Re: [PATCH v7 10/36] ftrace/function_graph: Pass fgraph_ops to function graph callbacks

Steven Rostedt
2024-02-14T01:40:51Z

On Wed, 7 Feb 2024 00:09:21 +0900
"Masami Hiramatsu (Google)" <mhiramat@kernel.org> wrote:

> From: Steven Rostedt (VMware) <rostedt@goodmis.org>
>
> Pass the fgraph_ops structure to the function graph callbacks. This will
> allow callbacks to add a descriptor to a fgraph_ops private field that wil
> be added in the future and use it for the callbacks. This will be useful
> when more than one callback can be registered to the function graph tracer.
>
> Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
> Signed-off-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
> ---
> Changes in v2:
> - cleanup to set argument name on function prototype.
> ---
>

This patch fails to compile without this change:

diff --git a/kernel/trace/fgraph.c b/kernel/trace/fgraph.c
index e35a941a5af3..47b461b1cf7e 100644
--- a/kernel/trace/fgraph.c
+++ b/kernel/trace/fgraph.c
@@ -381,7 +381,7 @@ int function_graph_enter(unsigned long ret, unsigned long func,
if (gops == &fgraph_stub)
continue;

- if (gops->entryfunc(&trace))
+ if (gops->entryfunc(&trace, gops))
bitmap |= BIT(i);
}

-- Steve