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 S932128AbbCXPta (ORCPT <rfc822;w@1wt.eu>);
	Tue, 24 Mar 2015 11:49:30 -0400
Received: from bombadil.infradead.org ([198.137.202.9]:42893 "EHLO
	bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org
	with ESMTP id S1752802AbbCXPtY (ORCPT
	<rfc822;linux-kernel@vger.kernel.org>);
	Tue, 24 Mar 2015 11:49:24 -0400
Date: Tue, 24 Mar 2015 16:48:55 +0100
From: Peter Zijlstra <peterz@infradead.org>
To: John Stultz <john.stultz@linaro.org>
Cc: Thomas Gleixner <tglx@linutronix.de>,
        =?utf-8?B?UGF3ZcWC?= Moll <pawel.moll@arm.com>,
        Adrian Hunter <adrian.hunter@intel.com>,
        Ingo Molnar <mingo@kernel.org>, Stephane Eranian <eranian@google.com>,
        lkml <linux-kernel@vger.kernel.org>,
        Arnaldo Carvalho de Melo <acme@kernel.org>,
        David Ahern <dsahern@gmail.com>,
        =?iso-8859-1?Q?Fr=E9d=E9ric?= Weisbecker <fweisbec@gmail.com>,
        Jiri Olsa <jolsa@redhat.com>, Namhyung Kim <namhyung@gmail.com>,
        Paul Mackerras <paulus@samba.org>,
        Steven Rostedt <rostedt@goodmis.org>,
        Sonny Rao <sonnyrao@chromium.org>,
        "ak@linux.intel.com" <ak@linux.intel.com>, vincent.weaver@maine.edu
Subject: Re: [RFC][PATCH 0/4] Another go at ktime_get_raw_fast_ns()
Message-ID: <20150324154855.GQ21418@twins.programming.kicks-ass.net>
References: <20150319093137.149794496@infradead.org>
 <CALAqxLU3M5BU_nS6wbnw4CRSY3g-59N3Wj6xxwsjHm095WjVCA@mail.gmail.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <CALAqxLU3M5BU_nS6wbnw4CRSY3g-59N3Wj6xxwsjHm095WjVCA@mail.gmail.com>
User-Agent: Mutt/1.5.21 (2012-12-30)
Sender: linux-kernel-owner@vger.kernel.org
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org

On Tue, Mar 24, 2015 at 08:20:07AM -0700, John Stultz wrote:
> On Thu, Mar 19, 2015 at 2:31 AM, Peter Zijlstra <peterz@infradead.org> wrote:
> > Hi John,
> >
> > So yeah, I just didn't try hard enough it seems; how about this?
> 
> Yea, this looks much better!  I'll queue it up for testing and if that
> goes well include it for 4.1.

I have a few patches that depend on it, so if you're ok with it I'd like
to carry the lot. But yes please test ;-)

> > Also, I think we should double check that everything passed to
> > tk_setup_internals(.clock) is either static storage or RCU-sched freed,
> > because with the whole latch thing one CPUs (fast) access might still be
> > in progress while the other is freeing the clock struct.
> >
> > Not sure what the lifetime rules of struct clocksource are here.
> 
> At one point it was install and never remove, but I think Thomas
> changed that awhile back, so I think your concern here is a good one.

OK, I'll try and dig around a bit on this.