1 files changed, 4 insertions, 4 deletions

diff --git a/scripts/bootgraph.pl b/scripts/bootgraph.pl
index 4e5f4ab2ed7f..2243353fe55d 100644
--- a/scripts/bootgraph.pl
+++ b/scripts/bootgraph.pl
@@ -46,7 +46,7 @@ my $firsttime = 100;
 my $count = 0;
 while (<>) {
         my $line = $_;
-        if ($line =~ /([0-9\.]+)\] calling  ([a-zA-Z\_]+)\+/) {
+        if ($line =~ /([0-9\.]+)\] calling  ([a-zA-Z0-9\_]+)\+/) {
                 my $func = $2;
                 if ($done == 0) {
                         $start{$func} = $1;
@@ -66,7 +66,7 @@ while (<>) {
                 $count = $count + 1;
         }
 
-        if ($line =~ /([0-9\.]+)\] initcall ([a-zA-Z\_]+)\+.*returned/) {
+        if ($line =~ /([0-9\.]+)\] initcall ([a-zA-Z0-9\_]+)\+.*returned/) {
                 if ($done == 0) {
                         $end{$2} = $1;
                         $maxtime = $1;
@@ -81,8 +81,8 @@ while (<>) {
 }
 
 if ($count == 0) {
-        print "No data found in the dmesg. Make sure CONFIG_PRINTK_TIME is enabled and\n";
-        print "that initcall_debug is passed on the kernel command line.\n\n";
+        print "No data found in the dmesg. Make sure that 'printk.time=1' and\n";
+        print "'initcall_debug' are passed on the kernel command line.\n\n";
         print "Usage: \n";
         print "      dmesg | perl scripts/bootgraph.pl > output.svg\n\n";
         exit;