linux-kernel - [for-linus][PATCH 1/2] fgraph: Initialize ftrace

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Message-ID: <20251127010220.147209669@kernel.org>
Date: Wed, 26 Nov 2025 20:02:04 -0500
From: Steven Rostedt <rostedt@...nel.org>
To: linux-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>,
 stable@...r.kernel.org,
  <wang.yaxin@....com.cn>,
  <zhang.run@....com.cn>,
  <yang.yang29@....com.cn>,
 Shengming Hu <hu.shengming@....com.cn>
Subject: [for-linus][PATCH 1/2] fgraph: Initialize ftrace_ops->private for function graph ops

From: Shengming Hu <hu.shengming@....com.cn>

The ftrace_pids_enabled(op) check relies on op->private being properly
initialized, but fgraph_ops's underlying ftrace_ops->private was left
uninitialized. This caused ftrace_pids_enabled() to always return false,
effectively disabling PID filtering for function graph tracing.

Fix this by copying src_ops->private to dst_ops->private in
fgraph_init_ops(), ensuring PID filter state is correctly propagated.

Cc: stable@...r.kernel.org
Cc: <wang.yaxin@....com.cn>
Cc: <mhiramat@...nel.org>
Cc: <mark.rutland@....com>
Cc: <mathieu.desnoyers@...icios.com>
Cc: <zhang.run@....com.cn>
Cc: <yang.yang29@....com.cn>
Fixes: c132be2c4fcc1 ("function_graph: Have the instances use their own ftrace_ops for filtering")
Link: https://patch.msgid.link/20251126172926004y3hC8QyU4WFOjBkU_UxLC@zte.com.cn
Signed-off-by: Shengming Hu <hu.shengming@....com.cn>
Signed-off-by: Steven Rostedt (Google) <rostedt@...dmis.org>
---
 kernel/trace/fgraph.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/kernel/trace/fgraph.c b/kernel/trace/fgraph.c
index 484ad7a18463..d6222bb99d1d 100644
--- a/kernel/trace/fgraph.c
+++ b/kernel/trace/fgraph.c
@@ -1019,6 +1019,7 @@ void fgraph_init_ops(struct ftrace_ops *dst_ops,
 		mutex_init(&dst_ops->local_hash.regex_lock);
 		INIT_LIST_HEAD(&dst_ops->subop_list);
 		dst_ops->flags |= FTRACE_OPS_FL_INITIALIZED;
+		dst_ops->private = src_ops->private;
 	}
 #endif
 }
-- 
2.51.0