There was a change at kdoc that ended breaking compatibility
with Python 3.7: str.removesuffix() was introduced on version
3.9.

Restore backward compatibility.

Reported-by: Akira Yokosawa <akiyks@gmail.com>
Closes: https://lore.kernel.org/linux-doc/57be9f77-9a94-4cde-aacb-184cae111506@gmail.com/
Fixes: 27ad33b6b349 ("kernel-doc: Fix symbol matching for dropped suffixes")
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
---
 scripts/lib/kdoc/kdoc_parser.py | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/scripts/lib/kdoc/kdoc_parser.py b/scripts/lib/kdoc/kdoc_parser.py
index 831f061f61b8..6273141033a8 100644
--- a/scripts/lib/kdoc/kdoc_parser.py
+++ b/scripts/lib/kdoc/kdoc_parser.py
@@ -1214,7 +1214,9 @@ class KernelDoc:
         # Found an export, trim out any special suffixes
         #
         for suffix in suffixes:
-            symbol = symbol.removesuffix(suffix)
+            # Be backward compatible with Python < 3.9
+            if symbol.endswith(suffix):
+                symbol = symbol[:-len(suffix)]
         function_set.add(symbol)
         return True
 
-- 
2.50.0