add blacklist option

For the "blacklist" here, it means prevent the kernel modules
from loading into kdump initrd, which is different from RHEL6.

Signed-off-by: Dave Young <dyoung@redhat.com>
Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com>
Acked-by: Vivek Goyal <vgoyal@redhat.com>

kdump.conf

@@ -20,6 +20,10 @@
 #			  <user@server>:/var/crash/%HOST-%DATE/, supports DNS
 #			  NOTE: make sure user has necessary write
 #			  permissions on server
+# blacklist <list of kernel modules>	- Specify a space-separated list of
+# 			  kernel modules not to add to the initramfs.
+#			  The kernel modules have to be specified without the
+#			  ".ko" suffix.
 #
 # sshkey <path>		- Will use the sshkey to do ssh dump
 #			  Specifies the path of the ssh key you want to use
@@ -107,6 +111,7 @@
 #net my.server.com:/export/tmp
 #net user@my.server.com
 #sshkey /root/.ssh/kdump_id_rsa
+#blacklist cfg80211
 path /var/crash
 #core_collector makedumpfile -c --message-level 1 -d 31
 #core_collector scp

kdump.conf.5

@@ -42,6 +42,12 @@ supports DNS. NOTE: make sure user has necessary write permissions on
 server and that a fqdn is used as the server name
 .RE
 
+.B blacklist <list of kernel modules>
+.RS
+Specify a space-separated list of kernel modules not to add to the initramfs.
+The kernel modules have to be specified without the ".ko" suffix.
+.RE
+
 .B sshkey <path>
 .RS
 Specifies the path of the ssh key you want to use when do ssh dump,

mkdumprd

@@ -50,6 +50,9 @@ check_size() {
         raw)
             avail=$(get_raw_size "$2")
             ;;
+        blacklist)
+            add_dracut_arg "--omit-drivers" "$config_val"
+            ;;
         *)
             return
     esac