From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932408AbbJ0NXe (ORCPT ); Tue, 27 Oct 2015 09:23:34 -0400 Received: from szxga03-in.huawei.com ([119.145.14.66]:20825 "EHLO szxga03-in.huawei.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932072AbbJ0NXd (ORCPT ); Tue, 27 Oct 2015 09:23:33 -0400 From: Yang Yingliang To: , CC: Yang Yingliang , Thomas Gleixner Subject: [PATCH 1/2] clocksource: replace cycle_last validation with an equal way Date: Tue, 27 Oct 2015 21:21:12 +0800 Message-ID: <1445952073-7260-2-git-send-email-yangyingliang@huawei.com> X-Mailer: git-send-email 1.9.5.msysgit.1 In-Reply-To: <1445952073-7260-1-git-send-email-yangyingliang@huawei.com> References: <1445952073-7260-1-git-send-email-yangyingliang@huawei.com> MIME-Version: 1.0 Content-Type: text/plain X-Originating-IP: [10.177.19.219] X-CFilter-Loop: Reflected X-Mirapoint-Virus-RAPID-Raw: score=unknown(0), refid=str=0001.0A090201.562F7A5C.00A5,ss=1,re=0.000,recu=0.000,reip=0.000,cl=1,cld=1,fgs=0, ip=0.0.0.0, so=2013-05-26 15:14:31, dmn=2013-03-21 17:37:32 X-Mirapoint-Loop-Id: b31e9e95df7d9c4a919b09ff687c50a0 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Mask the cycle values before subtraction. So we can use this validation while the clocksource mask is not 64-bits. Signed-off-by: Yang Yingliang Cc: Thomas Gleixner --- kernel/time/timekeeping_internal.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/kernel/time/timekeeping_internal.h b/kernel/time/timekeeping_internal.h index 4ea005a..984f02e 100644 --- a/kernel/time/timekeeping_internal.h +++ b/kernel/time/timekeeping_internal.h @@ -15,7 +15,7 @@ extern void tk_debug_account_sleep_time(struct timespec64 *t); #ifdef CONFIG_CLOCKSOURCE_VALIDATE_LAST_CYCLE static inline cycle_t clocksource_delta(cycle_t now, cycle_t last, cycle_t mask) { - cycle_t ret = (now - last) & mask; + cycle_t ret = (now & mask) - (last & mask); return (s64) ret > 0 ? ret : 0; } -- 2.5.0