scripts/kernel-doc.py: Properly handle Werror and exit codes

The original kernel-doc script has a logic to return warnings
as errors, and to report the number of warnings found, if in
verbose mode.

Implement it to be fully compatible with the original script.

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Link: https://lore.kernel.org/r/de33b0cebd9fdf82d8b221bcfe41db7269286222.1744106242.git.mchehab+huawei@kernel.org

scripts/kernel-doc.py

@@ -78,8 +78,6 @@
 #    Yacine Belkadi <yacine.belkadi.1@gmail.com>
 #    Yujie Liu <yujie.liu@intel.com>
 
-# TODO: implement warning filtering
-
 """
 kernel_doc
 ==========
@@ -295,6 +293,22 @@ def main():
         if msg:
             print(msg)
 
+    error_count = kfiles.errors
+    if not error_count:
+        sys.exit(0)
+
+    if args.werror:
+        print(f"{error_count} warnings as errors")
+        sys.exit(error_count)
+
+    if args.verbose:
+        print(f"{error_count} errors")
+
+    if args.none:
+        sys.exit(0)
+
+    sys.exit(error_count)
+
 
 # Call main method
 if __name__ == "__main__":

scripts/lib/kdoc/kdoc_files.py

@@ -12,7 +12,6 @@ import argparse
 import logging
 import os
 import re
-import sys
 
 from kdoc_parser import KernelDoc
 from kdoc_output import OutputFormat
@@ -109,7 +108,7 @@ class KernelFiles():
                     KernelDoc.process_export(self.config.function_table, line)
 
         except IOError:
-            print(f"Error: Cannot open fname {fname}", fname=sys.stderr)
+            self.config.log.error("Error: Cannot open fname %s", fname)
             self.config.errors += 1
 
     def file_not_found_cb(self, fname):
@@ -262,3 +261,12 @@ class KernelFiles():
                                             fname, ln, dtype)
             if msg:
                 yield fname, msg
+
+    @property
+    def errors(self):
+        """
+        Return a count of the number of warnings found, including
+        the ones displayed while interacting over self.msg.
+        """
+
+        return self.config.errors

scripts/lib/kdoc/kdoc_output.py

@@ -128,11 +128,9 @@ class OutputFormat:
 
         warnings = args.get('warnings', [])
 
-        for warning, log_msg in warnings:
-            if warning:
-                self.config.log.warning(log_msg)
-            else:
-                self.config.log.info(log_msg)
+        for log_msg in warnings:
+            self.config.log.warning(log_msg)
+            self.config.errors += 1
 
     def check_doc(self, name, args):
         """Check if DOC should be output"""

scripts/lib/kdoc/kdoc_parser.py

@@ -137,17 +137,18 @@ class KernelDoc:
 
         log_msg = f"{self.fname}:{ln} {msg}"
 
+        if not warning:
+            self.config.log.info(log_msg)
+            return
+
         if self.entry:
             # Delegate warning output to output logic, as this way it
             # will report warnings/info only for symbols that are output
 
-            self.entry.warnings.append((warning, log_msg))
+            self.entry.warnings.append(log_msg)
             return
 
-        if warning:
-            self.config.log.warning(log_msg)
-        else:
-            self.config.log.info(log_msg)
+        self.config.log.warning(log_msg)
 
     def dump_section(self, start_new=True):
         """
@@ -556,7 +557,6 @@ class KernelDoc:
 
         if not members:
             self.emit_warning(ln, f"{proto} error: Cannot parse struct or union!")
-            self.config.errors += 1
             return
 
         if self.entry.identifier != declaration_name:
@@ -831,7 +831,6 @@ class KernelDoc:
 
         if not members:
             self.emit_warning(ln, f"{proto}: error: Cannot parse enum!")
-            self.config.errors += 1
             return
 
         if self.entry.identifier != declaration_name:
@@ -1132,7 +1131,6 @@ class KernelDoc:
             return
 
         self.emit_warning(ln, "error: Cannot parse typedef!")
-        self.config.errors += 1
 
     @staticmethod
     def process_export(function_table, line):
@@ -1677,4 +1675,3 @@ class KernelDoc:
                         self.process_docblock(ln, line)
         except OSError:
             self.config.log.error(f"Error: Cannot open file {self.fname}")
-            self.config.errors += 1