[Crash-utility] [PATCH 2/2] memory.c: fix warning "failed to read pageflag_names entry" on Linux 4.6

[Andrey Skvortsov]

if kernel dump for Linux 4.6 is loaded there is warning message
"crash: failed to read pageflag_names entry".

Since Linux commit edf14cdbf9a0e5ab52698ca66d07a76ade0d5c46
[mm, printk: introduce new format string for flags] pageflag_names array
ends with empty element {0, NULL}.

Signed-off-by: Andrey Skvortsov <andrej.skvortzov at gmail.com>
---
 memory.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/memory.c b/memory.c
index d6271bc..5d685ea 100644
--- a/memory.c
+++ b/memory.c
@@ -6352,6 +6352,11 @@ page_flags_init_from_pageflag_names(void)
 			break;
 		}
 
+		if ((mask == 0UL) && !name) {   /* Linux 4.6 and later */
+			len--;
+			break;
+		}
+
 		if (!read_string((ulong)name, namebuf, BUFSIZE-1)) {
 			error(INFO, "failed to read pageflag_names entry (i: %d, name: \"%s\", mask:%d)\n",
 				i, name, mask);
-- 
2.8.1