localmodconfig: Comments and cleanup for streamline_config.pl

Added some more comments and cleaned up part of the the code to use
a named variable instead of one of the special $1 perl variables.

No functional changes.

Signed-off-by: Steven Rostedt <rostedt@goodmis.org>

1 files changed, 9 insertions, 4 deletions

diff --git a/scripts/kconfig/streamline_config.pl b/scripts/kconfig/streamline_config.pl
index bccf07ddd0b6..5c1ce8761205 100644
--- a/scripts/kconfig/streamline_config.pl
+++ b/scripts/kconfig/streamline_config.pl
@@ -186,6 +186,7 @@ sub read_kconfig {
             $state = "NEW";
             $config = $2;
 
+            # Add depends for 'if' nesting
             for (my $i = 0; $i < $iflevel; $i++) {
                 if ($i) {
                     $depends{$config} .= " " . $ifdeps[$i];
@@ -204,10 +205,11 @@ sub read_kconfig {
 
         # Get the configs that select this config
         } elsif ($state ne "NONE" && /^\s*select\s+(\S+)/) {
-            if (defined($selects{$1})) {
-                $selects{$1} .= " " . $config;
+            my $conf = $1;
+            if (defined($selects{$conf})) {
+                $selects{$conf} .= " " . $config;
             } else {
-                $selects{$1} = $config;
+                $selects{$conf} = $config;
             }
 
         # configs without prompts must be selected
@@ -250,6 +252,7 @@ if ($kconfig) {
     read_kconfig($kconfig);
 }
 
+# Makefiles can use variables to define their dependencies
 sub convert_vars {
     my ($line, %vars) = @_;
 
@@ -293,6 +296,7 @@ foreach my $makefile (@makefiles) {
 
         my $objs;
 
+        # Convert variables in a line (could define configs)
         $_ = convert_vars($_, %make_vars);
 
         # collect objects after obj-$(CONFIG_FOO_BAR)
@@ -373,7 +377,8 @@ while (<LIN>) {
 close (LIN);
 
 # add to the configs hash all configs that are needed to enable
-# a loaded module.
+# a loaded module. This is a direct obj-${CONFIG_FOO} += bar.o
+# where we know we need bar.o so we add FOO to the list.
 my %configs;
 foreach my $module (keys(%modules)) {
     if (defined($objects{$module})) {