From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail.linuxfoundation.org ([140.211.169.12]:48171 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932749AbcIENgI (ORCPT ); Mon, 5 Sep 2016 09:36:08 -0400 Subject: Patch "ARC: Elide redundant setup of DMA callbacks" has been added to the 4.4-stable tree To: vgupta@synopsys.com, gregkh@linuxfoundation.org Cc: , From: Date: Mon, 05 Sep 2016 15:36:10 +0200 Message-ID: <14730825701245@kroah.com> MIME-Version: 1.0 Content-Type: text/plain; charset=ANSI_X3.4-1968 Content-Transfer-Encoding: 8bit Sender: stable-owner@vger.kernel.org List-ID: This is a note to let you know that I've just added the patch titled ARC: Elide redundant setup of DMA callbacks to the 4.4-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: arc-elide-redundant-setup-of-dma-callbacks.patch and it can be found in the queue-4.4 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let know about it. >>From 45c3b08a117e2232fc8d7b9e849ead36386f4f96 Mon Sep 17 00:00:00 2001 From: Vineet Gupta Date: Mon, 13 Jun 2016 16:38:27 +0200 Subject: ARC: Elide redundant setup of DMA callbacks 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 @@ -914,6 +914,15 @@ 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; Patches currently in stable-queue which might be from vgupta@synopsys.com are queue-4.4/arc-build-better-way-to-detect-isa-compatible-toolchain.patch queue-4.4/arc-elide-redundant-setup-of-dma-callbacks.patch queue-4.4/arc-call-trace_hardirqs_on-before-enabling-irqs.patch queue-4.4/arc-use-correct-offset-in-pt_regs-for-saving-restoring-user-mode-r25.patch