From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754505AbaBZTMx (ORCPT ); Wed, 26 Feb 2014 14:12:53 -0500 Received: from mga02.intel.com ([134.134.136.20]:20204 "EHLO mga02.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753498AbaBZTJB (ORCPT ); Wed, 26 Feb 2014 14:09:01 -0500 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="4.97,549,1389772800"; d="scan'208";a="490301619" From: Ross Zwisler To: linux-kernel@vger.kernel.org Cc: Ross Zwisler , H Peter Anvin , Ingo Molnar , Thomas Gleixner Subject: [PATCH 2/4] x86: Use clflushopt in clflush_cache_range Date: Wed, 26 Feb 2014 12:06:50 -0700 Message-Id: <1393441612-19729-3-git-send-email-ross.zwisler@linux.intel.com> X-Mailer: git-send-email 1.7.10.4 In-Reply-To: <1393441612-19729-1-git-send-email-ross.zwisler@linux.intel.com> References: <1393441612-19729-1-git-send-email-ross.zwisler@linux.intel.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org If clflushopt is available on the system, use it instead of clflush in clflush_cache_range. Signed-off-by: Ross Zwisler Cc: H Peter Anvin Cc: Ingo Molnar Cc: Thomas Gleixner --- arch/x86/mm/pageattr.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/arch/x86/mm/pageattr.c b/arch/x86/mm/pageattr.c index bb32480..11d500a 100644 --- a/arch/x86/mm/pageattr.c +++ b/arch/x86/mm/pageattr.c @@ -125,8 +125,8 @@ within(unsigned long addr, unsigned long start, unsigned long end) * @vaddr: virtual start address * @size: number of bytes to flush * - * clflush is an unordered instruction which needs fencing with mfence - * to avoid ordering issues. + * clflushopt is an unordered instruction which needs fencing with mfence or + * sfence to avoid ordering issues. */ void clflush_cache_range(void *vaddr, unsigned int size) { @@ -135,11 +135,11 @@ void clflush_cache_range(void *vaddr, unsigned int size) mb(); for (; vaddr < vend; vaddr += boot_cpu_data.x86_clflush_size) - clflush(vaddr); + clflushopt(vaddr); /* * Flush any possible final partial cacheline: */ - clflush(vend); + clflushopt(vend); mb(); } -- 1.7.10.4