From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail.linuxfoundation.org ([140.211.169.12]:53011 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S938619AbcIEQyR (ORCPT ); Mon, 5 Sep 2016 12:54:17 -0400 From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Vineet Gupta Subject: [PATCH 4.7 096/143] ARC: Elide redundant setup of DMA callbacks Date: Mon, 5 Sep 2016 18:44:32 +0200 Message-Id: <20160905164434.678755169@linuxfoundation.org> In-Reply-To: <20160905164430.593075551@linuxfoundation.org> References: <20160905164430.593075551@linuxfoundation.org> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Sender: stable-owner@vger.kernel.org List-ID: 4.7-stable review patch. If anyone has any objections, please let me know. ------------------ From: Vineet Gupta commit 45c3b08a117e2232fc8d7b9e849ead36386f4f96 upstream. For resources shared by all cores such as SLC and IOC, only the master core needs to do any setups / enabling / disabling etc. Signed-off-by: Vineet Gupta Signed-off-by: Greg Kroah-Hartman --- arch/arc/mm/cache.c | 9 +++++++++ 1 file changed, 9 insertions(+) --- a/arch/arc/mm/cache.c +++ b/arch/arc/mm/cache.c @@ -921,6 +921,15 @@ void arc_cache_init(void) printk(arc_cache_mumbojumbo(0, str, sizeof(str))); + /* + * Only master CPU needs to execute rest of function: + * - Assume SMP so all cores will have same cache config so + * any geomtry checks will be same for all + * - IOC setup / dma callbacks only need to be setup once + */ + if (cpu) + return; + if (IS_ENABLED(CONFIG_ARC_HAS_ICACHE)) { struct cpuinfo_arc_cache *ic = &cpuinfo_arc700[cpu].icache;