uml: remove page_size()

userspace code used to have to call the kernelspace function page_size() in
order to determine the value of the kernel's PAGE_SIZE.  Since this is now
available directly from kern_constants.h as UM_KERN_PAGE_SIZE, page_size() can
be deleted and calls changed to use the constant.

Signed-off-by: Jeff Dike <jdike@linux.intel.com>
Cc: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/arch/um/drivers/net_user.c b/arch/um/drivers/net_user.c
index b63a860..3503cff 100644
--- a/arch/um/drivers/net_user.c
+++ b/arch/um/drivers/net_user.c
@@ -18,6 +18,7 @@
 #include "net_user.h"
 #include "os.h"
 #include "um_malloc.h"
+#include "kern_constants.h"
 
 int tap_open_common(void *dev, char *gate_addr)
 {
@@ -215,7 +216,7 @@
 	sprintf(netmask_buf, "%d.%d.%d.%d", netmask[0], netmask[1], 
 		netmask[2], netmask[3]);
 
-	output_len = page_size();
+	output_len = UM_KERN_PAGE_SIZE;
 	output = um_kmalloc(output_len);
 	if(output == NULL)
 		printk("change : failed to allocate output buffer\n");