linux-kernel - Re: [RFC] ARC: initial ftrace support

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Message-ID: <20200327131020.79e68313@gandalf.local.home>
Date:   Fri, 27 Mar 2020 13:10:20 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Eugeniy Paltsev <Eugeniy.Paltsev@...opsys.com>
Cc:     linux-snps-arc@...ts.infradead.org,
        Vineet Gupta <Vineet.Gupta1@...opsys.com>,
        linux-kernel@...r.kernel.org,
        Alexey Brodkin <Alexey.Brodkin@...opsys.com>,
        Ingo Molnar <mingo@...hat.com>
Subject: Re: [RFC] ARC: initial ftrace support

On Fri, 27 Mar 2020 18:53:55 +0300
Eugeniy Paltsev <Eugeniy.Paltsev@...opsys.com> wrote:

> +
> +noinline void _mcount(unsigned long parent_ip)
> +{
> +	unsigned long ip = (unsigned long)__builtin_return_address(0);
> +
> +	if (unlikely(ftrace_trace_function != ftrace_stub))
> +		ftrace_trace_function(ip - MCOUNT_INSN_SIZE, parent_ip,
> +				      NULL, NULL);
> +}
> +EXPORT_SYMBOL(_mcount);

So, ARCv2 allows the _mcount code to be written in C? Nice!

-- Steve