linux-kernel - [PATCH 6/6] function_graph: Do not update pid func if CONFIG_DYNAMIC

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Message-ID: <20240605202709.096020676@goodmis.org>
Date: Wed, 05 Jun 2024 16:26:50 -0400
From: Steven Rostedt <rostedt@...dmis.org>
To: linux-kernel@...r.kernel.org,
 linux-trace-kernel@...r.kernel.org
Cc: Masami Hiramatsu <mhiramat@...nel.org>,
 Mark Rutland <mark.rutland@....com>,
 Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
 Andrew Morton <akpm@...ux-foundation.org>,
 kernel test robot <lkp@...el.com>
Subject: [PATCH 6/6] function_graph: Do not update pid func if CONFIG_DYNAMIC_FTRACE not
 enabled

From: "Steven Rostedt (Google)" <rostedt@...dmis.org>

The ftrace subops is only defined if CONFIG_DYNAMIC_FTRACE is enabled. If
it is not, function tracing is extremely limited, and the subops in the
ftrace_ops structure is not defined (and will fail to compile). If
DYNAMIC_FTRACE is not enabled, then function graph filtering will not
work (as it shouldn't).

Fixes: df3ec5da6a1e7 ("function_graph: Add pid tracing back to function graph tracer")
Reported-by: kernel test robot <lkp@...el.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202406051855.9VIYXbTB-lkp@intel.com/
Signed-off-by: Steven Rostedt (Google) <rostedt@...dmis.org>
---
 kernel/trace/fgraph.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/kernel/trace/fgraph.c b/kernel/trace/fgraph.c
index 63d828054c79..c0e428c87ea5 100644
--- a/kernel/trace/fgraph.c
+++ b/kernel/trace/fgraph.c
@@ -1177,6 +1177,7 @@ void fgraph_update_pid_func(void)
 	if (!(graph_ops.flags & FTRACE_OPS_FL_INITIALIZED))
 		return;
 
+#ifdef CONFIG_DYNAMIC_FTRACE
 	list_for_each_entry(op, &graph_ops.subop_list, list) {
 		if (op->flags & FTRACE_OPS_FL_PID) {
 			gops = container_of(op, struct fgraph_ops, ops);
@@ -1186,6 +1187,7 @@ void fgraph_update_pid_func(void)
 				static_call_update(fgraph_func, gops->entryfunc);
 		}
 	}
+#endif
 }
 
 /* Allocate a return stack for each task */
-- 
2.43.0