gh-151524: Make it clearer that `_PyInstrumentation_DISABLE` is immortal in the code (GH-151525)

https://github.com/python/cpython/commit/52bed26b79cc0333f1b26fd144488e4b38ebd0b5
commit: 52bed26b79cc0333f1b26fd144488e4b38ebd0b5
branch: main
author: stevens <[email protected]>
committer: ZeroIntensity <[email protected]>
date: 2026-08-07T11:34:10-04:00
summary:

gh-151524: Make it clearer that `_PyInstrumentation_DISABLE` is immortal in the code (GH-151525)

files:
M Python/instrumentation.c

diff --git a/Python/instrumentation.c b/Python/instrumentation.c
index 0af2070b5cd983..806d3fbf5d6b19 100644
--- a/Python/instrumentation.c
+++ b/Python/instrumentation.c
@@ -989,8 +989,12 @@ call_one_instrument(
     if (res == NULL) {
         return -1;
     }
+    if (res == &_PyInstrumentation_DISABLE) {
+        assert(_Py_IsImmortal(res));
+        return 1;
+    }
     Py_DECREF(res);
-    return (res == &_PyInstrumentation_DISABLE);
+    return 0;
 }
 
 static const int8_t MOST_SIGNIFICANT_BITS[16] = {

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