linux-kernel - [PATCH] trace-cmd: Fix a warning about incompatible pointer type of load

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Date:   Mon, 24 Apr 2017 22:43:31 +0900
From:   Taeung Song <treeze.taeung@...il.com>
To:     Steven Rostedt <rostedt@...dmis.org>
Cc:     linux-kernel@...r.kernel.org, Taeung Song <treeze.taeung@...il.com>
Subject: [PATCH] trace-cmd: Fix a warning about incompatible pointer type of load_plugin()

Currently the return type of load_plugin() in plugin_python.c is void type,
but it is different from the argument type of trace_util_load_plugins().
So fix it for the below warning.

  /home/taeung/git/opensource/trace-cmd/plugin_python.c: In function ‘pevent_plugin_loader’:
  /home/taeung/git/opensource/trace-cmd/plugin_python.c:95:41: warning: passing argument 3 of ‘trace_util_load_plugins’ from incompatible pointer type [-Wincompatible-pointer-types]
    trace_util_load_plugins(pevent, ".py", load_plugin, globals);
                                         ^
  In file included from /home/taeung/git/opensource/trace-cmd/plugin_python.c:3:0:
  /home/taeung/git/opensource/trace-cmd/trace-cmd.h:300:5: note: expected ‘int (*)(struct pevent *, const char *, const char *, void *)’ but argument is of type ‘void (*)(struct pevent *,   const char *, const char *, void *)’
   int trace_util_load_plugins(struct pevent *pevent, const char *suffix,
     ^

Signed-off-by: Taeung Song <treeze.taeung@...il.com>
---
 plugin_python.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/plugin_python.c b/plugin_python.c
index da07d27..d736f50 100644
--- a/plugin_python.c
+++ b/plugin_python.c
@@ -20,7 +20,7 @@ static const char pyload[] =
 "finally:\n"
 "   file.close()\n";
 
-static void load_plugin(struct pevent *pevent, const char *path,
+static int load_plugin(struct pevent *pevent, const char *path,
 			const char *name, void *data)
 {
 	PyObject *globals = data;
@@ -32,7 +32,7 @@ static void load_plugin(struct pevent *pevent, const char *path,
 	PyObject *res;
 
 	if (!full || !n)
-		return;
+		return -ENOMEM;
 
 	strcpy(full, path);
 	strcat(full, "/");
@@ -43,16 +43,18 @@ static void load_plugin(struct pevent *pevent, const char *path,
 
 	asprintf(&load, pyload, full, n);
 	if (!load)
-		return;
+		return -1;
 
 	res = PyRun_String(load, Py_file_input, globals, globals);
 	if (!res) {
 		fprintf(stderr, "failed loading %s\n", full);
 		PyErr_Print();
+		return -1;
 	} else
 		Py_DECREF(res);
 
 	free(load);
+	return 0;
 }
 
 int PEVENT_PLUGIN_LOADER(struct pevent *pevent)
-- 
2.7.4