linux-kernel - Re: [PATCH v7 10/36] ftrace/function_graph: Pass fgraph

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Date: Tue, 13 Feb 2024 20:42:18 -0500
From: Steven Rostedt <rostedt@...dmis.org>
To: "Masami Hiramatsu (Google)" <mhiramat@...nel.org>
Cc: Alexei Starovoitov <alexei.starovoitov@...il.com>, Florent Revest
 <revest@...omium.org>, linux-trace-kernel@...r.kernel.org, LKML
 <linux-kernel@...r.kernel.org>, Martin KaFai Lau <martin.lau@...ux.dev>,
 bpf <bpf@...r.kernel.org>, Sven Schnelle <svens@...ux.ibm.com>, Alexei
 Starovoitov <ast@...nel.org>, Jiri Olsa <jolsa@...nel.org>, Arnaldo
 Carvalho de Melo <acme@...nel.org>, Daniel Borkmann <daniel@...earbox.net>,
 Alan Maguire <alan.maguire@...cle.com>, Mark Rutland
 <mark.rutland@....com>, Peter Zijlstra <peterz@...radead.org>, Thomas
 Gleixner <tglx@...utronix.de>, Guo Ren <guoren@...nel.org>
Subject: Re: [PATCH v7 10/36] ftrace/function_graph: Pass fgraph_ops to
 function graph callbacks

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

> From: Steven Rostedt (VMware) <rostedt@...dmis.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@...dmis.org>
> Signed-off-by: Masami Hiramatsu (Google) <mhiramat@...nel.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