scripts: kdoc_parser.py: warn about Python version only once

[ Upstream commit ade9b95 ]

When running kernel-doc over multiple documents, it emits
one error message per file with is not what we want:

	$ python3.6 scripts/kernel-doc.py . --none
	...
	Warning: ./include/trace/events/swiotlb.h:0 Python 3.7 or later is required for correct results
	Warning: ./include/trace/events/iommu.h:0 Python 3.7 or later is required for correct results
	Warning: ./include/trace/events/sock.h:0 Python 3.7 or later is required for correct results
	...

Change the logic to warn it only once at the library:

	$ python3.6 scripts/kernel-doc.py . --none
	Warning: Python 3.7 or later is required for correct results
	Warning: ./include/cxl/features.h:0 Python 3.7 or later is required for correct results

When running from command line, it warns twice, but that sounds
ok.

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Message-ID: <68e54cf8b1201d1f683aad9bc710a99421910356.1758196090.git.mchehab+huawei@kernel.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
(cherry picked from commit ab665eb9997198408b915724df6954156260bfd3)
Signed-off-by: Wentao Guan <guanwentao@uniontech.com>

Author: mchehab

scripts/lib/kdoc/kdoc_parser.py

@@ -350,6 +350,7 @@ def dump_section(self, start_new=True):
             self.section = SECTION_DEFAULT
             self._contents = []
 
+python_warning = False
 
 class KernelDoc:
     """
@@ -383,9 +384,13 @@ def __init__(self, config, fname):
         # We need Python 3.7 for its "dicts remember the insertion
         # order" guarantee
         #
-        if sys.version_info.major == 3 and sys.version_info.minor < 7:
+        global python_warning
+        if (not python_warning and
+            sys.version_info.major == 3 and sys.version_info.minor < 7):
+
             self.emit_msg(0,
                           'Python 3.7 or later is required for correct results')
+            python_warning = True
 
     def emit_msg(self, ln, msg, warning=True):
         """Emit a message"""