From: Shengming Hu <[email protected]> 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. Signed-off-by: Shengming Hu <[email protected]> --- kernel/trace/fgraph.c | 1 + 1 file changed, 1 insertion(+) diff --git a/kernel/trace/fgraph.c b/kernel/trace/fgraph.c index 7fb9b169d..f6f25d81a 100644 --- a/kernel/trace/fgraph.c +++ b/kernel/trace/fgraph.c @@ -1016,6 +1016,7 @@ 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 } -- 2.25.1
