From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1759564Ab2IEVfL (ORCPT ); Wed, 5 Sep 2012 17:35:11 -0400 Received: from mail-ee0-f74.google.com ([74.125.83.74]:37472 "EHLO mail-ee0-f74.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1759468Ab2IEVfI (ORCPT ); Wed, 5 Sep 2012 17:35:08 -0400 From: Mandeep Singh Baines To: Kukjin Kim , linux-kernel@vger.kernel.org Cc: Mandeep Singh Baines , Sonny Rao , Olof Johansson , Russell King , linux-arm-kernel@lists.infradead.org, linux-samsung-soc@vger.kernel.org Subject: [PATCH] ARM: exynos: mct: cache mct upper count Date: Wed, 5 Sep 2012 14:34:54 -0700 Message-Id: <1346880894-31316-1-git-send-email-msb@chromium.org> X-Mailer: git-send-email 1.7.7.3 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Saves one register read. BUG=none TEST=See below. Before (perf report): 1.40% [k] exynos4_frc_read | |--87.20%-- ktime_get_ts | | | |--93.60%-- posix_ktime_get_ts After (perf report): 1.00% [k] exynos4_frc_read | |--88.61%-- ktime_get_ts | | | |--92.70%-- posix_ktime_get_ts Signed-off-by: Mandeep Singh Baines CC: Sonny Rao CC: Olof Johansson CC: Kukjin Kim CC: Russell King CC: linux-arm-kernel@lists.infradead.org CC: linux-samsung-soc@vger.kernel.org --- arch/arm/mach-exynos/mct.c | 4 ++-- 1 files changed, 2 insertions(+), 2 deletions(-) diff --git a/arch/arm/mach-exynos/mct.c b/arch/arm/mach-exynos/mct.c index b601fb8..2bbd533 100644 --- a/arch/arm/mach-exynos/mct.c +++ b/arch/arm/mach-exynos/mct.c @@ -128,8 +128,8 @@ static void exynos4_mct_frc_start(u32 hi, u32 lo) static cycle_t exynos4_frc_read(struct clocksource *cs) { - unsigned int lo, hi; - u32 hi2 = __raw_readl(EXYNOS4_MCT_G_CNT_U); + u32 lo, hi; + static u32 hi2; do { hi = hi2; -- 1.7.7.3