From: Shengming Hu hu.shengming@zte.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@vger.kernel.org Cc: wang.yaxin@zte.com.cn Cc: mhiramat@kernel.org Cc: mark.rutland@arm.com Cc: mathieu.desnoyers@efficios.com Cc: zhang.run@zte.com.cn Cc: yang.yang29@zte.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@zte.com.cn Signed-off-by: Steven Rostedt (Google) rostedt@goodmis.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 }