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