Based on e6c474723dc66cd4765fd09453d6b48bd5905ba4 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Zbigniew=20J=C4=99drzejewski-Szmek?= <zbyszek@in.waw.pl>
Date: Sun, 20 Apr 2014 13:57:26 -0400
Subject: [PATCH] udev: warn when name_to_handle_at is not implemented

We have a bunch of reports from people who have a custom kernel and
are confused why udev is not running. Issue a warning on
error. Barring an error in the code, the only error that is possible
is ENOSYS.

https://bugzilla.redhat.com/show_bug.cgi?id=1072966
---
 src/libudev/libudev-monitor.c |    5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

--- src/libudev/libudev-monitor.c
+++ src/libudev/libudev-monitor.c	2014-05-12 00:00:00.000000000 +0000
@@ -115,8 +115,11 @@ static bool udev_has_devtmpfs(struct ude
         int r;
 
         r = name_to_handle_at(AT_FDCWD, "/dev", &h.handle, &mount_id, 0);
-        if (r < 0)
+        if (r < 0) {
+                if (errno != EOPNOTSUPP)
+                        udev_err(udev, "name_to_handle_at on /dev: %m\n");
                 return false;
+        }
 
 
         f = fopen("/proc/self/mountinfo", "re");