util/lint: Make usage of IS_ENABLED() an error

As long as we keep the IS_ENABLED() definition in libpayload for
compatibility, we should check that IS_ENABLED() usage doesn't
sneak back in.

Also remove all other IS_ENABLED() checks.

Change-Id: Id30ffa0089cec6c24fc3dbbb10a1be35f63b3d89
Signed-off-by: Nico Huber <nico.h@gmx.de>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/32229
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Julius Werner <jwerner@chromium.org>
Reviewed-by: Patrick Georgi <pgeorgi@google.com>

3 files changed, 16 insertions, 57 deletions

diff --git a/util/lint/checkpatch.pl b/util/lint/checkpatch.pl
index 265b04cef2..1affdb7b33 100755
--- a/util/lint/checkpatch.pl
+++ b/util/lint/checkpatch.pl
@@ -6184,16 +6184,6 @@ sub process {
 			}
 		}
 
-# check for #if defined CONFIG_<FOO> || defined CONFIG_<FOO>_MODULE
-		if ($line =~ /^\+\s*#\s*if\s+defined(?:\s*\(?\s*|\s+)(CONFIG_[A-Z_]+)\s*\)?\s*\|\|\s*defined(?:\s*\(?\s*|\s+)\1_MODULE\s*\)?\s*$/) {
-			my $config = $1;
-			if (WARN("PREFER_IS_ENABLED",
-				 "Prefer IS_ENABLED(<FOO>) to CONFIG_<FOO> || CONFIG_<FOO>_MODULE\n" . $herecurr) &&
-			    $fix) {
-				$fixed[$fixlinenr] = "\+#if IS_ENABLED($config)";
-			}
-		}
-
 # check for case / default statements not preceded by break/fallthrough/switch
 		if ($line =~ /^.\s*(?:case\s+(?:$Ident|$Constant)\s*|default):/) {
 			my $has_break = 0;
diff --git a/util/lint/kconfig_lint b/util/lint/kconfig_lint
index 502a61878b..47f04941f2 100755
--- a/util/lint/kconfig_lint
+++ b/util/lint/kconfig_lint
@@ -93,7 +93,7 @@ sub Main {
     check_used_symbols();
     check_for_ifdef();
     check_for_def();
-    check_is_enabled();
+    check_config_macro();
     check_selected_symbols();
 
     # Run checks based on the data that was found
@@ -213,27 +213,6 @@ sub check_for_ifdef {
             }
         }
     }
-
-    my @collected_is_enabled;
-    if ($dont_use_git_grep) {
-        @collected_is_enabled =
-            `grep -Irn -- "\\<IS_ENABLED[[:space:]]*(.*)" | grep -v '$exclude_dirs_and_files' | grep -v "kconfig.h"`;
-    }
-    else {
-        @collected_is_enabled =
-            `git grep -In -- "\\<IS_ENABLED[[:space:]]*(.*)" | grep -v '$exclude_dirs_and_files' | grep -v "kconfig.h"`;
-    }
-
-    while ( my $line = shift @collected_is_enabled ) {
-        if ($line !~ /CONFIG_/ && $line =~ /^([^:]+):(\d+):.+IS_ENABLED\s*\(\s*(\w+)/ ) {
-            my $file   = $1;
-            my $lineno = $2;
-            my $symbol = $3;
-            if ( ( exists $symbols{$symbol} ) ) {
-                show_error("IS_ENABLED missing CONFIG_ prefix on symbol '$symbol' at $file:$lineno.");
-            }
-        }
-    }
 }
 
 #-------------------------------------------------------------------------------
@@ -289,11 +268,15 @@ sub check_type {
 }
 
 #-------------------------------------------------------------------------------
-# check_is_enabled - The IS_ENABLED() and CONFIG() macros are only valid for
-# symbols of type bool. It would probably work on type hex or int if the value
-# was 0 or 1, but this seems like a bad plan.  Using it on strings is dead out.
+# check_config_macro - The CONFIG() macro is only valid for symbols of type
+# bool. It would probably work on type hex or int if the value was 0 or 1,
+# but this seems like a bad plan.  Using it on strings is dead out.
+#
+# The IS_ENABLED() macro is forbidden in coreboot now. Though, as long as
+# we keep its definition in libpayload for compatibility, we have to check
+# that it doesn't sneak back in.
 #-------------------------------------------------------------------------------
-sub check_is_enabled {
+sub check_config_macro {
     my @is_enabled_symbols = @collected_symbols;
 
     #sort through symbols found by grep and store them in a hash for easy access
@@ -322,31 +305,19 @@ sub check_is_enabled {
             my $lineno = $2;
             $line = $3;
             if ( ( $line !~ /(.*)IS_ENABLED\s*\(\s*CONFIG_(\w+)(.*)/ ) && ( $line !~ /(\/[\*\/])(.*)IS_ENABLED/ ) ) {
-                show_warning("# uninterpreted IS_ENABLED at $file:$lineno: $line");
+                show_error("# uninterpreted IS_ENABLED at $file:$lineno: $line");
                 next;
             }
             while ( $line =~ /(.*)IS_ENABLED\s*\(\s*CONFIG_(\w+)(.*)/ ) {
                 my $symbol = $2;
                 $line = $1 . $3;
-
-                #make sure that the type is bool
-                if ( exists $symbols{$symbol} ) {
-                    if ( $symbols{$symbol}{type} ne "bool" ) {
-                        show_error( "IS_ENABLED(CONFIG_$symbol) used at $file:$lineno."
-                              . "  IS_ENABLED is only valid for type 'bool', not '$symbols{$symbol}{type}'." );
-                    } else {
-                        show_warning("IS_ENABLED(CONFIG_$symbol) at $file:$lineno is deprecated. Use CONFIG($symbol) instead." );
-                    }
-                }
-                else {
-                    show_error("IS_ENABLED() used on unknown value CONFIG_$symbol at $file:$lineno.");
-                }
+                show_error("IS_ENABLED(CONFIG_$symbol) at $file:$lineno is deprecated. Use CONFIG($symbol) instead.");
             }
         } elsif ( $line =~ /^([^:]+):(\d+):\s*#\s*(?:el)?if\s+!?\s*\(?\s*CONFIG_(\w+)\)?(\s*==\s*1)?.*?$/ ) {
             my $file   = $1;
             my $lineno = $2;
             my $symbol = $3;
-            # If the type is bool, give a warning that IS_ENABLED should be used
+            # If the type is bool, give a warning that CONFIG() should be used
             if ( exists $symbols{$symbol} ) {
                 if ( $symbols{$symbol}{type} eq "bool" ) {
                     show_error( "#if CONFIG_$symbol used at $file:$lineno."
@@ -357,7 +328,7 @@ sub check_is_enabled {
             my $file   = $1;
             my $lineno = $2;
             my $symbol = $3;
-            # If the type is bool, give a warning that IS_ENABLED should be used
+            # If the type is bool, give a warning that CONFIG() should be used
             if ( exists $symbols{$symbol} ) {
                 if ( $symbols{$symbol}{type} eq "bool" ) {
                     show_error( "#if CONFIG_$symbol used at $file:$lineno."
diff --git a/util/lint/kconfig_lint_README b/util/lint/kconfig_lint_README
index 832f862422..fdf11e07e0 100644
--- a/util/lint/kconfig_lint_README
+++ b/util/lint/kconfig_lint_README
@@ -49,9 +49,7 @@ Warnings in Kconfig files:
   globs are excluded from this check.
 
 Warnings in coreboot source files:
-- 'IS_ENABLED()' block that could not be interpreted.
 - Kconfig files that are not loaded by a 'source' keyword.
-- IS_ENABLED() used on a Kconfig (deprecated in favor of CONFIG())
 - Naked use of boolean CONFIG_XXX Kconfig in C that's not wrapped in CONFIG()
 
 Errors in Kconfig files:
@@ -96,8 +94,8 @@ Errors in coreboot source files:
   symbols.
 - '#ifdef' or '#if defined' used on bool, int, or hex - these are always
   defined in coreboot's version of Kconfig.
-- The CONFIG() and IS_ENABLED() macros is only valid for bool symbols.
-- CONFIG() or IS_ENABLED() used on unknown Kconfig, like an obsolete symbol.
-- The IS_ENABLED() macro is used on a symbol without the CONFIG_ prefix.
+- The CONFIG() macro is only valid for bool symbols.
+- CONFIG() used on unknown Kconfig, like an obsolete symbol.
+- The deprecated IS_ENABLED() macro is used.
 
 TODO: check for choice entries at the top level