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Message-Id: <20240725075830.63585-1-sunjunchao2870@gmail.com>
Date: Thu, 25 Jul 2024 03:58:30 -0400
From: Julian Sun <sunjunchao2870@...il.com>
To: linux-wireless@...r.kernel.org,
linux-kernel@...r.kernel.org,
linux-fsdevel@...r.kernel.org,
linux-kbuild@...r.kernel.org
Cc: jack@...e.cz,
brauner@...nel.org,
viro@...iv.linux.org.uk,
masahiroy@...nel.org,
akpm@...ux-foundation.org,
n.schier@....de,
ojeda@...nel.org,
djwong@...nel.org,
kvalo@...nel.org,
Julian Sun <sunjunchao2870@...il.com>
Subject: [PATCH] scripts: reduce false positives in the macro_checker script.
Reduce false positives in the macro_checker
in the following scenarios:
1. Conditional compilation
2. Macro definitions with only a single character
3. Macro definitions as (0) and (1)
Before this patch:
sjc@sjc:linux$ ./scripts/macro_checker.py fs | wc -l
99
After this patch:
sjc@sjc:linux$ ./scripts/macro_checker.py fs | wc -l
11
Most of the current warnings are valid now.
Signed-off-by: Julian Sun <sunjunchao2870@...il.com>
---
scripts/macro_checker.py | 37 ++++++++++++++++++++++++++++++++-----
1 file changed, 32 insertions(+), 5 deletions(-)
diff --git a/scripts/macro_checker.py b/scripts/macro_checker.py
index cd10c9c10d31..8195339ea5b5 100755
--- a/scripts/macro_checker.py
+++ b/scripts/macro_checker.py
@@ -9,9 +9,12 @@ import os
import re
macro_pattern = r"#define\s+(\w+)\(([^)]*)\)"
-# below two vars were used to reduce false positives
-do_while0_pattern = r"\s*do\s*\{\s*\}\s*while\s*\(\s*0\s*\)"
+# below vars were used to reduce false positives
+fp_patterns = [r"\s*do\s*\{\s*\}\s*while\s*\(\s*0\s*\)",
+ r"\(?0\)?", r"\(?1\)?"]
correct_macros = []
+cond_compile_mark = "#if"
+cond_compile_end = "#endif"
def check_macro(macro_line, report):
match = re.match(macro_pattern, macro_line)
@@ -21,15 +24,25 @@ def check_macro(macro_line, report):
content = match.group(2)
arguments = [item.strip() for item in content.split(',') if item.strip()]
- if (re.match(do_while0_pattern, macro_def)):
+ macro_def = macro_def.strip()
+ if not macro_def:
return
+ # used to reduce false positives, like #define endfor_nexthops(rt) }
+ if len(macro_def) == 1:
+ return
+
+ for fp_pattern in fp_patterns:
+ if (re.match(fp_pattern, macro_def)):
+ return
for arg in arguments:
# used to reduce false positives
if "..." in arg:
- continue
+ return
+ for arg in arguments:
if not arg in macro_def and report == False:
return
+ # if there is a correct macro with the same name, do not report it.
if not arg in macro_def and identifier not in correct_macros:
print(f"Argument {arg} is not used in function-line macro {identifier}")
return
@@ -49,6 +62,8 @@ def macro_strip(macro):
return macro
def file_check_macro(file_path, report):
+ # number of conditional compiling
+ cond_compile = 0
# only check .c and .h file
if not file_path.endswith(".c") and not file_path.endswith(".h"):
return
@@ -57,7 +72,14 @@ def file_check_macro(file_path, report):
while True:
line = f.readline()
if not line:
- return
+ break
+ line = line.strip()
+ if line.startswith(cond_compile_mark):
+ cond_compile += 1
+ continue
+ if line.startswith(cond_compile_end):
+ cond_compile -= 1
+ continue
macro = re.match(macro_pattern, line)
if macro:
@@ -67,6 +89,11 @@ def file_check_macro(file_path, report):
macro = macro.strip()
macro += f.readline()
macro = macro_strip(macro)
+ if file_path.endswith(".c") and cond_compile != 0:
+ continue
+ # 1 is for #ifdef xxx at the beginning of the header file
+ if file_path.endswith(".h") and cond_compile != 1:
+ continue
check_macro(macro, report)
def get_correct_macros(path):
--
2.39.2
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