[PATCH v3 8/9] perf python: Initialize debug output on module load

[Ian Rogers <irogers@google.com>]

Unlike the perf binary's main(), PyInit_perf() does not call
perf_debug_setup(). As a result, the first warning or error printed from
the perf Python C extension hits debug_file() with _debug_file == NULL
and emits 'debug_file not set' without a trailing newline before the
actual diagnostic message.

Call perf_debug_setup() in PyInit_perf() and add the missing trailing
newline to the fallback warning in debug_file().

Fixes: ec49230cf6dd ("perf debug: Expose debug file")
Assisted-by: Antigravity:gemini-3.1-pro
Signed-off-by: Ian Rogers <irogers@google.com>
---
 tools/perf/util/debug.c  | 2 +-
 tools/perf/util/python.c | 1 +
 2 files changed, 2 insertions(+), 1 deletion(-)

diff --git a/tools/perf/util/debug.c b/tools/perf/util/debug.c
index 6b5ffe81f141..b7095519419e 100644
--- a/tools/perf/util/debug.c
+++ b/tools/perf/util/debug.c
@@ -55,7 +55,7 @@ FILE *debug_file(void)
 {
 	if (!_debug_file) {
 		debug_set_file(stderr);
-		pr_warning_once("debug_file not set");
+		pr_warning_once("%s not set\n", __func__);
 	}
 	return _debug_file;
 }
diff --git a/tools/perf/util/python.c b/tools/perf/util/python.c
index 690a94fb4f62..95140dfaef9c 100644
--- a/tools/perf/util/python.c
+++ b/tools/perf/util/python.c
@@ -5157,6 +5157,7 @@ PyMODINIT_FUNC PyInit_perf(void)
 
 	/* The page_size is placed in util object. */
 	page_size = sysconf(_SC_PAGE_SIZE);
+	perf_debug_setup();
 
 	Py_INCREF(&pyrf_evlist__type);
 	PyModule_AddObject(module, "evlist", (PyObject *)&pyrf_evlist__type);
-- 
2.56.0.rc1.315.gc6ed9934b7-goog