lrdp: vmstat read by signed api

NR_ZONE_INACTIVE_FILE is expected to read as -28, instead
of a large positive number

Change-Id: Ie36d3e39d25c80ba9b81ad6b9c38c83c3f6fc763
Reported-by: Kassey Li <yingangl@qti.qualcomm.com>

linux-ramdump-parser-v2/parsers/vmstat.py

-# Copyright (c) 2013-2015, 2017 The Linux Foundation. All rights reserved.
+# Copyright (c) 2013-2015, 2017, 2019 The Linux Foundation. All rights reserved.
 #
 # This program is free software; you can redistribute it and/or modify
 # it under the terms of the GNU General Public License version 2 and
@@ -67,7 +67,12 @@ class ZoneInfo(RamParser):
         else:
             vmstats_addr = self.ramdump.address_of('vm_zone_stat')
         for i in xrange(0, max_zone_stats):
-            print_out_str('{0:30}: {1:8}'.format(vmstat_names[i], self.ramdump.read_word(
+            if self.ramdump.arm64:
+                print_out_str('{0:30}: {1:8}'.format(vmstat_names[i], self.ramdump.read_s64(
+                self.ramdump.array_index(vmstats_addr, 'atomic_long_t', i))))
+            else:
+                print_out_str('{0:30}: {1:8}'.format(vmstat_names[i], self.ramdump.read_s32(
                 self.ramdump.array_index(vmstats_addr, 'atomic_long_t', i))))
+
         print_out_str('Total system pages: {0}'.format(self.ramdump.read_word(
             self.ramdump.address_of('totalram_pages'))))