mm: change offset of zero_page_entry to ~0LL

Because 0 is actually a valid value.
Signed-off-by: Andrey Vagin <avagin@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

cr-restore.c

@@ -640,7 +640,7 @@ static int fixup_pages_data(int pid, int fd)
 		if (read_img(pgfd, &va) < 0)
 			goto out;
 
-		if (va == 0)
+		if (final_page_va(va))
 			break;
 
 		write(fd, &va, sizeof(va));
@@ -656,7 +656,7 @@ static int fixup_pages_data(int pid, int fd)
 		if (read_img(pgfd, &va) < 0)
 			goto out;
 
-		if (va == 0)
+		if (final_page_va(va))
 			break;
 
 		if (!should_restore_page(pid, va)) {

crtools.c

@@ -22,7 +22,7 @@
 #include "syscall.h"
 
 static struct cr_options opts;
-struct page_entry zero_page_entry;
+struct page_entry zero_page_entry = {.va = ~0LL};
 
 /*
  * The cr fd set is the set of files where the information
@@ -276,8 +276,6 @@ int main(int argc, char *argv[])
 
 	action = argv[1][0];
 
-	memzero_p(&zero_page_entry);
-
 	/* Default options */
 	opts.final_state = TASK_DEAD;
 

include/image.h

@@ -194,7 +194,7 @@ struct page_entry {
 	u8	data[PAGE_IMAGE_SIZE];
 } __packed;
 
-#define final_page_va(va)		((va) == 0)
+#define final_page_va(va)		((va) == ~0LL)
 #define final_page_entry(page_entry)	(final_page_va((page_entry)->va))
 
 struct sa_entry {