From 8f0ef3e08aaef134ec4acfe87a6628b3fda2243c Mon Sep 17 00:00:00 2001
From: Don Zickus <dzickus@redhat.com>
Date: Wed, 22 Jul 2015 13:58:53 -0400
Subject: [PATCH] ppc64le sync grub.cfg changes to disk (#1212114)

After installing a new kernel, if a panic is induced, not all the kernel
pieces are on the disk (most importantly the grub.cfg changes).  This can
lead to a hung system on a reboot because the older kernel can not be found.

Address this by forcing all the changes (mainly the fs meta data) to disk
before finishing the kernel package installation.

Tested by 'yum install kernel-...; echo c > /proc/sysrq-trigger'.

Before, the machine would panic and on reboot be stuck without a grub.cfg
to read.  After, works as expected.

Related: rhbz#1212114
---
 new-kernel-pkg | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/new-kernel-pkg b/new-kernel-pkg
index 1f6ab39..90652da 100755
--- a/new-kernel-pkg
+++ b/new-kernel-pkg
@@ -927,4 +927,12 @@ fi
 # if we mounted the U-Boot directory, unmount it.
 [ -n "$mounted" ] && umount $ubootDir
 
+# make sure changes make it to the disk.
+# if /boot is a mountpoint, force the meta data on disk
+# to by-pass writeback delay.
+# PPC64LE-only to deal with Petitboot issues
+if [ "$ARCH" = "ppc64le" ]; then
+    sync && mountpoint -q /boot &&fsfreeze -f /boot && fsfreeze -u /boot
+fi
+
 exit 0
-- 
1.8.3.1