test/zdtm: Do not use hard coded PAGE_SIZE value

Since the page size may be different from an architecture/a system to
another it should not be hard coded to 4096.

As a consequence, several tests are failing on ppc64 due to a wrong page
size value.

This fix belongs to sysconf to get the current page size.
Signed-off-by: Laurent Dufour <ldufour@linux.vnet.ibm.com>
Reviewed-by: Christopher Covington <cov@codeaurora.org>
Acked-by: Andrew Vagin <avagin@odin.com>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

test/zdtm/lib/zdtmtst.h

@@ -2,9 +2,10 @@
 #define _VIMITESU_H_
 
 #include <sys/types.h>
+#include <unistd.h>
 
 #ifndef PAGE_SIZE
-# define PAGE_SIZE 4096
+# define PAGE_SIZE (unsigned int)(sysconf(_SC_PAGESIZE))
 #endif
 
 #ifndef PR_SET_CHILD_SUBREAPER

test/zdtm/live/transition/maps007.c

@@ -14,7 +14,6 @@
 
 #define MAP_SIZE (1UL << 20)
 #define MEM_SIZE (1UL << 29)
-#define PAGE_SIZE 4096
 
 const char *test_doc	= "create random mappings and touch memory";