linux-kernel - Re: [PATCH v2] function_graph: Fix args pointer mismatch in print_graph

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Message-ID: <CAErzpmtHCE=o0Gv3iTMaShtvNep0NTKLenE0nvWv+sz6s=NWFQ@mail.gmail.com>
Date: Fri, 30 Jan 2026 09:13:21 +0800
From: Donglin Peng <dolinux.peng@...il.com>
To: Steven Rostedt <rostedt@...dmis.org>
Cc: mhiramat@...nel.org, linux-trace-kernel@...r.kernel.org, 
	linux-kernel@...r.kernel.org, Donglin Peng <pengdonglin@...omi.com>
Subject: Re: [PATCH v2] function_graph: Fix args pointer mismatch in print_graph_retval()

On Sat, Jan 24, 2026 at 1:18 AM Steven Rostedt <rostedt@...dmis.org> wrote:
>
> On Mon, 12 Jan 2026 10:16:01 +0800
> Donglin Peng <dolinux.peng@...il.com> wrote:
>
> > From: Donglin Peng <pengdonglin@...omi.com>
> >
> > When funcgraph-args and funcgraph-retaddr are both enabled, many kernel
> > functions display invalid parameters in trace logs[1].
> >
> > The issue occurs because print_graph_retval() passes a mismatched args
> > pointer to print_function_args(). Fix this by retrieving the correct
> > args pointer using the FGRAPH_ENTRY_ARGS() macro.
> >
> > [1] https://gitee.com/pengdonglin137/funcgraph_visualization/raw/master/samples/error_args.png
>
> Please do not provide links to images. This stays in the git logs for the
> lifetime of the Linux kernel. Images like this will likely not live as long
> and the link becomes wasted space in the git history.

Thanks for pointing this out.

>
> Either do a cut and paste of the bad output, or don't include it at all.

Thanks.

>
> -- Steve
>
>
> > Fixes: f83ac7544fbf ("function_graph: Enable funcgraph-args and funcgraph-retaddr to work simultaneously")
> > Signed-off-by: Donglin Peng <pengdonglin@...omi.com>