[PATCH] Add code comments to help better understanding

[Lianbo Jiang]

Let's add some code comments to help better understanding, and
no code changes.

Signed-off-by: Lianbo Jiang <lijiang(a)redhat.com&gt;
---
 dracut-early-kdump.sh | 3 +++
 kdumpctl              | 4 ++++
 2 files changed, 7 insertions(+)

diff --git a/dracut-early-kdump.sh b/dracut-early-kdump.sh
index 23bb369a0c13..a4e14a46bf75 100755
--- a/dracut-early-kdump.sh
+++ b/dracut-early-kdump.sh
@@ -53,6 +53,9 @@ early_kdump_load()
         EARLY_KEXEC_ARGS="$EARLY_KEXEC_ARGS -s"
     fi
 
+    # Here, only output the messages, but do not save these messages
+    # to a file because the target disk may not be mounted yet, the
+    # earlykdump is too early.
     ddebug "earlykdump: $KEXEC ${EARLY_KEXEC_ARGS} $standard_kexec_args \
 	--command-line=$EARLY_KDUMP_CMDLINE --initrd=$EARLY_KDUMP_INITRD \
 	$EARLY_KDUMP_KERNEL"
diff --git a/kdumpctl b/kdumpctl
index e81671987c9b..94e4f5a1c020 100755
--- a/kdumpctl
+++ b/kdumpctl
@@ -719,6 +719,10 @@ load_kdump()
 
 	ddebug "$KEXEC $KEXEC_ARGS $standard_kexec_args --command-line=$KDUMP_COMMANDLINE
--initrd=$TARGET_INITRD $KDUMP_KERNEL"
 
+	# The '12' represents an intermediate temporary file descriptor
+	# to store the standard error file descriptor '2', and later
+	# restore the error file descriptor with the file descriptor '12'
+	# and release it.
 	exec 12>&2
 	exec 2>> $KDUMP_LOG_PATH/kdump.log
 	PS4='+ $(date "+%Y-%m-%d %H:%M:%S") ${BASH_SOURCE}@${LINENO}: '
-- 
2.17.1