linux-kernel - Re: [PATCH v7] function_graph: Enable funcgraph-args and funcgraph-retaddr to work simultaneously

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Message-ID: <20251124164701.1216a073@gandalf.local.home>
Date: Mon, 24 Nov 2025 16:47:01 -0500
From: Steven Rostedt <rostedt@...dmis.org>
To: Donglin Peng <dolinux.peng@...il.com>
Cc: linux-trace-kernel@...r.kernel.org, linux-kernel@...r.kernel.org,
 Donglin Peng <pengdonglin@...omi.com>, Sven Schnelle <svens@...ux.ibm.com>,
 Masami Hiramatsu <mhiramat@...nel.org>
Subject: Re: [PATCH v7] function_graph: Enable funcgraph-args and
 funcgraph-retaddr to work simultaneously

On Fri, 14 Nov 2025 10:55:22 +0800
Donglin Peng <dolinux.peng@...il.com> wrote:

> --- a/kernel/trace/trace_entries.h
> +++ b/kernel/trace/trace_entries.h
> @@ -95,14 +95,14 @@ FTRACE_ENTRY_PACKED(fgraph_retaddr_entry, fgraph_retaddr_ent_entry,
>  	TRACE_GRAPH_RETADDR_ENT,
>  
>  	F_STRUCT(
> -		__field_struct(	struct fgraph_retaddr_ent,	graph_ent	)
> +		__field_struct(	struct ftrace_graph_ent,	graph_ent	)
>  		__field_packed(	unsigned long,	graph_ent,	func		)
>  		__field_packed(	unsigned int,	graph_ent,	depth		)
> -		__field_packed(	unsigned long,	graph_ent,	retaddr		)

You can't delete the retaddr without breaking user space.

Please keep that here.

Thanks,

-- Steve

> +		__dynamic_array(unsigned long,	args				)
>  	),
>  
>  	F_printk("--> %ps (%u) <- %ps", (void *)__entry->func, __entry->depth,
> -		(void *)__entry->retaddr)
> +		(void *)__entry->args[0])
>  );
>