From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <linux-kernel-owner@vger.kernel.org>
Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand
        id S1750905AbdKHILK (ORCPT <rfc822;w@1wt.eu>);
        Wed, 8 Nov 2017 03:11:10 -0500
Received: from bombadil.infradead.org ([65.50.211.133]:60632 "EHLO
        bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org
        with ESMTP id S1750720AbdKHILJ (ORCPT
        <rfc822;linux-kernel@vger.kernel.org>);
        Wed, 8 Nov 2017 03:11:09 -0500
Date: Wed, 8 Nov 2017 09:10:58 +0100
From: Peter Zijlstra <peterz@infradead.org>
To: Steven Rostedt <rostedt@goodmis.org>
Cc: Abderrahmane Benbachir <abderrahmane.benbachir@polymtl.ca>,
        linux-kernel@vger.kernel.org, mingo@redhat.com,
        mathieu.desnoyers@efficios.com, Thomas Gleixner <tglx@linutronix.de>
Subject: Re: [RFC PATCH v2] ftrace: support very early function tracing
Message-ID: <20171108081058.GT3165@worktop.lehotels.local>
References: <1510098245.14960.3.camel@polymtl.ca>
 <20171107211706.328d7dd0@gandalf.local.home>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <20171107211706.328d7dd0@gandalf.local.home>
User-Agent: Mutt/1.5.22.1 (2013-10-16)
Sender: linux-kernel-owner@vger.kernel.org
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org

On Tue, Nov 07, 2017 at 09:17:06PM -0500, Steven Rostedt wrote:
> > +#ifdef CONFIG_X86_TSC
> > +	entry->clock = rdtsc();
> > +#else
> > +	entry->clock = trace_clock_local();
> > +#endif

> > +#ifdef CONFIG_X86_TSC
> > +	cpu_khz = native_calibrate_cpu();
> > +#endif

> > +#ifdef CONFIG_X86_TSC
> > +		ns = cycles_to_ns(entry->clock, cpu_khz);
> > +#else
> > +		ns = entry->clock;
> > +#endif

Yeah, no, not going to happen...