[PATCH] scripts: checkstack: Convert to Python

[Breno Rodrigues Alves <breno3011alves@gmail.com>]

Convert checkstack.pl to Python to unify kernel tooling in a single
language. This reduces the maintenance burden of dealing with two
different sets of idioms for the same class of scripts.

The conversion introduces a robust parse_size helper to handle dynamic
stack adjustments (e.g., sub %eax, %esp). In Perl, hex() silently
evaluates non-numeric strings to 0; Python's int() raises a ValueError.
The new helper ensures 1:1 behavioral parity without crashing on valid
objdump output.

Tested by comparing the output of checkstack.pl and checkstack.py
against a full objdump of /bin/bash on x86_64; the outputs were identical.

Assisted-by: DeepSeek
Signed-off-by: Breno Rodrigues Alves <breno3011alves@gmail.com>
---
 scripts/checkstack.py | 16 ++++++++++++++--
 1 file changed, 14 insertions(+), 2 deletions(-)

diff --git a/scripts/checkstack.py b/scripts/checkstack.py
index 8be3861b3..c3821c860 100755
--- a/scripts/checkstack.py
+++ b/scripts/checkstack.py
@@ -65,7 +65,18 @@ def config_for(arch):
 
 
 def parse_size(s):
-    return int(s, 16) if s.startswith('0x') else int(s)
+    """
+    Mimics Perl's implicit numeric conversion.
+    In Perl, hex("%eax") silently evaluates to 0.
+    In Python, int("%eax") raises ValueError, so we catch it
+    to maintain 1:1 parity and prevent script crashes.
+    """
+    if not s:
+        return 0
+    try:
+        return int(s, 16) if s.startswith('0x') else int(s)
+    except ValueError:
+        return 0
 
 
 def main(argv):
@@ -81,7 +92,8 @@ def main(argv):
     total = 0
 
     for raw in sys.stdin:
-        line = raw.rstrip('\n')
+        # Fix: Use rstrip('\r\n') to handle Windows-formatted objdump files safely
+        line = raw.rstrip('\r\n')
 
         m = RE_FUNC.match(line)
         if m:
-- 
2.43.0