Re: [PATCH v7 23/36] function_graph: Add a new exit handler with parent_ip and ftrace_regs

[Steven Rostedt]

On Wed,  7 Feb 2024 00:11:44 +0900
"Masami Hiramatsu (Google)" <mhiramat@xxxxxxxxxx> wrote:

> From: Masami Hiramatsu (Google) <mhiramat@xxxxxxxxxx>
> 
> Add a new return handler to fgraph_ops as 'retregfunc'  which takes
> parent_ip and ftrace_regs instead of ftrace_graph_ret. This handler
> is available only if the arch support CONFIG_HAVE_FUNCTION_GRAPH_FREGS.
> Note that the 'retfunc' and 'reregfunc' are mutual exclusive.
> You can set only one of them.
> 
> Signed-off-by: Masami Hiramatsu (Google) <mhiramat@xxxxxxxxxx>
>

> @@ -1076,6 +1083,7 @@ struct fgraph_ops {
>  	trace_func_graph_ent_t		entryfunc;
>  	trace_func_graph_ret_t		retfunc;
>  	trace_func_graph_regs_ent_t	entryregfunc;
> +	trace_func_graph_regs_ret_t	retregfunc;

Same for this:

struct fgraph_ops {
	union {
		trace_func_graph_ent_t		entryfunc;
		trace_func_graph_regs_ent_t	entryregfunc;
	};
	union {
		trace_func_graph_ret_t		retfunc;
		trace_func_graph_regs_ret_t	retregfunc;
	}

-- Steve


>  	struct ftrace_ops		ops; /* for the hash lists */
>  	void				*private;
>  	int				idx;