Add optional check for bad kernel-doc comments

Implement a '-none' output mode for kernel-doc which will only output
warning messages, and suppresses the warning message about there being
no kernel-doc in the file.

If the build has requested additional warnings, automatically check all
.c files.  This patch does not check .h files.  Enabling the warning
by default would add about 1300 warnings, so it's default off for now.
People who care can use this to check they didn't break the docs and
maybe we'll get all the warnings fixed and be able to enable this check
by default in the future.

Signed-off-by: Matthew Wilcox <mawilcox@microsoft.com>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>

diff --git a/scripts/Makefile.build b/scripts/Makefile.build
index 2e3a10e..aceac0b 100644 (file)
--- a/scripts/Makefile.build
+++ b/scripts/Makefile.build
@@ -108,6 +108,10 @@ ifneq ($(KBUILD_CHECKSRC),0)
   endif
 endif
 
+ifneq ($(KBUILD_ENABLE_EXTRA_GCC_CHECKS),)
+  cmd_checkdoc = $(srctree)/scripts/kernel-doc -none $< ;
+endif
+
 # Do section mismatch analysis for each module/built-in.o
 ifdef CONFIG_DEBUG_SECTION_MISMATCH
   cmd_secanalysis = ; scripts/mod/modpost $@
@@ -289,6 +293,7 @@ define rule_cc_o_c
        $(call echo-cmd,checksrc) $(cmd_checksrc)                         \
        $(call cmd_and_fixdep,cc_o_c)                                     \
        $(cmd_modversions_c)                                              \
+       $(cmd_checkdoc)                                                   \
        $(call echo-cmd,objtool) $(cmd_objtool)                           \
        $(call echo-cmd,record_mcount) $(cmd_record_mcount)
 endef

diff --git a/scripts/kernel-doc b/scripts/kernel-doc
index 67d051e..3bb43cb 100755 (executable)
--- a/scripts/kernel-doc
+++ b/scripts/kernel-doc
@@ -58,6 +58,7 @@ Output format selection (mutually exclusive):
   -man                 Output troff manual page format. This is the default.
   -rst                 Output reStructuredText format.
   -text                        Output plain text format.
+  -none                        Do not output documentation, only warnings.
 
 Output selection (mutually exclusive):
   -export              Only output documentation for symbols that have been
@@ -532,6 +533,8 @@ while ($ARGV[0] =~ m/^-(.*)/) {
        $output_mode = "gnome";
        @highlights = @highlights_gnome;
        $blankline = $blankline_gnome;
+    } elsif ($cmd eq "-none") {
+       $output_mode = "none";
     } elsif ($cmd eq "-module") { # not needed for XML, inherits from calling document
        $modulename = shift @ARGV;
     } elsif ($cmd eq "-function") { # to only output specific functions
@@ -2117,6 +2120,24 @@ sub output_blockhead_list(%) {
     }
 }
 
+
+## none mode output functions
+
+sub output_function_none(%) {
+}
+
+sub output_enum_none(%) {
+}
+
+sub output_typedef_none(%) {
+}
+
+sub output_struct_none(%) {
+}
+
+sub output_blockhead_none(%) {
+}
+
 ##
 # generic output function for all types (function, struct/union, typedef, enum);
 # calls the generated, variable output_ function name based on
@@ -3145,7 +3166,9 @@ sub process_file($) {
        }
     }
     if ($initial_section_counter == $section_counter) {
-       print STDERR "${file}:1: warning: no structured comments found\n";
+       if ($output_mode ne "none") {
+           print STDERR "${file}:1: warning: no structured comments found\n";
+       }
        if (($output_selection == OUTPUT_INCLUDE) && ($show_not_found == 1)) {
            print STDERR "    Was looking for '$_'.\n" for keys %function_table;
        }