linux-kernel - Re: [PATCH] dynamic debug: allow printing to trace event

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Date:   Wed, 22 Jul 2020 15:58:22 +0206
From:   John Ogness <john.ogness@...utronix.de>
To:     Steven Rostedt <rostedt@...dmis.org>,
        Vincent Whitchurch <vincent.whitchurch@...s.com>
Cc:     jbaron@...mai.com, mingo@...hat.com, kernel@...s.com,
        corbet@....net, linux-kernel@...r.kernel.org,
        Petr Mladek <pmladek@...e.com>,
        Sergey Senozhatsky <sergey.senozhatsky@...il.com>
Subject: Re: [PATCH] dynamic debug: allow printing to trace event

On 2020-07-21, Steven Rostedt <rostedt@...dmis.org> wrote:
>> diff --git a/lib/dynamic_debug.c b/lib/dynamic_debug.c
>> index 321437bbf87d..9f6d8867af7c 100644
>> --- a/lib/dynamic_debug.c
>> +++ b/lib/dynamic_debug.c
[..]
>> +static void dynamic_printk(unsigned int flags, const char *fmt, ...)
>> +{
>> +	if (flags & _DPRINTK_FLAGS_TRACE) {
>> +		va_list args;
>> +
>> +		va_start(args, fmt);
>> +		/*
>> +		 * All callers include the KERN_DEBUG prefix to keep the
>> +		 * vprintk case simple; strip it out for tracing.
>> +		 */
>> +		dynamic_trace(fmt + strlen(KERN_DEBUG), args);

Do we really need a separate tracing event for this? Why not just:

                ftrace_vprintk(fmt + strlen(KERN_DEBUG), args);

John Ogness