Received-SPF: pass (google.com: domain of linux-kernel+bounces-144785-linux.lists.archive=gmail.com@vger.kernel.org designates 2604:1380:45e3:2400::1 as permitted sender) client-ip=2604:1380:45e3:2400::1;
Date: Mon, 15 Apr 2024 04:44:30 -0400
From: Steven Rostedt <rostedt@goodmis.org>
To: Luca Ceresoli <luca.ceresoli@bootlin.com>
Cc: Masami Hiramatsu <mhiramat@kernel.org>, Mathieu Desnoyers
 <mathieu.desnoyers@efficios.com>, linux-kernel@vger.kernel.org,
 linux-trace-kernel@vger.kernel.org, Liam Girdwood <lgirdwood@gmail.com>,
 Mark Brown <broonie@kernel.org>, Thomas Petazzoni
 <thomas.petazzoni@bootlin.com>
Subject: Re: TP_printk() bug with %c, and more?
Message-ID: <20240415044431.308f2e09@rorschach.local.home>
In-Reply-To: <20240318164307.53c5595f@booty>
References: <20240315174900.14418f22@booty>
	<20240315132146.29edf416@gandalf.local.home>
	<20240315190312.2bd6a198@booty>
	<20240315145852.46125ac5@gandalf.local.home>
	<20240318164307.53c5595f@booty>
Precedence: bulk
MIME-Version: 1.0
Content-Type: text/plain; charset=US-ASCII
Content-Transfer-Encoding: 7bit

On Mon, 18 Mar 2024 16:43:07 +0100
Luca Ceresoli <luca.ceresoli@bootlin.com> wrote:

> However the arrows are still reversed.

This requires a kernel change. The problem is that the print fmt has:

print fmt: "%c%s %s %s %s %s", (int) REC->path_node && (int) REC->path_connect ? '*' : ' ', __get_str(wname), (((REC->path_dir) == SND_SOC_DAPM_DIR_OUT) ? "->" : "<-"), __get_str(pname), (((REC->path_dir) == SND_SOC_DAPM_DIR_OUT) ? "->" : "<-"), __get_str(pnname)

User space (trace-cmd and perf) have no idea what SND_SOC_DAPM_DIR_OUT
is. The kernel needs to convert that, otherwise the parsing will fail,
or it will default it to zero.

-- Steve