linux-kernel - [PATCH 1/6] ftrace: Declare function_trace

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Message-ID: <20240605202708.289105647@goodmis.org>
Date: Wed, 05 Jun 2024 16:26:45 -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>
Subject: [PATCH 1/6] ftrace: Declare function_trace_op in header to quiet sparse warning

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

Sparse complains that function_trace_op is not static but is not declared
in a header file. It is used only in assembly code. But add it to a header
so that sparse no longer complains:

 kernel/trace/ftrace.c:99:19: warning: symbol 'function_trace_op' was not declared. Should it be static?

Signed-off-by: Steven Rostedt (Google) <rostedt@...dmis.org>
---
 include/linux/ftrace.h | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/include/linux/ftrace.h b/include/linux/ftrace.h
index 9f61556a9491..4135dc171447 100644
--- a/include/linux/ftrace.h
+++ b/include/linux/ftrace.h
@@ -1131,6 +1131,9 @@ extern void ftrace_graph_init_task(struct task_struct *t);
 extern void ftrace_graph_exit_task(struct task_struct *t);
 extern void ftrace_graph_init_idle_task(struct task_struct *t, int cpu);
 
+/* Used by assembly, but to quiet sparse warnings */
+extern struct ftrace_ops *function_trace_op;
+
 static inline void pause_graph_tracing(void)
 {
 	atomic_inc(&current->tracing_graph_pause);
-- 
2.43.0