6.18-stable review patch. If anyone has any objections, please let me know.
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From: Shengming Hu hu.shengming@zte.com.cn
commit b5d6d3f73d0bac4a7e3a061372f6da166fc6ee5c upstream.
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 Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- kernel/trace/fgraph.c | 1 + 1 file changed, 1 insertion(+)
--- a/kernel/trace/fgraph.c +++ b/kernel/trace/fgraph.c @@ -1019,6 +1019,7 @@ void fgraph_init_ops(struct ftrace_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 }