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 S1751856AbbD3KyI (ORCPT <rfc822;w@1wt.eu>);
	Thu, 30 Apr 2015 06:54:08 -0400
Received: from 251.110.2.81.in-addr.arpa ([81.2.110.251]:33904 "EHLO
	lxorguk.ukuu.org.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org
	with ESMTP id S1751115AbbD3KyF (ORCPT
	<rfc822;linux-kernel@vger.kernel.org>);
	Thu, 30 Apr 2015 06:54:05 -0400
Date: Thu, 30 Apr 2015 11:53:45 +0100
From: One Thousand Gnomes <gnomes@lxorguk.ukuu.org.uk>
To: Trevor Cordes <trevor@tecnopolis.ca>
Cc: linux-kernel@vger.kernel.org, John Stultz <john.stultz@linaro.org>,
        Thomas Gleixner <tglx@linutronix.de>, Josh Boyer <jwboyer@redhat.com>
Subject: Re: regression in ktime.h circa 3.16.0-rc5+ breaks lirc irsend, bad
 commit 166afb64511
Message-ID: <20150430115345.1204406e@lxorguk.ukuu.org.uk>
In-Reply-To: <20150429232721.59b89cb1@pog.tecnopolis.ca>
References: <20150323165725.GA25008@pog.tecnopolis.ca>
	<20150429232721.59b89cb1@pog.tecnopolis.ca>
Organization: Intel Corporation
X-Mailer: Claws Mail 3.11.1 (GTK+ 2.24.27; x86_64-redhat-linux-gnu)
MIME-Version: 1.0
Content-Type: text/plain; charset=US-ASCII
Content-Transfer-Encoding: 7bit
Sender: linux-kernel-owner@vger.kernel.org
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org

> > Obviously my patch isn't the real solution, the real solution is to
> > make the new function calls use a consistent 64-bit type, or figure
> > out what in my code path is calling these functions and check it for
> > value sanity.

I would be tempted to do both computations and print then inputs as well
as do a WARN_ON when they differ. That will give you a stack trace of the
offender, and providing you return the "correct" value you can see how it
continues functioning afterwards.

Alan