linux-kernel - Re: kernel/trace/fgraph.c:834 __ftrace_return_to_handler() error: we previously assumed 'fregs' could be null (see line 830)

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Message-ID: <20260105102304.54559915@gandalf.local.home>
Date: Mon, 5 Jan 2026 10:23:04 -0500
From: Steven Rostedt <rostedt@...dmis.org>
To: Dan Carpenter <dan.carpenter@...aro.org>
Cc: Masami Hiramatsu <mhiramat@...nel.org>, oe-kbuild@...ts.linux.dev,
 lkp@...el.com, oe-kbuild-all@...ts.linux.dev, linux-kernel@...r.kernel.org
Subject: Re: kernel/trace/fgraph.c:834 __ftrace_return_to_handler() error:
 we previously assumed 'fregs' could be null (see line 830)

On Mon, 5 Jan 2026 18:15:56 +0300
Dan Carpenter <dan.carpenter@...aro.org> wrote:

> We could just ignore this...  The explanation is on the list if people
> have questions.
> 
> The problem is that this is only called from assembly which smatch
> doesn't understand.

I also think this can cause people looking at this code to get confused by
the check. At least a comment should be added.

-- Steve