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

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Date: Wed, 14 Feb 2024 22:28:06 +0900
From: Masami Hiramatsu (Google) <mhiramat@...nel.org>
To: Steven Rostedt <rostedt@...dmis.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 Tue, 13 Feb 2024 20:42:18 -0500
Steven Rostedt <rostedt@...dmis.org> wrote:

> 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:

Thanks for pointing it out! Let me fix this in next version.

> 
> 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
> 


-- 
Masami Hiramatsu (Google) <mhiramat@...nel.org>