From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752595AbaCFS7c (ORCPT ); Thu, 6 Mar 2014 13:59:32 -0500 Received: from mx1.redhat.com ([209.132.183.28]:34961 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751695AbaCFS7b (ORCPT ); Thu, 6 Mar 2014 13:59:31 -0500 Message-ID: <5318C50D.2010505@redhat.com> Date: Thu, 06 Mar 2014 13:57:17 -0500 From: Rik van Riel User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.1.0 MIME-Version: 1.0 To: Frederic Weisbecker , LKML CC: Ingo Molnar , Marcelo Tosatti , Peter Zijlstra , Thomas Gleixner Subject: Re: [PATCH 1/6] cputime: Fix nsecs_to_cputime() return type cast References: <1394128601-26034-1-git-send-email-fweisbec@gmail.com> <1394128601-26034-2-git-send-email-fweisbec@gmail.com> In-Reply-To: <1394128601-26034-2-git-send-email-fweisbec@gmail.com> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 03/06/2014 12:56 PM, Frederic Weisbecker wrote: > Even though nsec based cputime_t maps to u64, nsecs_to_cputime() must > return a cputime_t value. We want to enforce this kind of cast in order > to track down buggy manipulations of cputime_t such as direct access > of its values under wrong assumptions on its backend type (nsecs, > jiffies, etc...) by core code. > > Cc: Ingo Molnar > Cc: Marcelo Tosatti > Cc: Peter Zijlstra > Cc: Thomas Gleixner > Signed-off-by: Frederic Weisbecker Acked-by: Rik van Riel