From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932150AbbJPJLw (ORCPT ); Fri, 16 Oct 2015 05:11:52 -0400 Received: from mout01.posteo.de ([185.67.36.65]:59924 "EHLO mout01.posteo.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753168AbbJPJJH (ORCPT ); Fri, 16 Oct 2015 05:09:07 -0400 From: Martin Kepplinger To: mingo@kernel.org, akpm@linux-foundation.org, linux@horizon.com, linux@rasmusvillemoes.dk, maxime.coquelin@st.com, dvlasenk@redhat.com, yury.norov@gmail.com, torvalds@linux-foundation.org Cc: linux-kernel@vger.kernel.org, Martin Kepplinger , Martin Kepplinger Subject: [PATCH 5/5] arch: x86: use sign_extend64() for sign extension Date: Fri, 16 Oct 2015 11:07:07 +0200 Message-Id: <1444986427-12101-6-git-send-email-martink@posteo.de> X-Mailer: git-send-email 2.1.4 In-Reply-To: <1444986427-12101-1-git-send-email-martink@posteo.de> References: <1444986427-12101-1-git-send-email-martink@posteo.de> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Signed-off-by: Martin Kepplinger --- arch/x86/kernel/cpu/perf_event_msr.c | 7 +++---- 1 file changed, 3 insertions(+), 4 deletions(-) diff --git a/arch/x86/kernel/cpu/perf_event_msr.c b/arch/x86/kernel/cpu/perf_event_msr.c index f32ac13..ec863b9 100644 --- a/arch/x86/kernel/cpu/perf_event_msr.c +++ b/arch/x86/kernel/cpu/perf_event_msr.c @@ -163,10 +163,9 @@ again: goto again; delta = now - prev; - if (unlikely(event->hw.event_base == MSR_SMI_COUNT)) { - delta <<= 32; - delta >>= 32; /* sign extend */ - } + if (unlikely(event->hw.event_base == MSR_SMI_COUNT)) + delta = sign_extend64(delta, 31); + local64_add(now - prev, &event->count); } -- 2.1.4