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

Steven Rostedt
2024-02-15T15:38:12Z

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

> From: Masami Hiramatsu (Google) <mhiramat@kernel.org>
>
> 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@kernel.org>
>

> @@ -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;