util/lint/kconfig_lint: change warning levels and text

- Add an exception for MAINBOARD_POWER_ON_AFTER_POWER_FAIL when checking
- With those exceptions set, we don't have anymore #define or #ifdef
warnings, so turn them to errors so no more can be pushed.
- Change the definition of an unused symbol from a warning to a note.
There are times when unused symbols are expected.
- Upgrade the warning for loading Kconfig files multiple times from
a warning to an error.

Change-Id: I6dcb06d4f0b099d5ccaf7643e72dd790719bdf58
Signed-off-by: Martin Roth <martinroth@google.com>
Reviewed-on: https://review.coreboot.org/16840
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>

1 files changed, 13 insertions, 5 deletions

diff --git a/util/lint/kconfig_lint b/util/lint/kconfig_lint
index 064f3db33f..39a02910ca 100755
--- a/util/lint/kconfig_lint
+++ b/util/lint/kconfig_lint
@@ -197,8 +197,11 @@ sub check_for_ifdef {
             my $symbol = $3;
 
             if ( ( exists $symbols{$symbol} ) && ( $symbols{$symbol}{type} ne "string" ) ) {
-                show_warning( "#ifdef 'CONFIG_$symbol' used at $file:$lineno."
+                # TODO: Remove special check for CONFIG_MAINBOARD_POWER_ON_AFTER_POWER_FAIL
+                if ($symbol ne "MAINBOARD_POWER_ON_AFTER_POWER_FAIL") {
+                    show_error( "#ifdef 'CONFIG_$symbol' used at $file:$lineno."
                       . "  Symbols of type '$symbols{$symbol}{type}' are always defined." );
+                }
             }
         }
     }
@@ -261,7 +264,10 @@ sub check_for_def {
             my $symbol = $3;
 
             if ( ( exists $symbols{$symbol} ) ) {
-                show_warning("#define of symbol 'CONFIG_$symbol' used at $file:$lineno.");
+                # TODO: Remove special check for CONFIG_MAINBOARD_POWER_ON_AFTER_POWER_FAIL
+                if ($symbol ne "MAINBOARD_POWER_ON_AFTER_POWER_FAIL") {
+                    show_error("#define of symbol 'CONFIG_$symbol' used at $file:$lineno.");
+                }
             }
             else {
                 show_warning( "#define 'CONFIG_$symbol' used at $file:$lineno."
@@ -460,7 +466,9 @@ sub check_used_symbols {
         for ( my $i = 0 ; $i <= $symbols{$key}{count} ; $i++ ) {
             my $filename = $symbols{$key}{$i}{file};
             my $line_no  = $symbols{$key}{$i}{line_no};
-            show_warning("Unused symbol '$key' referenced at $filename:$line_no.");
+            if ($show_note_output) {
+                print("#!!!!! Note: Unused symbol '$key' defined at $filename:$line_no.");
+            }
         }
     }
 }
@@ -1162,9 +1170,9 @@ sub load_kconfig_file {
     #if the file exists, try to load it.
     elsif ( -e "$input_file" ) {
 
-        #throw a warning if the file has already been loaded.
+        #throw an error if the file has already been loaded.
         if ( exists $loaded_files{$input_file} ) {
-            show_warning("'$input_file' sourced at $loadfile:$loadline was already loaded by $loaded_files{$input_file}");
+            show_error("'$input_file' sourced at $loadfile:$loadline was already loaded by $loaded_files{$input_file}");
         }
 
         #load the file's contents and mark the file as loaded for checking later