s390/mm: change HPAGE_SHIFT type to int

With making HPAGE_SHIFT an unsigned integer we also accidentally changed
pageblock_order.  In order to avoid compiler warnings we make
HPAGE_SHFIT an int again.

Signed-off-by: Dominik Dingel <dingel@linux.vnet.ibm.com>
Suggested-by: Andrew Morton <akpm@linux-foundation.org>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/arch/s390/mm/pgtable.c b/arch/s390/mm/pgtable.c
index 16154720..33082d0 100644
--- a/arch/s390/mm/pgtable.c
+++ b/arch/s390/mm/pgtable.c
@@ -31,7 +31,7 @@
 #define ALLOC_ORDER	2
 #define FRAG_MASK	0x03
 
-unsigned int HPAGE_SHIFT;
+int HPAGE_SHIFT;
 
 unsigned long *crst_table_alloc(struct mm_struct *mm)
 {