tracing/kprobes: Fix build error when find_module() is not available

BugLink: https://bugs.launchpad.net/bugs/2086138

commit b10545b upstream.

The kernel test robot reported that the find_module() is not available
if CONFIG_MODULES=n.
Fix this error by hiding find_modules() in #ifdef CONFIG_MODULES with
related rcu locks as try_module_get_by_name().

Link: https://lore.kernel.org/all/172056819167.201571.250053007194508038.stgit@devnote2/

Reported-by: kernel test robot <[email protected]>
Closes: https://lore.kernel.org/oe-kbuild-all/[email protected]/
Closes: https://lore.kernel.org/oe-kbuild-all/[email protected]/
Signed-off-by: Masami Hiramatsu (Google) <[email protected]>
Cc: Thorsten Leemhuis <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
Signed-off-by: Koichiro Den <[email protected]>
Signed-off-by: Roxana Nicolescu <[email protected]>

kernel/trace/trace_kprobe.c

@@ -776,6 +776,24 @@ static int validate_module_probe_symbol(const char *modname, const char *symbol)
 	return 0;
 }
 
+#ifdef CONFIG_MODULES
+/* Return NULL if the module is not loaded or under unloading. */
+static struct module *try_module_get_by_name(const char *name)
+{
+	struct module *mod;
+
+	rcu_read_lock_sched();
+	mod = find_module(name);
+	if (mod && !try_module_get(mod))
+		mod = NULL;
+	rcu_read_unlock_sched();
+
+	return mod;
+}
+#else
+#define try_module_get_by_name(name)	(NULL)
+#endif
+
 static int validate_probe_symbol(char *symbol)
 {
 	struct module *mod = NULL;
@@ -787,12 +805,7 @@ static int validate_probe_symbol(char *symbol)
 		modname = symbol;
 		symbol = p + 1;
 		*p = '\0';
-		/* Return 0 (defer) if the module does not exist yet. */
-		rcu_read_lock_sched();
-		mod = find_module(modname);
-		if (mod && !try_module_get(mod))
-			mod = NULL;
-		rcu_read_unlock_sched();
+		mod = try_module_get_by_name(modname);
 		if (!mod)
 			goto out;
 	}