From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-9.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 81C39C3A5A4 for ; Fri, 23 Aug 2019 11:58:39 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 5D8A522CEC for ; Fri, 23 Aug 2019 11:58:39 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2394370AbfHWL6i (ORCPT ); Fri, 23 Aug 2019 07:58:38 -0400 Received: from foss.arm.com ([217.140.110.172]:33092 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2394343AbfHWL6g (ORCPT ); Fri, 23 Aug 2019 07:58:36 -0400 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 8B6F2337; Fri, 23 Aug 2019 04:58:35 -0700 (PDT) Received: from e120937-lin.cambridge.arm.com (e120937-lin.cambridge.arm.com [10.1.197.50]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 024373F246; Fri, 23 Aug 2019 04:58:33 -0700 (PDT) From: Cristian Marussi To: linux-kernel@vger.kernel.org Cc: linux-arch@vger.kernel.org, linux-arm-kernel@lists.infradead.org, dave.martin@arm.com, james.morse@arm.com, mark.rutland@arm.com, catalin.marinas@arm.com, will@kernel.org, tglx@linutronix.de, peterz@infradead.org, takahiro.akashi@linaro.org, hidehiro.kawai.ez@hitachi.com Subject: [RFC PATCH 7/7] arm64: smp: add arch specific cpu parking helper Date: Fri, 23 Aug 2019 12:57:20 +0100 Message-Id: <20190823115720.605-8-cristian.marussi@arm.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20190823115720.605-1-cristian.marussi@arm.com> References: <20190823115720.605-1-cristian.marussi@arm.com> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Add an arm64 specific helper which parks the cpu in a more architecture efficient way. Signed-off-by: Cristian Marussi --- arch/arm64/kernel/smp.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/arch/arm64/kernel/smp.c b/arch/arm64/kernel/smp.c index c7497a885cfd..a3fb22b4c870 100644 --- a/arch/arm64/kernel/smp.c +++ b/arch/arm64/kernel/smp.c @@ -947,6 +947,12 @@ void tick_broadcast(const struct cpumask *mask) } #endif +void arch_smp_cpu_park(void) +{ + while (1) + cpu_park_loop(); +} + void arch_smp_cpus_stop_complete(void) { sdei_mask_local_cpu(); -- 2.17.1